Níveis de proteína bruta para juvenis de pirarucu

The objective of this work was to verify the effect of four protein levels on pirarucu, Arapaima gigas, growth performance. One hundred and twenty pirarucu juveniles, with an average weight of 120.6±3.5 g, were stocked into 12 floating cages with 1 m3 (ten fish per cage), in a complete randomized design with four treatments (32.7%, 39.3%, 43.4% and 48.6% crude protein), in three replicates each. After 45 days, results showed that diet with highest protein level (48.6%) produced a better weight gain, specific growth rate, and differentiated body composition. Feed conversion and protein efficiency ratios did not show any differences among treatments. The dietary protein level required to produce maximum growth is 48.6%

Effects of enzyme complex SSF (solid state fermentation) in pellet diets for Nile tilapia

The effects of enzyme complex SSF (solid state fermentation) on growth performance and the availability of sucrose and monosaccharides in the chyme of Nile were involved. The study included 360 fish (70g±4.43) in a completely randomized design with six dietary treatments (0, 50, 100, 150, 200 and 250 ppm of SSF) arranged in six replicates, with 10 fish per replicate. Every 15 days, one tilapia of each experimental unit was sacrificed for analyses of carbohydrate in the chyme. On day 60 of the experiment, the performance parameters were measured. There was a linear effect according to treatment for final weight and weight gain. For the other performance parameters, there were no differences. There was quadratic effect for sucrose and glucose in function of the treatment, whereas the fructose levels increased linearly. The addition of 150 ppm of the enzyme complex SSF in the feed improves the performance of Nile tilapia and increases the availability of sucrose and monosaccharides in the chyme

Efeito da densidade de estocagem no desempenho de rã-touro (Rana catesbeiana) em recria Effects of stocking density on performance of bullfrog (Rana catesbeiana) in the post-metamorphic phase

Este trabalho foi realizado com o objetivo de avaliar quatro densidades de estocagem na recria de rã-touro em mini-baias. As densidades estudadas foram: D1: 75 rãs/m&sup2; (inicial) e 35 rãs/m&sup2; (final); D2: 105 rãs/m&sup2; (inicial) e 50 rãs/m&sup2; (final); D3: 125 rãs/m&sup2; (inicial) e 60 rãs/m&sup2; (final); e D4: 160 rãs/m&sup2; (inicial) e 75 rãs/m&sup2; (final). No ensaio de desempenho, foram utilizadas 558 rãs com peso médio de 26,80 g durante 56 dias, distribuídas em um delineamento em blocos casualizados, com seis repetições. Houve efeito das densidades sobre o ganho de peso, que foram inversamente proporcionais. Menores densidades resultaram em maior consumo de alimento, de modo que, com o uso das densidades iniciais de 75 e 105 rãs/m&sup2;, obteve-se maior consumo de alimento que o uso de 125 e 160 rãs/m&sup2;. A conversão alimentar aparente também variou; a densidade inicial de 160 rãs/m&sup2; proporcionou a pior média desse parâmetro. Os tratamentos foram avaliados economicamente, segundo os custos com alimentação, a receita bruta e a receita líquida parcial proporcionados. Concluiu-se que a densidade final de 50 rãs/m&sup2; aumentou a receita líquida parcial, proporcionando resultados mais adequados para produção de rãs.<br>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/m&sup2; (initial) and 35 bullfrogs/m&sup2; (finishing); D2: 105 bullfrogs/m&sup2; (initial) and 50 bullfrogs/m&sup2; (finishing); D3: 125 bullfrogs/m&sup2; (initial) and 60 bullfrogs/m&sup2; (finishing); and D4: 160 bullfrogs/m&sup2; (initial) and 75 bullfrogs/m&sup2; (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 with six replicates. Inversely proportional effects of densities on weight gain were observed. Smaller densities resulted in greater values of feed intake, and the initial densities of 75 and 105 bullfrogs/m&sup2; resulted in higher values of feed intake than 125 and 160 bullfrogs/m&sup2;. The apparent feed conversion also varied , showing the worst average on initial density of 160 bullfrogs/m&sup2;. Economic analysis was performed with the costs with feeding, gross income and partial net income. It was concluded that the final density of 50 bullfrogs/m&sup2; increased the partial net income and was indicated for production of bullfrogs