Proteina bruta em dietas para reprodutores de tilápia do Nilo

Abstract

The effect of different levels of crude protein (32A, 32B, 36, 38, 44 and 50% CP; 3,500 kcal digestible energy) on Nile tilapia broodstock was assessed. After 30 experimental weeks (Sept./14 to Mar./15), 91.0% of eggs from fish fed 44% CP hatched and produced 16.4% more viable larvae than the treatment with 32% CP. Egg production and absolute fecundity were similar between treatments (p>0.05). Sperm motility, average path, straight line and curvilinear velocities showed satisfactory values with 44% CP, unlike 36% CP. Lower profitability was observed with 32% CP; profit increased as protein level upped. Statistically significant responses were not found for reproductive performance of females. Results were satisfactory for commercial-scale production as crude protein increased. The initial hypothesis was demonstrated for most parameters assessed in males, larvae growth and economic viability. Therefore, it is recommend the use of diets with 44% CP for Nile tilapia brood fish.

Protein requirement in the diet of Heros severus (Heckel, 1840): An Amazonian ornamental fish

“…For younger fish, due to greater muscle growth, the CP requirement is higher than that of older fish. (Abdel‐Tawwab, Ahmad, Khattab, & Shalaby, 2010; Ribeiro, Rodrigues, & Fernandes, 2007; Zuanon et al, 2009). In addition, protein represents an important energetic source in the metabolic pathways of fish development (Meyer & Fracalossi, 2004; Veras et al, 2010).…”

“…The CP requirement for Nile tilapia, Oreochromis niloticus , larvae and fingerlings, was 45 and 35%, respectively, providing the highest weight gain values and specific growth rate (Abdel‐Tawwab et al, 2010). Angelfish, Pterophyllum scalare fingerlings and juveniles showed best weight gain and specific growth rate when fed diets containing 34 or 32% of CP (Ribeiro et al, 2007; Zuanon et al, 2009).…”