RESUMEN

A one year feeding trial was conducted on carps i.e. Catla (Cattla cattla), Mrigal (Cirhinus mrigala) and Rohu (Labeo rohita) to find out appropriate level of fishmeal in diet and their effects on growth, survival and biomass in intensive polyculture. Three different inclusions of fishmeal were used in experimental diets (25%, 35% and 45%). Highest average daily growth was observed by 25% fish meal diet (2.18g, 2.19g and 2.34g for catla, rohu and mrigal respectively), whereas 35% fish meal based diet was next by showing 1.63g average daily growth for catla, 1.73g for rohu and 1.67g for mrigal. Mean values of monthly weight again and average daily growth showed significant differences among treatments. Growth was found to be higher in C. mrigala in case of 25% and 45% and L. rohita in case of 35% fish meal. Minimum FCR was obtained by 25% FM based diets as 3.53±0.41 followed by 45% (3.82±0.33) and 35% (4.05±0.45). The findings of this research trial determine the optimum dietary level of fishmeal and its effectiveness as an important ingredient in diets of Indian major carps. It is proved that a feed by the combination of animal and plant protein is much preferable by carps as compare to a feed with higher concentration of fish meal.

Um teste de alimentação de um ano foi realizado em carpas, ou seja, Catla (Cattla cattla), Mrigal (Cirhinus mrigala) e Rohu (Labeo rohita) para descobrir o nível adequado de farinha de peixe na dieta e seus efeitos no crescimento, sobrevivência e biomassa em policultura intensiva. Três diferentes inclusões de farinha de peixe foram utilizadas nas dietas experimentais (25%, 35% e 45%). O maior crescimento médio diário foi observado pela dieta com 25% de farinha de peixe (2,18g, 2,19g e 2,34g para catla, rohu e mrigal, respectivamente), enquanto a dieta à base de farinha de peixe de 35% foi a próxima, mostrando um crescimento médio diário de 1,63g para catla, 1,73g para rohu e 1,67g para mrigal. Os valores médios de peso mensal novamente e crescimento médio diário apresentaram diferenças significativas entre os tratamentos. O crescimento foi maior em C. mrigala no caso de 25% e 45% e L. Rohita, no caso de 35% de farinha de peixe. A TCA mínima foi obtida por dietas à base de 25% FM como 3,53 ± 0,41 seguido por 45% (3,82 ± 0,33) e 35% (4,05 ± 0,45). Os resultados desta pesquisa determinam o nível ideal de farinha de peixe e sua eficácia como um ingrediente importante nas dietas das principais carpas indianas. Assim, demonstrando que uma ração com combinação de proteína animal e vegetal é preferível para as carpas do que uma ração com maior concentração de farinha de peixe.

Asunto(s)

RESUMEN

Fishmeal; being a limited and costly feed ingredient is continuously been substituted with locally available plant proteins. However, the occurrence of anti-nutritional factors in plant meal suppresses its potential to be fully replaced. Therefore, in this study we aimed to study the synergistic effects of dietary additives like citric acid and phytase enzyme supplementation on growth performance and nutrient digestibility of Cirrhinus mrigala fingerlings. Canola meal (CM) was used as a test ingredient to replace fishmeal (FM) as; 0%, 25%, 50% and 75%. These four diets were further supplemented by varying levels of phytase (0 and 750 FTU kg-1) and citric acid (0% and 2.5%) to formulate total sixteen test diets as T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15 and T16. Each treatment contained three replicates; applied to fish groups having 15 fingerlings each; following 3×3 factorial arrangement. 1% of chromic oxide was added as an inert marker. Maximum weight gain% (288%) and the lowest value of FCR (1.07) were recorded when fish was fed on diet T12 as compared to fish fed control diet (T1). Similarly, optimum nutrient digestibility values such as crude protein (77%), crude fat (84%) and gross energy (70%) were noted on same level. It was concluded that 50% canola meal can optimally replace fishmeal when supplemented with phytase and citric acid at the levels of 750 FTU kg-¹ and 2.5%, respectively.(AU)

A farinha de peixe, por ser um ingrediente alimentar limitado e caro, é continuamente substituída por proteínas vegetais disponíveis localmente. No entanto, a ocorrência de fatores antinutricionais na farinha de plantas suprime seu potencial de ser totalmente substituída. Portanto, neste estudo objetivamos estudar os efeitos sinérgicos de aditivos dietéticos como ácido cítrico e suplementação com enzima fitase sobre o desempenho de crescimento e digestibilidade de nutrientes de alevinos de Cirrhinus mrigala. A farinha de canola (CM) foi usada como ingrediente de teste para substituir a farinha de peixe (FM) como: 0%, 25%, 50% e 75%. Essas quatro dietas foram suplementadas por níveis variados de fitase (0 e 750 FTU kg-1) e ácido cítrico (0% e 2,5%) para formular um total de 16 dietas de teste como T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15 e T16. Cada tratamento continha três repetições; aplicado a grupos de peixes com 15 alevinos cada; seguindo o arranjo fatorial 3 × 3. 1% de óxido crômico foi adicionado como um marcador inerte. % de ganho de peso máximo (288%) e o valor mais baixo de FCR (1,07) foram registrados quando os peixes foram alimentados com dieta T12 em comparação com peixes alimentados com dieta controle (T1). Da mesma forma, valores ótimos de digestibilidade de nutrientes, como proteína bruta (77%), gordura bruta (84%) e energia bruta (70%) foram anotados no mesmo nível. Concluiu-se que 50% da farinha de canola pode substituir de forma ideal a farinha de peixe quando suplementada com fitase e ácido cítrico nos níveis de 750 FTU kg-¹ e 2,5%, respectivamente.(AU)

Asunto(s)

RESUMEN

Abstract Fishmeal; being a limited and costly feed ingredient is continuously been substituted with locally available plant proteins. However, the occurrence of anti-nutritional factors in plant meal suppresses its potential to be fully replaced. Therefore, in this study we aimed to study the synergistic effects of dietary additives like citric acid and phytase enzyme supplementation on growth performance and nutrient digestibility of Cirrhinus mrigala fingerlings. Canola meal (CM) was used as a test ingredient to replace fishmeal (FM) as; 0%, 25%, 50% and 75%. These four diets were further supplemented by varying levels of phytase (0 and 750 FTU kg-1) and citric acid (0% and 2.5%) to formulate total sixteen test diets as T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15 and T16. Each treatment contained three replicates; applied to fish groups having 15 fingerlings each; following 3×3 factorial arrangement. 1% of chromic oxide was added as an inert marker. Maximum weight gain% (288%) and the lowest value of FCR (1.07) were recorded when fish was fed on diet T12 as compared to fish fed control diet (T1). Similarly, optimum nutrient digestibility values such as crude protein (77%), crude fat (84%) and gross energy (70%) were noted on same level. It was concluded that 50% canola meal can optimally replace fishmeal when supplemented with phytase and citric acid at the levels of 750 FTU kg-1 and 2.5%, respectively.

Resumo A farinha de peixe, por ser um ingrediente alimentar limitado e caro, é continuamente substituída por proteínas vegetais disponíveis localmente. No entanto, a ocorrência de fatores antinutricionais na farinha de plantas suprime seu potencial de ser totalmente substituída. Portanto, neste estudo objetivamos estudar os efeitos sinérgicos de aditivos dietéticos como ácido cítrico e suplementação com enzima fitase sobre o desempenho de crescimento e digestibilidade de nutrientes de alevinos de Cirrhinus mrigala. A farinha de canola (CM) foi usada como ingrediente de teste para substituir a farinha de peixe (FM) como: 0%, 25%, 50% e 75%. Essas quatro dietas foram suplementadas por níveis variados de fitase (0 e 750 FTU kg-1) e ácido cítrico (0% e 2,5%) para formular um total de 16 dietas de teste como T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15 e T16. Cada tratamento continha três repetições; aplicado a grupos de peixes com 15 alevinos cada; seguindo o arranjo fatorial 3 × 3. 1% de óxido crômico foi adicionado como um marcador inerte. % de ganho de peso máximo (288%) e o valor mais baixo de FCR (1,07) foram registrados quando os peixes foram alimentados com dieta T12 em comparação com peixes alimentados com dieta controle (T1). Da mesma forma, valores ótimos de digestibilidade de nutrientes, como proteína bruta (77%), gordura bruta (84%) e energia bruta (70%) foram anotados no mesmo nível. Concluiu-se que 50% da farinha de canola pode substituir de forma ideal a farinha de peixe quando suplementada com fitase e ácido cítrico nos níveis de 750 FTU kg-1 e 2,5%, respectivamente.

Asunto(s)

RESUMEN

Fishmeal; being a limited and costly feed ingredient is continuously been substituted with locally available plant proteins. However, the occurrence of anti-nutritional factors in plant meal suppresses its potential to be fully replaced. Therefore, in this study we aimed to study the synergistic effects of dietary additives like citric acid and phytase enzyme supplementation on growth performance and nutrient digestibility of Cirrhinus mrigala fingerlings. Canola meal (CM) was used as a test ingredient to replace fishmeal (FM) as; 0%, 25%, 50% and 75%. These four diets were further supplemented by varying levels of phytase (0 and 750 FTU kg-1) and citric acid (0% and 2.5%) to formulate total sixteen test diets as T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15 and T16. Each treatment contained three replicates; applied to fish groups having 15 fingerlings each; following 3×3 factorial arrangement. 1% of chromic oxide was added as an inert marker. Maximum weight gain% (288%) and the lowest value of FCR (1.07) were recorded when fish was fed on diet T12 as compared to fish fed control diet (T1). Similarly, optimum nutrient digestibility values such as crude protein (77%), crude fat (84%) and gross energy (70%) were noted on same level. It was concluded that 50% canola meal can optimally replace fishmeal when supplemented with phytase and citric acid at the levels of 750 FTU kg-¹ and 2.5%, respectively.

A farinha de peixe, por ser um ingrediente alimentar limitado e caro, é continuamente substituída por proteínas vegetais disponíveis localmente. No entanto, a ocorrência de fatores antinutricionais na farinha de plantas suprime seu potencial de ser totalmente substituída. Portanto, neste estudo objetivamos estudar os efeitos sinérgicos de aditivos dietéticos como ácido cítrico e suplementação com enzima fitase sobre o desempenho de crescimento e digestibilidade de nutrientes de alevinos de Cirrhinus mrigala. A farinha de canola (CM) foi usada como ingrediente de teste para substituir a farinha de peixe (FM) como: 0%, 25%, 50% e 75%. Essas quatro dietas foram suplementadas por níveis variados de fitase (0 e 750 FTU kg-1) e ácido cítrico (0% e 2,5%) para formular um total de 16 dietas de teste como T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15 e T16. Cada tratamento continha três repetições; aplicado a grupos de peixes com 15 alevinos cada; seguindo o arranjo fatorial 3 × 3. 1% de óxido crômico foi adicionado como um marcador inerte. % de ganho de peso máximo (288%) e o valor mais baixo de FCR (1,07) foram registrados quando os peixes foram alimentados com dieta T12 em comparação com peixes alimentados com dieta controle (T1). Da mesma forma, valores ótimos de digestibilidade de nutrientes, como proteína bruta (77%), gordura bruta (84%) e energia bruta (70%) foram anotados no mesmo nível. Concluiu-se que 50% da farinha de canola pode substituir de forma ideal a farinha de peixe quando suplementada com fitase e ácido cítrico nos níveis de 750 FTU kg-¹ e 2,5%, respectivamente.

Asunto(s)

RESUMEN

Abstract Fishmeal; being a limited and costly feed ingredient is continuously been substituted with locally available plant proteins. However, the occurrence of anti-nutritional factors in plant meal suppresses its potential to be fully replaced. Therefore, in this study we aimed to study the synergistic effects of dietary additives like citric acid and phytase enzyme supplementation on growth performance and nutrient digestibility of Cirrhinus mrigala fingerlings. Canola meal (CM) was used as a test ingredient to replace fishmeal (FM) as; 0%, 25%, 50% and 75%. These four diets were further supplemented by varying levels of phytase (0 and 750 FTU kg-1) and citric acid (0% and 2.5%) to formulate total sixteen test diets as T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15 and T16. Each treatment contained three replicates; applied to fish groups having 15 fingerlings each; following 3×3 factorial arrangement. 1% of chromic oxide was added as an inert marker. Maximum weight gain% (288%) and the lowest value of FCR (1.07) were recorded when fish was fed on diet T12 as compared to fish fed control diet (T1). Similarly, optimum nutrient digestibility values such as crude protein (77%), crude fat (84%) and gross energy (70%) were noted on same level. It was concluded that 50% canola meal can optimally replace fishmeal when supplemented with phytase and citric acid at the levels of 750 FTU kg-1 and 2.5%, respectively.

Resumo A farinha de peixe, por ser um ingrediente alimentar limitado e caro, é continuamente substituída por proteínas vegetais disponíveis localmente. No entanto, a ocorrência de fatores antinutricionais na farinha de plantas suprime seu potencial de ser totalmente substituída. Portanto, neste estudo objetivamos estudar os efeitos sinérgicos de aditivos dietéticos como ácido cítrico e suplementação com enzima fitase sobre o desempenho de crescimento e digestibilidade de nutrientes de alevinos de Cirrhinus mrigala. A farinha de canola (CM) foi usada como ingrediente de teste para substituir a farinha de peixe (FM) como: 0%, 25%, 50% e 75%. Essas quatro dietas foram suplementadas por níveis variados de fitase (0 e 750 FTU kg-1) e ácido cítrico (0% e 2,5%) para formular um total de 16 dietas de teste como T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15 e T16. Cada tratamento continha três repetições; aplicado a grupos de peixes com 15 alevinos cada; seguindo o arranjo fatorial 3 × 3. 1% de óxido crômico foi adicionado como um marcador inerte. % de ganho de peso máximo (288%) e o valor mais baixo de FCR (1,07) foram registrados quando os peixes foram alimentados com dieta T12 em comparação com peixes alimentados com dieta controle (T1). Da mesma forma, valores ótimos de digestibilidade de nutrientes, como proteína bruta (77%), gordura bruta (84%) e energia bruta (70%) foram anotados no mesmo nível. Concluiu-se que 50% da farinha de canola pode substituir de forma ideal a farinha de peixe quando suplementada com fitase e ácido cítrico nos níveis de 750 FTU kg-1 e 2,5%, respectivamente.

RESUMEN

The black soldier fly, Hermetia illucens (BSF, Diptera: Stratiomyidae) is an insect with high protein value and a potential feed agent for animals aimed for human consumption. The growth parameters of BSF larvae reared on four substrates-restaurant-waste, fruit-waste, fish-waste, and commercial tilapia food-for 41 days before processing for inclusion into Oreochromis niloticus (Perciformes: Cichlidae, Nile tilapia) commercial fry diets at 30% (70:30) were determined. On fly larvae, the food substrate based on restaurant waste yielded the greatest larval weight and length. BSF larvae fed a fish-waste diet showed the shortest developmental time. The fruit-waste diet induced the lowest weight and length in the fly larvae/pre-pupae (immature stage). The pre-pupal protein values were similar to commercial food. On fry-fish, the diets with pre-pupae grown on fish waste showed the greatest yields regarding weight (biomass), length, and nutritional content. These results suggest the BSF has the potential to be used in fish feed and provides an alternative for commercial cultivation.

RESUMEN

An 8-week feeding trial investigated the effect of Fishmeal (FM) replacement by soybean meal (SBM) and poultry by-product meal (PBM) in diets supplemented with DL-Met, MET-MET (AQUAVI®), Bacillus amyloliquefaciens CECT 5940 (ECOBIOL®) and their combinations on growth performance and health of juvenile Litopenaeus vannamei. A total of six experimental diets were formulated according to L. vannamei nutritional requirements. A total of 480 shrimp (0.30 ± 0.04 g) were randomly distributed into 24 tanks (4 repetitions/each diet, 20 shrimp/tank). Shrimp were fed with control diet (CD; 200 g/Kg fishmeal) and five diets with 50% FM replacement supplemented with different methionine sources, probiotic (B. amyloliquefaciens CECT 5940) and their combinations: D1 (0.13% DL-MET), D2 (0.06% MET-MET), D3 (0.19% MET-MET), D4 (0.13% DL-MET plus 0.10% B. amyloliquefaciens CECT 5940 and D5 (0.06% MET-MET plus 0.10% B. amyloliquefaciens CECT 5940). Shrimp fed D3 and D5 had significantly higher final, weekly weight gain, and final biomass compared to shrimp fed CD (p < 0.05). Shrimp fed D2 to D5 increased the hepatopancreas epithelial cell height (p < 0.05). Digestive enzymatic activities were significantly increased in shrimp hepatopancreas' fed D3 (p < 0.05). Meanwhile, shrimp fed D1 had significant downregulation of immune-related genes (p < 0.05). Moreover, shrimp fed D3 and D5 increased the abundance of beneficial prokaryotic microorganisms such as Pseudoalteromonas and Demequina related to carbohydrate metabolism and immune stimulation. Also, shrimp fed D3 and D5 increased the abundance of beneficial eukaryotic microorganism as Aurantiochytrium and Aplanochytrium were related to eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) production which plays a role in growth promoting or boosting the immunity of aquatic organisms. Therefore, fishmeal could be partially substituted up to 50% by SBM and PBM in diets supplemented with 0.19% MET-MET (AQUAVI®) or 0.06% MET-MET (AQUAVI®) plus 0.10% B. amyloliquefaciens CECT 5940 (ECOBIOL®) and improve the productive performance, health, and immunity of white shrimp. Further research is necessary to investigate synergistic effects of amino acids and probiotics in farmed shrimp diets, as well as to evaluate how SBM and PBM influence the fatty acid composition of reduced fishmeal diets and shrimp muscle quality. Nevertheless, this information could be interesting to develop low fishmeal feeds for aquaculture without affecting the growth and welfare of aquatic organisms.

RESUMEN

The black soldier fly (BSF) Hermetia illucens is receiving increasing attention as a sustainable fishmeal alternative protein source for aquaculture. To date, no studies have explored the effects of fishmeal replacement with BSF V instar larvae or prepupae meals due to their peculiar nutritional properties on fish performances. This study investigated the effects of 100% replacement of fishmeal (control diet) with defatted BSF meals (V instar larvae and prepupae meals, treatments) on growth performance and welfare of zebrafish (Danio rerio), from larvae to adults, in a 60-day feeding trial. Following the inclusion of BSF meals, the expression of key genes involved in growth (igf1, igf2, mstnb, myod1, myog, myf5), hydrolysis of chitin (chia.2, chia.3, chia.5), immune- (il1b, il6, tnfα), and stress- (hsp70 and nr3c1) responses, as assessed by qPCR, was modulated in all of the molecular pathways, except for the stress response. Overall, our findings showed that both BSF meals can totally replace fishmeal without adverse impacts on adult zebrafish growth parameters (final total and standard length, final body weight, weight gain, daily growth rate, specific growth rate) and welfare, with BSF prepupae meal inducing the most beneficial effects, thus suggesting their potential application to meet fish requirements in aquaculture.

RESUMEN

Host genetics and diet can exert an influence on microbiota and, therefore, on feeding efficiency. This study evaluated the effect of genetic line (fast-growth and high-resistance) in Pacific white shrimp (Litopenaeus vannamei) on the hepatopancreatic microbiota and its association with the feeding efficiency in shrimp fed with diets containing different protein sources. Shrimp (2.08 ± 0.06 g) from each genetic line were fed for 36 days with two dietary treatments (animal and vegetable protein). Each of the four groups was sampled, and the hepatopancreatic metagenome was amplified using specific primers for the variable V4 region of the 16S rRNA gene. The PCR product was sequenced on the MiSeq platform. Nineteen bacterial phyla were detected, of which Proteobacteria was the most abundant (51.0 72.5 %), Bacteroidetes (3.6 23.3 %), Firmicutes (4.2 13.7 %), Actinobacteria (1.9 12.1 %), and Planctomycetes (1.3 9.5 %). Diet was the most influential factor in the taxonomic composition of the microbiota, while genetic line was not a strong influential factor. The results suggest that the taxonomic profile of the bacteria colonizing shrimp hepatopancreas was determined by the diet consumed, similar to what occurs in the intestine. Shrimp in the fast-growth line had greater feeding efficiency regardless of the diet supplied. Finally, the results suggest that Proteobacteria influenced (p < 0.05) the feeding efficiency of shrimp fed with a vegetable diet. Nevertheless, further studies are required to explore how shrimp genetic linediet interaction influences microbiota for probiotic development and functional food formulation for farmed shrimp according to the genetic line.

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Host genetics and diet can exert an influence on microbiota and, therefore, on feeding efficiency. This study evaluated the effect of genetic line (fast-growth and high-resistance) in Pacific white shrimp (Litopenaeus vannamei) on the hepatopancreatic microbiota and its association with the feeding efficiency in shrimp fed with diets containing different protein sources. Shrimp (2.08 ± 0.06 g) from each genetic line were fed for 36 days with two dietary treatments (animal and vegetable protein). Each of the four groups was sampled, and the hepatopancreatic metagenome was amplified using specific primers for the variable V4 region of the 16S rRNA gene. The PCR product was sequenced on the MiSeq platform. Nineteen bacterial phyla were detected, of which Proteobacteria was the most abundant (51.0 72.5 %), Bacteroidetes (3.6 23.3 %), Firmicutes (4.2 13.7 %), Actinobacteria (1.9 12.1 %), and Planctomycetes (1.3 9.5 %). Diet was the most influential factor in the taxonomic composition of the microbiota, while genetic line was not a strong influential factor. The results suggest that the taxonomic profile of the bacteria colonizing shrimp hepatopancreas was determined by the diet consumed, similar to what occurs in the intestine. Shrimp in the fast-growth line had greater feeding efficiency regardless of the diet supplied. Finally, the results suggest that Proteobacteria influenced (p < 0.05) the feeding efficiency of shrimp fed with a vegetable diet. Nevertheless, further studies are required to explore how shrimp genetic linediet interaction influences microbiota for probiotic development and functional food formulation for farmed shrimp according to the genetic line.(AU)

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En esta investigación documental se presentan alternativas viables para utilizar cabezas de pescado, subproductos de la acuicultura, para elaborar harina que sirva como materia prima para la fortificación de productos alimenticios nutritivos. La harina de cabeza de pescado propuesta en esta investigación puede ser integrada exitosamente a alimentos para consumo humano, y usadas en las proporciones adecuadas no causa interferencias en las propiedades sensoriales de los productos formulados. Para masificar la producción de los alimentos fortificados con harina de cabeza de pescado propuestos en este estudio, es indispensable practicarle además una serie de pruebas denominadas "vida de anaquel".

In this documentary research, viable alternatives are presented to use fish heads, by-products of aquaculture, to make flour that serve as raw material for the fortification of nutritious food products. The fish head meal proposed in this research can be successfully integrated into food for human consumption, and used in the appropriate proportions does not cause interference in the sensory properties of the formulated products. To massify the production of foods fortified with fish head meal proposed in this study, it is essential to also perform a series of tests called "shelf life".

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For some fish species, dietary taurine supplementation has been proven necessary in feeds with considerable utilization of vegetable proteins to substitute fishmeal. Pirarucu, Arapaima gigas feeds mainly on taurine-rich animal items in nature, therefore this study aimed to evaluate the effect of dietary taurine supplementation (0, 0.5, 1, 1.5 and 3%) on the growth and blood physiological parameters of juvenile pirarucu. A commercial feed was utilized as the basal diet for the experimental diets. Three hundred fish (20.8 ± 2.3 g) were randomly distributed in 15 tanks and fed for 28 days. At the end of the trial, dietary taurine supplementation did not affect fish growth, feed consumption and feed efficiency. The original amounts of taurine (0.18%) and methionine (1.13%) in the commercial feed (0% taurine diet) apparently sufficed to promote adequate pirarucu growth, with no variation noted in the main blood physiological parameters. Further studies to assess whether taurine is conditionally essential for the pirarucu fed methionine-deficient diets are needed to elucidate the functionality of this nutrient for the studied species.(AU)

Para algumas espécies de peixe, a suplementação de taurina na dieta tem-se mostrado necessária em dietas com grande utilização de proteínas vegetais em substituição à farinha de peixe. Na natureza, o pirarucu, Arapaima gigas se alimenta de itens animais ricos em taurina, portanto este estudo avaliou o efeito da suplementação de taurina (0; 0,5; 1; 1,5 e 3%) sobre o crescimento e parâmetros fisiológicos sanguíneos de juvenis da espécie. Uma ração comercial foi utilizada como dieta basal para as dietas experimentais. Trezentos peixes (20,8 ± 2,3 g) foram aleatoriamente distribuídos em 15 tanques e alimentados durante 28 dias. Ao final do ensaio, a suplementação de taurina nas dietas não afetou crescimento, consumo de alimento e eficiência alimentar dos peixes. As quantidades iniciais de taurina (0,18%) e metionina (1,13%) da ração comercial (dieta 0% taurina) foram aparentemente suficientes para promover o crescimento adequado do pirarucu sem alteração dos principais parâmetros fisiológicos do sangue. Futuros estudos que avaliem se a taurina é condicionalmente essencial para pirarucu alimentado com dietas deficientes em metionina são necessários para elucidar a funcionalidade deste nutriente para a espécie.(AU)

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The presence of polychlorinated biphenyls (PCBs) in feed materials has caused great public concern because PCBs can accumulate in farmed animals, be transferred farm-to-fork and, ultimately, have a detrimental impact on human health. Recently, the occurrence of PCBs in marine environments has garnered scientific attention due to their high levels and potential reproductive threats to marine apex predators. Fishmeal is marine-origin feed material and is susceptible to PCB contamination from the aquatic trophic chain. The present study collected 102 fishmeal samples during 2012-2017 from major global fishmeal production areas (United States, Europe, China, South America and Southeast Asia). The levels of PCBs (26 congeners) were between 0.4 and 19.9 ng g-1 dw (mean: 1.94 ng g-1 dw), with a 75.3% contribution from indicator PCBs on a weight basis. Together with PCDD/Fs, 4.9% of fishmeal exceeded the maximum levels set by the European Commission for dioxin-like compounds (4.0 pg WHO-TEQ/g). The highest PCB levels were found in fishmeal from the U.S. (6.85 ng g-1 dw), which was nearly five times higher than the other four sampling areas. No clear time trends were found for PCBs in fishmeal during the sampling period. Predicted PCB concentrations in farmed fish via fishmeal consumption were between 1.24 and 2.76 ng g-1 dw, which was comparable to PCBs in market fish. When compared to other emerging POPs in the same batches of fishmeal, PCBs were still found to be an alarming class of POPs. Some PCB and PBDE congeners might have similar sources and environmental behaviors.

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Este trabalho teve como objetivo avaliar o efeito da substituição da farinha e do óleo de peixe pelo concentrado proteico de soja e óleo de soja, na sobrevivência, no crescimento e na composição corporal dos camarões (Litopenaeus vannamei) produzidos em sistema de bioflocos (BFT). Foram formuladas cinco dietas, isoproteicas e isoenergéticas, com diferentes níveis de substituição da farinha e do óleo de peixe por concentrado proteico de soja e óleo de soja, sendo os tratamentos designados como: 0% (sem substituição), 25%, 50%, 75% e 100%. As rações foram elaboradas para conter aproximadamente 35% de proteína e 8% de lipídios. O experimento foi conduzido durante 49 dias, com juvenis com peso inicial de 2,93±0,83g, em sistema de bioflocos (BFT). Não foram encontradas diferenças significativas entre os tratamentos até 75% de substituição para as variáveis de ganho de peso, conversão alimentar e sobrevivência. O tratamento de 100% de substituição apresentou menor taxa de crescimento específico. O presente resultado sugere que, nas dietas para camarões criados em sistema bioflocos, a farinha e o óleo de peixe possam ser substituídos em até 75% por concentrado proteico de soja e óleo de soja, sem prejudicar o desenvolvimento dos animais.(AU)

The objective of this work was to evaluate the effect of the substitution of fishmeal and fish oil with soy protein concentrate and soybean oil on survival, growth and body composition of shrimp (Litopenaeus vannamei) produced in biofloc system (BFT). Five diets were formulated to be isoproteic and isoenergetic with different levels of substitution of fishmeal and fish oil with soy protein concentrate and soybean oil. The treatments were named as: 0% (without substitution), 25%, 50%, 75% and 100%. The diets were formulated to contain approximately 35% protein and 8% lipids. The experiment was conducted for 49 days, with juveniles with initial weight of (2.93±0.83g) in a biofloc system (BFT). No significant differences were found between treatments up to 75% of substitution for the variables of weight gain, feed conversion ratio, and survival. The 100% substitution treatment showed a lower specific growth rate. The present study suggests fish meal and fish oil can be substituted in up to 75% for soy protein concentrate and soybean oil, without harming the development of the shrimps when reared in biofloc system.(AU)

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Este trabalho teve como objetivo avaliar o efeito da substituição da farinha e do óleo de peixe pelo concentrado proteico de soja e óleo de soja, na sobrevivência, no crescimento e na composição corporal dos camarões (Litopenaeus vannamei) produzidos em sistema de bioflocos (BFT). Foram formuladas cinco dietas, isoproteicas e isoenergéticas, com diferentes níveis de substituição da farinha e do óleo de peixe por concentrado proteico de soja e óleo de soja, sendo os tratamentos designados como: 0% (sem substituição), 25%, 50%, 75% e 100%. As rações foram elaboradas para conter aproximadamente 35% de proteína e 8% de lipídios. O experimento foi conduzido durante 49 dias, com juvenis com peso inicial de 2,93±0,83g, em sistema de bioflocos (BFT). Não foram encontradas diferenças significativas entre os tratamentos até 75% de substituição para as variáveis de ganho de peso, conversão alimentar e sobrevivência. O tratamento de 100% de substituição apresentou menor taxa de crescimento específico. O presente resultado sugere que, nas dietas para camarões criados em sistema bioflocos, a farinha e o óleo de peixe possam ser substituídos em até 75% por concentrado proteico de soja e óleo de soja, sem prejudicar o desenvolvimento dos animais.(AU)

The objective of this work was to evaluate the effect of the substitution of fishmeal and fish oil with soy protein concentrate and soybean oil on survival, growth and body composition of shrimp (Litopenaeus vannamei) produced in biofloc system (BFT). Five diets were formulated to be isoproteic and isoenergetic with different levels of substitution of fishmeal and fish oil with soy protein concentrate and soybean oil. The treatments were named as: 0% (without substitution), 25%, 50%, 75% and 100%. The diets were formulated to contain approximately 35% protein and 8% lipids. The experiment was conducted for 49 days, with juveniles with initial weight of (2.93±0.83g) in a biofloc system (BFT). No significant differences were found between treatments up to 75% of substitution for the variables of weight gain, feed conversion ratio, and survival. The 100% substitution treatment showed a lower specific growth rate. The present study suggests fish meal and fish oil can be substituted in up to 75% for soy protein concentrate and soybean oil, without harming the development of the shrimps when reared in biofloc system.(AU)

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Novel brominated flame retardants (NBFRs), which are lipophilic compounds that have been widely applied after the phasing-out of legacy BFRs, can bioaccumulate through the food chain. However, information on NBFRs in animal feeds, the beginning of farm-to-fork pathway, is very limited. Fishmeal is one of the most widely applied feedstuff worldwide. The present study identified eleven NBFRs from ninety-two globally collected fishmeal samples with levels in the range of 0.13-822 (mean: 15.1 ±â€¯85.5) ng/g lipid weight (lw). Hexabromobenzene (HBB) and pentabromotoluene (PBT) were the most prevalent contributors (detection frequencies: 95.7% and 73.9%, respectively), and decabromodiphenylethane (DBDPE) was the weightiest contributor (accounted for 67.1% of the ΣNBFRs, mean: 12.1 ±â€¯84.8 ng/g lw). From a geographical view, the highest NBFR level was found in Chinese fishmeal. The NBFRs fell within an order of magnitude in South America, Southeast Asia, Europe and United States. DBDPE was predominant in the fishmeal collected from China, South America and United States, but it was not detected in European fishmeal. The NBFR levels are significantly lower compared to the polybrominated diphenyl ethers (PBDEs) (p < 0.01), indicating that the distribution of NBFRs was not as wide as PBDEs in fishmeal. DBDPE was significantly correlated with BDE209 (r = 0.557, p < 0.01), which implies that the two chemicals might have similar sources. Quantitative structure-activity relationship (QSAR)results imply that the NBFRs might have similar persistence and biomagnification potential as legacy lipophilic POPs.

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Several microalgae contain in excess of 50 % crude protein with amino acid profile comparable to that of fish meal. In addition, high polyunsaturated fatty acid contents encourage their use in animal feeding and nutrition, particularly in the formulation and processing of aquafeeds. This study aims at estimating the feasibility of Chlorella meal as feed ingredient for the feeding and nutrition of farmed tilapia based upon digestibility data. Juvenile tilapia were stocked in conical-bottomed tanks (200 L) with superficial, continuous water flow, and fed to apparent satiation in three daily meals with a reference diet and a test diet containing 30 % lyophilized Chlorella sorokiniana added of an inert marker. Feces were collected overnight by sedimentation in refrigerated, plastic containers coupled to the tanks and analyzed for determination of chemical composition and inert marker contents to estimate apparent digestibility coefficients (ADCs) of protein and energy of Chlorella meal; registered ADCs of Chlorella meal were 90.5 and 84.22, respectively. A pricing model considering the quantity of digestible nutrient was proposed based on ADCs of Chlorella and compared with the price of fishmeal (FM) and soybean meal (SBM). The indicative prices to elicit the use of Chlorella as a protein source rather than FM or SBM for the feed and nutrition of tilapia were 2.65 USD kg−1 and 0.66 USD kg−1, respectively.

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Several microalgae contain in excess of 50 % crude protein with amino acid profile comparable to that of fish meal. In addition, high polyunsaturated fatty acid contents encourage their use in animal feeding and nutrition, particularly in the formulation and processing of aquafeeds. This study aims at estimating the feasibility of Chlorella meal as feed ingredient for the feeding and nutrition of farmed tilapia based upon digestibility data. Juvenile tilapia were stocked in conical-bottomed tanks (200 L) with superficial, continuous water flow, and fed to apparent satiation in three daily meals with a reference diet and a test diet containing 30 % lyophilized Chlorella sorokiniana added of an inert marker. Feces were collected overnight by sedimentation in refrigerated, plastic containers coupled to the tanks and analyzed for determination of chemical composition and inert marker contents to estimate apparent digestibility coefficients (ADCs) of protein and energy of Chlorella meal; registered ADCs of Chlorella meal were 90.5 and 84.22, respectively. A pricing model considering the quantity of digestible nutrient was proposed based on ADCs of Chlorella and compared with the price of fishmeal (FM) and soybean meal (SBM). The indicative prices to elicit the use of Chlorella as a protein source rather than FM or SBM for the feed and nutrition of tilapia were 2.65 USD kg−1 and 0.66 USD kg−1, respectively.(AU)

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Due to inconsistency in demand and supply of fishmeal there is immense need of alternate protein sources. Present project was therefore designed to replace costly fishmeal (FM) with low-priced fermented fish silage (FFS) in fish feed. Fermented fish silage was prepared by fermentation process using Lacto bacillus bacteria and its fatty acid profile and effect on digestive system of Labeo rohita was investigated. Lipid contents were isolated by Soxhlet apparatus and recorded as 6.23 ± 1.23 g/100g of fermented fish silage (FFS). Fatty acid profile of extracted Lipids was determined by gas liquid chromatography (GLC), sufficient amount of unsaturated fatty acids were found with pattern mono unsaturated fatty acids (MUFA) > saturated fatty acids (SFA) >poly unsaturated fatty acids (PUFA). Three treatment diets containing 100% silage (T1), 75% silage (T2) and 50% silage (T3) were prepared by mixing it with soybean meal (SBM) and rice bran as co-ingredients while fermented fish silage was replaced by fishmeal in control diet (T0). The experiment was conducted in glass aquaria in triplicate. Fish growth parameters were recorded fortnightly while physicochemical parameters of water were recorded on daily basis. After completion of feeding trial, three fish were randomly dissected to excise out their intestines and determine activity for protease, amylase and lipase enzymes. Non-significant differences (P<0.05) were recorded in growth parameters and enzymatic activity among all diets except lipase enzyme. Deceptively, it can be concluded that FFS has reasonable concentration of nutrients and unsaturated fatty acids so it can successfully replace fishmeal in fish diets.

Devido à diferença na procura e na oferta de farinha de peixe há imensa necessidade de qualquer membro suplente da fonte de proteína. Tão presente projeto foi projetada para substituir a dispendiosa farinha de peixe (FM) com barato peixe fermentado de ensilagem (FFS) em alimentos para peixes. FFS foi preparado pelo processo de fermentação usando Lactobacillus bactérias e seu perfil de ácidos graxos e efeito sobre o sistema digestivo de Labeo rohita foi investigado. Conteúdo lipídico foram isoladas pelo aparelho de Soxhlet e registadas como 6,23 ± 1,23 g/100g de FFS. Perfil de ácidos graxos extraídos de lipídios foi determinada por cromatografia líquida de gás (GLC). Quantidade suficiente de ácidos graxos insaturados foram encontrados com padrão MUFA > SFA > AGPI. Tratamento de três dietas contendo silagem de 100% (T1), 75% silagem (T2) e 50% silagem (T3) foram preparados misturando com farinha de soja (SBM) e farelo de arroz como co ingredientes enquanto FFS foi substituído pela FM na dieta controle (T0). O experimento foi conduzido em aquários de vidro em triplicado. O Crescimento dos peixes foram anotados os parâmetros quinzenal enquanto parâmetros físico-químicos de água foram registradas diariamente. Após a conclusão do teste de alimentação, três peixes foram aleatoriamente dissecada a impostos especiais de consumo os seus intestinos e determinar a atividade de protease, enzimas amilase e lipase. As variações não significativas (P<0,05) foi registrada em parâmetros de crescimento e atividade enzimática entre as dietas exceto enzima lipase mostrou diferença significativa entre as dietas de tratamento. Aparentemente, é possível concluir que a concentração razoável de FFS tem nutrientes e ácidos graxos insaturados de modo que ela possa substituir com êxito a farinha de peixe na dieta de peixes.

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Soy protein concentrate (SPC) was evaluated as a dietary replacement of animal protein sources (fish meal and poultry by-product meal) (APS) for juvenile Nile tilapia (Oreochromis niloticus). Apparent digestibility coefficients (ADC) of crude protein (CP) and dry matter (DM) were evaluated by feeding tilapia an experimental diet composed of 69.5% reference diet, 30% SPC, and 0.5% chromic oxide as inert marker. Apparent digestibility coefficients were 96.57% for CP and 76.84% for DM. In a feeding trial, increasing levels of dietary SPC (0, 33, 67, and 100%) replaced APS and were fed to tilapia juveniles (10.0 ± 0.18 g) for 60 days. Daily weight gain, specific growth rate, protein retention, feed conversion, body composition and liver histology were not significantly (P>0.05) affected by protein replacement. A second feeding trial compared tilapias growth performance when SPC was supplemented with methionine and threonine (100% SPC+aa, 100% SPC, and 0% SPC) as well as CP and DM digestibility. The amino acid supplementation of SPC significantly increased tilapia daily weight gain. Diets containing 100%SPC and 100% SPC+aa promoted higher protein ADC values than diet containing only APS. However, DM ADC values were significantly higher in fish fed 0% SPC when compared to 100% SPC. Therefore, SPC canreplace poultry by-product meal and fish meal in diets for Nile tilapia without compromising growth performance, protein retention, body composition, liver histology, and protein digestibility. However, SPC supplementation with limiting amino acids, such as methionine and threonine, is advisable since it further increases weight gain and protein digestibility.

Concentrado proteico de soja (CPS) foi avaliado como substituto dietético das farinhas de peixe e vísceras de aves (FP e FVA) para juvenis de tilápia do Nilo (Oreochromis niloticus). Os coeficientes de digestibilidade aparente (CDA) da proteína bruta (PB) e matéria seca (MS) foram avaliados com o fornecimento de dieta experimental composta de 69,5% da dieta referência, 30% CPS e 0,5% de óxido de cromo como marcador inerte. O CDA foi de 96,57% para PB e 76,84% para MS. Em ensaio de alimentação, dietas com níveis crescentes de CPS (0, 33, 67 e 100%) foram oferecidas para juvenis de tilápia (10,0 ± 0,18 g) por 60 dias. Ganho de peso diário, taxa de crescimento específico, retenção proteica, conversão alimentar, composição corporal e histologia hepática não foram afetados (P>0,05) pela substituição. Um segundo ensaio de alimentação comparou crescimento e digestibilidade quando CPS foi suplementado com metionina e treonina (100% CPS+aa, 100% CPS, e 0% CPS). A suplementação resultou em maior ganho de peso diário dos peixes. As dietas 100% e 100% CPS+aa promoveram maiores CDA para proteína que a dieta 0% CPS. No entanto, o CDA para MS foi significativamente maior nos peixes alimentados com 0% CPS quando comparado com 100% CPS. CPS pode substituir FP e FVA em dietas de tilápia do Nilo sem comprometer o desempenho do crescimento, retenção proteica, composição corporal, histologia hepática e digestibilidade proteica. A suplementação de CPS com aminoácidos limitantes, como metionina e treonina, é aconselhável, pois aumenta o ganho de peso e digestibilidade proteica.

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