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1.
Rev. colomb. biotecnol ; 25(2)dic. 2023.
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1535731

RESUMO

Sorubim cuspicaudus, a migratory catfish distributed in the Magdalena, Sinú, and Catatumbo river basins, is categorized as vulnerable to extinction. Production of fingerlings in controlled environments stands as a strategic conservation approach, and larviculture is a critical phase in rearing this species. Probiotics are used for improvement in the critical stages of fingerling production. The study aimed to evaluate the use of probiotics (Bacillus subtilis and Bacillus licheniformis) during the larviculture phase of S. cuspicaudus. Larvae at 42 hours post-hatching (1.5±0.1mg, total length 5.7±0.4mm) were treated with four levels of probiotic inclusion in the water: 0, 5, 10, and 20ppm for 22 days. Water quality remained within suitable ranges for neotropical catfish species larviculture and the parameters assessed were weight gain (Gw), length gain (Gl), specific growth rate (G), survival rate (S), stress resistance (Sr), intestinal fold length (LF), and colony-forming units (CFU) count. Results showed higher Gl (22.23±3.5mm), Gw (40.0±12.6mg), G (14.9±1.5%/day), LP (205±72.7µm), and CFU (118.7±80.9) were found at 20 ppm (p0.05). The findings of this study suggest that probiotics (Bacillus subtilis and Bacillus licheniformis) could be used as an alternative to advance in the S. cuspicaudus larviculture.


Sorubim cuspicaudus, un bagre migratorio distribuido en las cuencas de los ríos Magdalena, Sinú y Catatumbo, se encuentra catalogado como una especie vulnerable a la extinción. La producción de alevinos en ambientes controlados es considerada como una estrategia crucial para su conservación, y la larvicultura es una fase crítica en la cría de esta especie. Para mejorar esta fase crítica de producción de alevinos se utilizan probióticos. El estudio tenía como objetivo evaluar el uso de probióticos (Bacillus subtilis y Bacillus licheniformis) durante la fase de larvicultura de S. cuspicaudus. Las larvas, a las 42 horas post eclosión (1,5±0,1mg, longitud total 5,7±0,4mm) fueron tratadas con cuatro niveles de inclusión de probióticos en el agua: 0, 5, 10 y 20ppm durante 22 días. La calidad del agua se mantuvo dentro de los rangos adecuados para la larvicultura de especies neotropicales de bagre y los parámetros evaluados fueron el aumento de peso (Gw), el aumento de longitud (GL), la tasa específica de crecimiento (G), la tasa de supervivencia (S), la resistencia al estrés (Sr), la longitud del pliegue intestinal (LF) y el recuento de unidades formadoras de colonias (UFC). Los resultados mostraron mayores GL (22,23±3,5 mm), Gw (40,0±12,6 mg), G (14,9±1,5%/día), LP (205±72,7 µm) y UFC (118,7±80,9) a 20 ppm (p0,05). Los resultados de este estudio sugieren que los probióticos (Bacillus subtilis y Bacillus licheniformis) podrían utilizarse como alternativa para avanzar en la larvicultura de S. cuspicaudus.

2.
Vet Anim Sci ; 22: 100316, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-37822454

RESUMO

Essential oils supplementation has potential growth-promoting, antibacterial, and immunostimulatory effects for various fish species. Dietary supplementation with essential oils improves Nile tilapia's growth and intestinal morphology. The aim of the study was to assess the effect of supplementation with microencapsulated essential oils (MEOs) containing cinnamaldehyde (53.9 %), thymol (24.2 %), and carvacrol (18.7 %) in Nile tilapia fingerlings on growth parameters and foregut histomorphometry. Six thousand fishes with initial body weights and lengths of 1.20 ± 0.32 g and 2.03 ± 0.40 cm, respectively, were reared in two separate 60 m3 circular tanks (control and supplemented with 500 mg/kg of MEOs) at a 5 kg/m3 density. Growth parameters included weight and length. Ten foregut samples per tank were collected at 0-, 15- and 30-days post-treatment. The histological analysis involved the size of intestinal folds and the number of goblet cells. Our results showed that fingerling growth parameters such as final body weight and length increased by 16.9 % and 10.43 %, respectively, with MEOs supplementation compared to the control group. Furthermore, histomorphometry results showed that the supplementation of MEOs led to a significant increase in the growth of both the width and length of intestinal folds and the number of goblet cells (p < 0.05). In conclusion, the early supplementation with MEOs improved the number, length, and width of intestinal folds and increased the number of goblet cells, positively influencing intestinal morphology and health. Additionally, MEOs improved growth parameters in Nile tilapia at 30 days of supplementation.

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