The effects of feeling tilapia filleting by-product meal (TF) for Nile tilapia (Oreochromis Niloticus L.) during the sexual reversion phase were evaluated. Three hundred and seventy-five 2-3-d larvaes were allotted to 25 30L-aquariums, according to a complete randomized design with five treatments of five replications. Aquarium with 15 larvae comprised the experimental unit. Diets were formulated to be isonitrogenous and isoenergetic and contained 38.6% of digestible protein and 3,800 kcal of ED/kg, on increasing levels of TF (0, 5, 10, […]

This work was carried out with the objective of evaluate four stocking densities of bullfrog (post-metamorphic) in mini-stalls. The densities studied were D1: 75 bullfrogs/m² (initial) and 35 bullfrogs/m² (finishing); D2: 105 bullfrogs/m² (initial) and 50 bullfrogs/m² (finishing); D3: 125 bullfrogs/m² (initial) and 60 bullfrogs/m² (finishing); and D4: 160 bullfrogs/m² (initial) and 75 bullfrogs/m² (finishing). The performance trial was carried out with 558 bullfrogs averaging initial weight of 26.80 g, during 56 days, according to a completely randomized blocks design […]

This experiment was conducted to evaluate different levels of digestible energy on the performance of Nile tilapia larvae (Oreochromis niloticus) during the sexual reversion phase. Three hundred and seventy-five larvae with initial average length and weight of 21.0±4.0 mg and 1.19±0.72 cm, respectively, were allotted to 25 30L-aquarium. A completely randomized design with five treatments and five replicates was used. The aquarium with 15 larvae was the experimental unit. The diets were formulated to contain levels of 3,300, 3,525, 3,750, […]

The effects of feeding management strategies on larval rearing of trairao were evaluated in this trial. Eight-d old larvae were counted and stocked in 20 experimental containers (units with volume of 5 L each), with constant aeration and temperature. The stocking density was 30 larvae/L. The following treatments (feeding frequency) were used: F1 – once a day, F2 – twice a day, F3 – three times a day, F4 – four times a day, each with five replicates. Feeding rate […]

This trial was carried out to evaluate the effects of ideal protein concept on reduction of dietary protein content for Nile tilapia (5 to 125 g). A hundred and sixty juvenile fishes (4.40 ± 0.9 g) were assigned to a randomized experimental design with four treatments [25.5, 27, 28.5 and 30% (control) of digestible protein], three replicates and ten fish by experimental unit. Crystalline amino acids were added to maintain amino acid levels according to the ideal protein concept. The […]

The effects of feeding meal of tilapia filleting industrial waste (FW) on performance and body composition for Nile tilapia fry were evaluated. One hundred and twenty Nile tilapia fries (averaging initial weight and length of 0.58±0.05 g and 3.49±0.09 cm, respectively) were assigned to 24 30L-aquariums. The experiment was analyzed a complete randomized design with four treatments and six replications. Diets contained 30% of digestible protein and 3,000 kcal/kg of digestible energy. The following treatments were used: CO – corn […]

The objective of this work was to evaluate the performance, survival and effectiveness of reversion of Nile tilapia fry (Oreochromis niloticus L.) fed with rations containing growing levels of inclusion of poultry by products (FVA). Five hundred Nile tilapia fry were used with two days of age, allotted to a completely randomized design with five treatments and five replications, and the experimental unit an aquarium 30 L with 20 fry. Five rations were elaborated with levels of inclusion of FVA […]

An experiment was carried out to in two steps (the first was hormonal treatments and the other the larvae grow up phase) to determine the best ontogenic periods for larvae of the Nile tilapia (Oreochromis niloticus) regarding masculinization hormonal treatments with 17 a-methyltestosterone (MT) by immersion baths in 2.0 mg MT.L-1 solution for 36 hours. One thousand and two hundred larvae of Nile tilapia, from the same reproduction bunch, were allotted to 24 plastic containers with 0.5 L in a […]

An experiment was carried out to in two steps (the first was hormonal treatments and the other the larvae grow up phase) to determine the best ontogenic periods for larvae of the Nile tilapia (Oreochromis niloticus) regarding the feminization hormonal treatments by immersion baths during 36 hours with a 2.0 mg solution of estradiol valerate17 (VE).L-1. One thousand and two hundred larvae of Nile tilapia, from the same reproduction bunch were used. Larvae were allotted to 24 0.5 L plastic […]

This work aimed to evaluate the effect of protein source origin and lysine and methionine or phosphorus and calcium supplementation to Nile tilapia during sex reversal phase. Two hundred fries were assigned to a completely randomized design with four treatments and five replications, in twenty 12 L aquarium. One aquarium with 10 Nile tilapia fry was considered an experimental unit. Morning and afternoon temperatures, dissolved oxygen, pH and electric conductivity was 22.6 ± 0.1ºC, 24.1± 0.4ºC; 6.77 ± 0.38 mg/L, […]