UNESP Aquaculture Center (CAUNESP), Via de Acesso Prof. Paulo Donato Castellane, Jaboticabal 14884-900, Brazil.
São Paulo Agribusiness Technology Agency (APTA), Regional Polo of Vale do Ribeira, Rodovia BR 116, km 460, São Paulo 11900-000, Brazil.
Genes (Basel). 2023 Oct 23;14(10):1976. doi: 10.3390/genes14101976.
We evaluated the growth performance of pacu and tambaqui and their reciprocal hybrids (tambacu and paqui) under different feeding programs. We raised 30 individuals from each species and their respective crosses, distributing them into three replicate cages with 10 individuals each. Throughout the 5-month experimental period, the fish were weighed six times while exposed to diverse feeding regimens involving three commercial diets with varying combinations of crude protein (CP) levels: 24%, 28%, and 32%. Growth curves were adjusted using nonlinear models. The evaluation period was insufficient for adjusting the logistic model for the tambaqui and paqui treatments with the highest initial protein intake. Pure pacu had a higher ( < 0.05) growth rate (k = 0.0185) than in the tambacu hybrid (k = 0.0134) and proved to have an early performance since animals from this group reached their weight at inflection faster. Despite growing more slowly, tambacu reached a higher ( < 0.05) final weight (A = 1137.12) than in the pacu (A = 889.12). Among the feeding programs, animals that received less CP showed greater growth potential; however, longer evaluation is important to verify if the initial CP intake has no significant positive effect on fish growth.
我们评估了食人鱼和淡水鳕鱼及其正反交杂种（塔巴库鱼和巴奇鱼）在不同饲养方案下的生长性能。我们从每个物种及其各自的杂交种中饲养了 30 条个体，将它们分配到三个重复的笼子中，每个笼子有 10 条个体。在 5 个月的实验期间，我们对不同的饲养方案中的鱼进行了 6 次称重，这些方案涉及三种不同组合粗蛋白（CP）水平的商业饲料：24%、28%和 32%。使用非线性模型调整生长曲线。对于初始蛋白摄入量最高的塔巴库鱼和巴奇鱼处理，对数模型的调整时间不足。纯食人鱼的生长速度（k = 0.0185）高于塔巴库杂交鱼（k = 0.0134）（<0.05），并且表现出早期性能，因为该组的动物更快地达到拐点体重。尽管生长较慢，但塔巴库鱼的最终体重（A = 1137.12）高于食人鱼（A = 889.12）（<0.05）。在饲养方案中，接受较低 CP 的动物具有更大的生长潜力；然而，需要更长时间的评估来验证初始 CP 摄入量是否对鱼类生长没有显著的积极影响。
