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Protein to energy ratios and cost, performance, and ammonia excretion in juvenile jundiá (Rhamdia quelen), South American catfish

Freitas, Luiz Eduardo Lima de; Silva, Tarcila Souza de Castro; Fracalossi, Débora Machado.
Sci. agric.; 782021.
Artigo em Inglês | VETINDEX-Express | ID: vti-761863

Resumo

ABSTRACT: The determination of nutritional requirements, based on diets administered in practice, considers physiological specificities and sustainability are essential to the development of suitable aquaculture technologies for novel fish species. The growth of jundiá (Rhamdia quelen Quoy and Gaimard) juveniles (31.54 ± 4.92 g) fed five diets comprising increasing levels of digestible protein (DP: 24, 29, 34, 39, and 44 %) and digestible energy (DE: 12.13, 13.39, 13.81, 14.64, and 15.06 MJ kg1) with DP:DE ratios: 20, 22, 25, 27, and 29 g MJ1, respectively, was evaluated. Each diet was fed to three groups of 25 fish for 75 days. Regression analysis showed that the different DP:DE ratios affected both growth and economic performance as well as excretion of total ammonia nitrogen. Fish fed diets with DP:DE ratios between 22 and 27 g MJ1 achieved a higher daily weight gain, superior apparent net protein utilization, feed conversion rates, and lower feed costs. For the economically viable and environmentally friendly farming of jundiá juveniles in the initial growout stage (30 to 80 g average weight), the best DP:DE ratio was 25 g MJ1 DP:DE (34.05 % DP and 13.81 MJ kg1 DE).
Biblioteca responsável: BR68.1