Digestibility of diets with flour fish silage for the growing of arawana (Osteoglossum bicirrhossum)

ABSTRACT Objective. The purpose of this research was to evaluate the digestibility of different nutritional and energy components of artificial diets containing flour fishsilage used in growing of arawana fingerlings (O. bicirrhossum). Materials and methods. 240 fingerlings distributed in 12 tanks with 20 fish per experimental unit were handled, in a completely randomized design made up of 4 treatments with three replicates, each with inclusions of 0 (0ESH), 10 (10ESH), 20(20ESH) and 30% flour fish silage (30ESH) of treatments T0, T1, T2 and T3 respectively; fromflour fish silagein order to formulate isoenergetic and isonitrogenous diets in the different treatments to avoid sources of miscalculation of the experimental variables. Results. High digestibility coefficients were observed in treatments T1 (10ESH) and T3 (30ESH). The protein, lipid and energy utilization ratios were greater than 60%, which shows the importance of including flour fish silage as a source of protein to improve the various growth parameters. Significant differences between treatments were found in the increase of length (p≤0.05), showing that the T1 was the best treatment with an average of 1.21±0.29 cm. Conclusions. According to the coefficients of digestibility, length increase and benefit – cost ratio, the best treatment was T1 (10ESH) used to feed arawana (O. bicirrhossum), during the growing period, demonstrating the economic and ecological advantages for utilization of this source of protein in aquaculture. RESUMEN Objetivo. Analizar la digestibilidad de los diferentes componentes nutricionales y energéticos en dietas balanceadas con niveles de harina de hidrolizado de vísceras de cachama en el alevinaje de arawana (O. bicirrhossum). Materiales y métodos. Se evaluaron 240 alevinos, distribuidos en 12 acuarios a razón de 1 animal/5 L. Se utilizó un diseño completamente al azar, conformado por cuatro tratamientos con tres réplicas cada uno, con inclusiones de 0 (0ESH), 10 (10ESH), 20 (20ESH) y 30% de extracto seco de hidrolizado de vísceras de cachama (30ESH) para los tratamientos T0, T1, T2 y T3 respectivamente; para evitar fuentes de error en el cálculo de las variables experimentales, se formularon dietas isoenergéticas e isonitrogenadas. Resultados. Se detectaron diferencias estadísticas significativas en el incremento de longitud (p≤0.05), indicando que el T1 (10ESH) es el mejor tratamiento con un promedio de talla de 1.21 ±0.29 cm, además, se obtuvieron coefici