For the research work, it was developed at the Fernando Alcántara Bocanegra Research Center (CIFAB) of the Water and Its Resources Use Research Program (AQUAREC) at the Institute of Amazonian Research of Peru (IIAP), with the main objective of determining the optimal density for postlarval rearing of Myleus schomburgkii “blackbanded palometa” for a period of 15 days. A total of 1,350 postlarvae were used, which came from the Nanay River. The average weights ranged from 0.02 g to 0.03 g, and the length ranged from 1.12 cm to 1.25 cm. These were selected homogeneously and were randomly distributed into 9 tanks of 36 liters capacity, with a useful volume of 15 liters, at densities of T1: 5, T2: 10, and T3: 15 postlarvae/liter of water. They were fed “ad libitum” with a balanced feed containing 50% crude protein, which was ground and sieved. The feedings occurred at different interv...

The effect of including fish protein hydrolyzate in the diet on body growth and proximate composition of the muscle of juvenile spotted tiger shovelnose catfish (Pseudoplatystoma punctifer) was evaluated. A completely randomized experimental design with a 2x4 factorial arrangement (2 diets, 4 sampling times [days 15, 30, 45 and 60]) was used, resulting in 8 treatments with 3 replications each. The formulated diets were isocaloric (42.15% CP) and isoproteic (4 415.69 kcal EB kg-1): a control (DT; without supplementation) and another with the inclusion of 1.20% fish protein hydrolyzate (DHP) in substitution of fishmeal. A total of 114 juveniles (642.65 g; 47.93 cm) were distributed in excavated ponds of 200 m2 (19 fish/pond) for 60 days. Every 15 days, eight fish per experimental unit were captured to evaluate body growth (final weight FW, final length FL, weight gain WG, length gain LG, s...