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  • 1
    Publication Date: 2021-05-19
    Description: Se evaluaron cuatro niveles de alimentación en el comportamiento productivo de Clarias gariepinus (8,0 + 0,01 g de peso medio inicial) en la etapa de preceba, mediante un diseño completamente aleatorizado. Los tratamientos fueron: TI- Pienso vegetal al 5 % del peso corporal; TII- Pienso vegetal al 3 % y desechos pesqueros al 2 % del peso corporal; TIII- Pienso vegetal al 3 % y desechos pesqueros al 2 % en base seca (que representó el 6 % en base húmeda) del peso corporal y TIV- Pienso vegetal y desechos pesqueros según Tabla del Laboratorio de Nutrición. Los mejores crecimientos (p 〈 0,001) se encontraron con los tratamientos TIII y TIV (111,2 y 116 g de pesos finales, respectivamente), los que se correspondieron con los niveles de alimentación más altos. La eficiencia alimentaria fue más favorable con TII (conversión del alimento de 1,2 y eficiencia proteica de 3,8), la que difirió (p 〈 0,01) del resto de las dietas. La supervivencia no presentó diferencias significativas (p 〉 0,05), sin embargo, la productividad fue mayor en TIV (11,4 kg/m3). El análisis económico mostró la mayor ganancia para TIV con un monto de $ 9 493,7 en menor tiempo de cultivo (50 días).
    Description: Four levels of feeding in the productive behaviour of Clarias gariepinus (8,0 + 0,01 g of average weight) in the pre-fattening period, according to a complete randomized experimental design were evaluated. The treatments were: TI- Vegetable feed at 5 % of body weight; TII- Vegetable feed at 3 % of body weight and fishing waste at 2 % of body weight; TIII- Vegetable feed at 3 % and fishing waste at 2 % in dry base (that represented 6 % humid basis) of body weight; TIV- Vegetable feed and fishing waste according to the table of the Nutrition Laboratory. The better growths (p 〈 0,001) were found in TIII and TIV (with 111, 2 and 116 g of final weight, respectively), which were associated with the highest feeding levels. The most favorable feeding efficience was with TII (feeding conversion of 1,2 and protein efficience of 3,8), this one differed (p 〈 0,01) from the rest of the treatments. The survival rate didn’t presented significatives differences (p 〉 0,05), however the productivity was highest in TIV (11,4 kg/m3). The economical analysis showed that the major gain was for the TIV with $ 9 493,7 and the fewest culture time (50 days).
    Description: Published
    Description: levels of feeding
    Description: clarias
    Keywords: Fish wastes ; Feeding
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 2
    Publication Date: 2021-05-19
    Description: Se evaluó el uso de desechos de pescado frescos y ensilados (por acidificación y fermentación láctica), como única fuente de proteína animal en dietas semihúmedas para híbridos de Clarias gariepinus x Clarias macrocephalus (4,53 + 0,05 g de peso inicial promedio). Estas dietas se compararon con un alimento balanceado comercial (20 % de harina de desechos de pescado) durante 60 días. Los resultados mostraron que los mejores indicadores de crecimiento y utilización de la proteína se obtuvieron con los desechos frescos, los que difirieron significativamente (p 〈 0,05) de los ensilados y la harina de pescado; sin embargo, la conversión alimentaría (base seca) y supervivencia (〉 85 %) fue similar entre las dietas. Los ensilados y la harina de pescado no tuvieron diferencias significativas (p 〉 0,05) en los indicadores evaluados, por lo que constituye una alternativa para la producción de alimentos acuícolas para países en vía de desarrollo.
    Description: Fish offal waste and silage (by acidification and lactic fermentation), as a unique source of animal protein in half moist diets for Clarias gariepinus x Clarias macrocephalus hybrids (4,53 + 0,05 g initial middle weight) was assessed. These diets were compared with a balanced commercial food (20 % fish offal meal) during 60 days. The results showed that the best growth indicators and protein utilization were obtained by fresh wastes, which were significantly differed (p 〈 0,05) from silage and fish meal. However, the food conversion (dry base) and survival rate (〉85 %) were similar between the diets. Silage and fish meal did not significantly differed (p 〉 0,05) in the evaluated indicators; Therefore, this represents an alternative for aquaculture food production in developing countries.
    Description: Published
    Description: clarias
    Keywords: Feeding ; Fish wastes ; Fish wastes ; Fish silage ; Feeding
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 3
    Publication Date: 2021-05-19
    Description: The objective of this work was to evaluate the biologic and economic effects of chemical fish silage as a unique animal protein source. Ensiled Opisthonema oglinum with three combinations of organic and inorganic acids: 3 % of formic acid; 2 % sulfuric acid 98 % and 2 % formic acid and other with 2,6 % phosphoric acid; 2,6 % of citric acid and 0,1 % of sodium benzoate. From each silage a moist diet was prepared and was compared with commercial food (20 % of fish meal) in Clarias gariepinus feeding during 60 days. There were not significant differences (p 〉 0,05), in growth, feed utilization and survival indicators. The economic analysis showed a fingerling production cost saves between 20 and 30 % for feeding concept.
    Description: The objective of this work was to evaluate the biologic and economic effects of chemical fish silage as a unique animal protein source. Ensiled Opisthonema oglinum with three combinations of organic and inorganic acids: 3 % of formic acid; 2 % sulfuric acid 98 % and 2 % formic acid and other with 2,6 % phosphoric acid; 2,6 % of citric acid and 0,1 % of sodium benzoate. From each silage a moist diet was prepared and was compared with commercial food (20 % of fish meal) in Clarias gariepinus feeding during 60 days. There were not significant differences (p 〉 0,05), in growth, feed utilization and survival indicators. The economic analysis showed a fingerling production cost saves between 20 and 30 % for feeding concept.
    Description: Published
    Description: clarias, chemical fish silage
    Keywords: Feeding ; Feeding
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 4
    Publication Date: 2021-05-19
    Description: The objective of this study was to evaluate five half-moist diets with graded levels of chemical fish silage (40, 50, 60, 70 and 80 %) prepared with 2 % sulfuric acid 98 % (weigth/volumen), as a unique animal protein source. They were compared with a commercial food (20 % of fish meal), Clarias gariepinus feeding during 60 days. The experimental design was completely randomized and the statistical analysis of the results was done through analysis of variance and the results were compared through the Duncan test at 5 %. The results showed that indicators such as: growth, feed utilization and survival rate did not differ significantly (p 〉 0,05) between experiment diets, representing between $188,00 and 302, 00 USD/t saving at fingerling.
    Description: El objetivo de este estudio fue evaluar cinco dietas semihúmedas con diferentes niveles de inclusión de ensilado químico de pescado (40, 50, 60, 70 y 80 %), preparado con 2 % de ácido sulfúrico 98 % (peso/volumen), como única fuente de proteína animal, las que fueron comparadas con un alimento comercial (20 % de harina de pescado) en la alimentación de alevines de Clarias gariepinus durante 60 días. El diseño experimental fue completamente aleatorizado y el análisis estadístico se realizó mediante el análisis de varianza y las medias se compararon a través del test de Duncan al 5 %. Los resultados mostraron que los indicadores de crecimiento, utilización del alimento y supervivencia no presentaron diferencias significativas (p 〉 0,05) entre los tratamientos ensayados, lo que representó un ahorro entre 188,00 y 302,00 USD/t de alevines.
    Description: Published
    Description: clarias, chemical fish silage
    Keywords: Feeding ; Feeding
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 5
    Publication Date: 2021-05-19
    Description: El objetivo del presente trabajo fue determinar la composición y los índices de identificación y calidad de la fracción lipídica de los ensilajes (químico y biológico) de residuos del fileteado de tilapias. El ensilaje químico se preparó con 2 % de ácido sulfúrico 98 % y 1 % de ácido fórmico (p/v) y el biológico con 15 % de miel de caña y 3 % de yogurt (Lactobacillus acidophillus) (p/p) y se almacenaron por 30 días. Los resultados mostraron que ambos ensilajes poseen todos los ácidos grasos presentes en la materia prima y el 60 % fueron insaturados. El oleico (18:1ω9) fue el de mayor concentración (30,2 %) seguido del palmitico (18:0) (27,4 %) y linoleico (18:2ω6) (16,8 %). Los índices de iodo (878 mg/g), saponificación (194,5 mg KOH/g) y ácidos grasos libres (3,4 %) fueron compatibles con los datos de la literatura. Los valores de peróxidos resultaron bajos en los ensilajes e indicaron una menor tendencia a la oxidación en los residuos fermentados.
    Description: To determine the composition and indexes of identification and quality the lipid fraction of the silage (chemical and biological) from tilapia filleting waste was the aim of the present work. The chemical silage was prepared with 2 % of sulfuric acid 98 % and 1 % formic acid (w/v) and the biologycal silage with 15 % of sugar cane molasses and 3 % of yogurt (Lactobacillus acidophilus) (w/w) and stored for 30 days. The results showed that both silages have oll fatty acids from raw material, with 60 % value of unsaturated acids. The oleic acid (18:1ω9) was higher concentration (30,2 %) followed by the palmitic acid (18:0) (27,4 %) and linoleic acid (18:2ω6) (16,8 %). The indexs of iodo (878 mg/g), saponification (194,5 mg KOH/g) and free fatty acids (3,4 %) were compatibles with the data in the literature. The value of peroxid resulted low and indicated fermented waste presented fewer tendencies to oxidize.
    Description: Published
    Description: lipid fraction
    Keywords: Fatty acids ; Fish silage ; Lipids
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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