RESUMO

Behavior activities of giant freshwater prawn Macrobrachium rosenbergii juvenile, their performance, and acquired lesions when under temporary feed restrictions were analyzed. Five animals/experimental units (10 prawns/m2 ) were employed for treatments DFL ­ daily feed supply in the light phase; DFD ­ daily feed supply in the dark phase; AFL ­ alternating feed supply in the light phase; and AFD ­ alternating feed supply in the dark phase, for a 24-hour period, with four replications each. Prawns were fed a pellet diet, twice a day, with 10% of their biomass/day. Specimens were monitored during 60 consecutive days, with behavior recording daily and weighed every 10 days, with assessment of lesions and/or amputated limbs at the end of the experimental period. Types of behavior comprised exploring, grooming, inactivity, crawling, swimming, excavation, burrowing, agonism, and feed ingestion by scan sampling, with instantaneous registration every 60 s, in 15-min windows, before and after feed, in light and dark phases. Feed restricted in alternate days during light and dark phases did not interfere in growth or survival of the specimens, with increase in apparent feed intake and less feed conversion ratio and specific growth rate. Agonistic behavior was higher in specimens with feed restrictions, with an increase in the number of lesions and amputations. The above demonstrates welfare decrease in farmed M. rosenbergii and depreciation in the quality of the final product.(AU)

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RESUMO

The effects of two feeding management methods (substrate spreading and feeding tray) were tested for Macrobrachium rosenbergii, evaluating their influence on behavior in mixed (Mi), monosex all-male (Mm) and monosex all-female (Mf) populations. Twelve experimental conditions, totaling 192 animals, with four repetitions each, were performed. Experimental units comprised eight 250-L aquariums (50 x 50 x 100 cm) with soft sand substrate. Behavioral data were collected by focal instantaneous sampling method. Substrate spreading triggered the most extensive behavioral level in all populations under analysis, featuring exploring, autogrooming, crawling, inactivity, burrowing, agonism, swimming and feed ingestion, and revealed that the animals expressed better their behavior when feed was spread. Exceptionally, burrowing in Mm and agonism in Mf had similar level rates for the two feeding managements. Mf had the highest agonistic level when compared to that in Mm and Mi. Data in current analysis indicate that the spread feeding strategy favors animal welfare in all types of population compositions, except in Mf culture, with high agonistic levels in both forms of feeding management.

Foram avaliados os efeitos de dois métodos de alimentação (a lanço e em comedouros) e sua influência no comportamento de populações mistas (Mi), monossexo fêmea (Mf) e monossexo macho (Mm) de Macrobrachium rosenbergii, nas fases clara e escura do dia. Foram analisadas 12 condições experimentais, com quarto repetições cada, totalizando 192 animais observados. As unidades experimentais consistiram em 8 aquarios (250 L; 50 x 50 x 100 cm) com substrato de areia fina. Dados comportamentais foram coletados usando método de amostragem focal instantâneo. A oferta a lanço, em todas as composições populacionais, induziu a maiores níveis dos comportamentos de exploração, limpeza, enterramento, inatividade, entocamento, agonismo, natação e ingestão do alimento, indicando que os animais encontraram mais oportunidades para expressão de seus comportamentos com o espalhamento da ração. Como exceção, o comportamento de entocamento em Mm e agonismo em Mf foram semelhantes para ambos tipos de manejo alimentar. O cultivo Mf apresentou maiores níveis de agonismo que Mm e Mi. Nesse estudo, os resultados indicam que, em todos os tipos de composição populacional, a alimentação a lanço favoreceu o bem-estar estar animal, exceto para o cultivo Mf, o qual apresentou altos níveis de agonismo em ambas as formas da estratégia alimentar.

Assuntos

RESUMO

The effects of two feeding management methods (substrate spreading and feeding tray) were tested for Macrobrachium rosenbergii, evaluating their influence on behavior in mixed (Mi), monosex all-male (Mm) and monosex all-female (Mf) populations. Twelve experimental conditions, totaling 192 animals, with four repetitions each, were performed. Experimental units comprised eight 250-L aquariums (50 x 50 x 100 cm) with soft sand substrate. Behavioral data were collected by focal instantaneous sampling method. Substrate spreading triggered the most extensive behavioral level in all populations under analysis, featuring exploring, autogrooming, crawling, inactivity, burrowing, agonism, swimming and feed ingestion, and revealed that the animals expressed better their behavior when feed was spread. Exceptionally, burrowing in Mm and agonism in Mf had similar level rates for the two feeding managements. Mf had the highest agonistic level when compared to that in Mm and Mi. Data in current analysis indicate that the spread feeding strategy favors animal welfare in all types of population compositions, except in Mf culture, with high agonistic levels in both forms of feeding management.(AU)

Foram avaliados os efeitos de dois métodos de alimentação (a lanço e em comedouros) e sua influência no comportamento de populações mistas (Mi), monossexo fêmea (Mf) e monossexo macho (Mm) de Macrobrachium rosenbergii, nas fases clara e escura do dia. Foram analisadas 12 condições experimentais, com quarto repetições cada, totalizando 192 animais observados. As unidades experimentais consistiram em 8 aquarios (250 L; 50 x 50 x 100 cm) com substrato de areia fina. Dados comportamentais foram coletados usando método de amostragem focal instantâneo. A oferta a lanço, em todas as composições populacionais, induziu a maiores níveis dos comportamentos de exploração, limpeza, enterramento, inatividade, entocamento, agonismo, natação e ingestão do alimento, indicando que os animais encontraram mais oportunidades para expressão de seus comportamentos com o espalhamento da ração. Como exceção, o comportamento de entocamento em Mm e agonismo em Mf foram semelhantes para ambos tipos de manejo alimentar. O cultivo Mf apresentou maiores níveis de agonismo que Mm e Mi. Nesse estudo, os resultados indicam que, em todos os tipos de composição populacional, a alimentação a lanço favoreceu o bem-estar estar animal, exceto para o cultivo Mf, o qual apresentou altos níveis de agonismo em ambas as formas da estratégia alimentar. (AU)

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BACKGROUND: This research aimed to investigate whether consumer acceptance is affected by information on sustainable practices on the product label. Hedonic evaluations of freshwater prawns were performed by 80 consumers under three aspects: the blind condition - consumers taste samples without information; expected - without tasting samples, consumers evaluated the message 'Freshwater prawns were grown using sustainable practices, reducing environmental impacts caused by traditional breeding'; informed - in which prawns were tasted and the card evaluated. RESULTS: For the entire consumer group, it was observed that the message about sustainability on packaging increased freshwater prawn acceptability (8.25, expected condition (E) versus 6.75, blind condition (B)). High scores were observed under all three test conditions, ranging from 6 (like slightly) to 9 (like extremely), on a 9-point scale. CONCLUSION: It can be concluded that the use of sustainable information can influence consumers' perception and increase their preference toward freshwater prawns, and even increase the sensory attributes of the product.

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