Crude Protein Levels in the Diets of Tambaqui, Colossoma Macropomum (Cuvier, 1818), Fingerlings

Abstract

-Tambaqui is intensively farmed because of its production characteristics; however, there is a lack of information lacks about the nutritional requirements of this species. The present study aimed to evaluate the effects of various crude protein (CP) levels in the diets of tambaqui fingerlings. A total of 750 fingerlings with an initial weight of 0.35 ± 0.09 g were selected in a completely randomized design with six treatments (experimental feeds with 20%, 24%, 28%, 32%, 36%, and 40% CP), five replicates, and 25 fish per experimental unit. Performance, survival rate, carcass yield, body composition, protein deposition, body fat, and nitrogen retention efficiency were evaluated after 45 days. CP levels did not affect the following: feed conversion, survival rate, moisture content, and carcass yield. However, with increasing CP levels, protein efficiency ratio decreased. Weight gain, feed conversion, and specific growth rate improved until CP levels of 31.57%, 28.90%, and 31.12%, respectively, were achieved. Quadratic effects of elevated CP levels on body fat and body fat deposition were observed at minimum CP levels of 26.55% and 23.77%, respectively; and on body protein, body protein deposition, and nitrogen retention efficiency at maximum CP levels of 29.26%, 32.50%, and 27.21%, respectively. We conclude that a CP level of 31.57% is recommended for the diets of tambaqui fingerlings weighing between 0.35 and 15.11 g, which corresponds to a digestible energy:CP ratio of 9.50 kcal DE/g CP. Keywords:Performance. Initial phase. Protein nutrition. PROTEÍNA BRUTA EM DIETAS PARA ALEVINOS DE TAMBAQUI, COLOSSOMA MACROPOMUM (Cuvier, 1818)RESUMO -O tambaqui é utilizado intensamente na piscicultura em virtude de suas características produtivas, porém há carência de informações sobre suas exigências nutricionais. Objetivou-se avaliar os efeitos de níveis de proteína bruta (PB) em dietas para alevinos de tambaqui. Utilizou-se 750 alevinos com peso inicial de 0,35 ± 0,09 g, em delineamento inteiramente casualizado, com seis tratamentos (rações experimentais com 20, 24, 28, 32, 36 e 40% de PB), cinco repetições e 25 peixes por unidade experimental. Avaliou-se desempenho, taxa de sobrevivência, rendimento de carcaça, composição corporal, deposição de proteína e gordura corporais e eficiência de retenção de nitrogênio, após o período de 45 dias. Os níveis de PB não influenciaram: consumo de ração, taxa de sobrevivência, umidade corporal e rendimento de carcaça. O consumo de PB aumentou e a taxa de eficiência proteica reduziu com a elevação dos níveis de PB. O ganho de peso, a conversão alimentar e a taxa de crescimento específico melhoraram até o nível de 31,57; 28,90 e 31,12% de PB, respectivamente. Observou-se efeito quadrático da elevação dos níveis de PB sobre a gordura corporal, deposição de gordura corporal, proteína corporal, deposição de proteína corporal e eficiência de retenção de nitrogênio, apresentando nível mínimo em 26,55; 23,77% de PB; e nível máximo em 29,26; 32,50; 27,21% de PB, respectivamente. Conclui...

Large-scale SNP discovery and construction of a high-density genetic map of Colossoma macropomum through genotyping-by-sequencing

“…In 2014, production reached 139,209 tons1. This species has been broadly farmed in different Amazon boundary countries and has been introduced to other Latin American countries2, as it is well-suited to aquaculture farming, accepts artificial feed, grows rapidly, and is accepted by consumer markets3. However, genetic studies of tambaqui are limited to genetic diversity surveys456, transcriptome analysis under specific conditions7, some SNPs markers8, and mitochondrial genome sequencing9.…”

Geometric approach to evaluate the energy/protein balance in tambaqui (Colossoma macropomum ): Can fish ensure nutritional intake targets by postingestion signals?

“…(), 0.0439 MJ/g digestible energy per protein is recommended for the diet of juvenile tambaqui (50 g BW). A ratio of 0.03977 MJ digestible energy/g of crude protein is recommended for the diets of tambaqui fingerlings that weigh between 0.35 and 15.11 g (Lima, Bomfim, Siqueira, Ribeiro, & Lanna, ).…”

PENGARUH KADAR PROTEIN PAKAN YANG BERBEDA DENGAN RASIO E/P 8,5 kkal/g PROTEIN TERHADAP PERTUMBUHAN IKAN NILA (Oreochromis niloticus

“…Pakan B tersebut juga dapat meingkatkan pertumbuhan dengan pemanfaatan pakan yang lebih efisien karena protein dan energi dalam pakan dapat dimanfaatkan dan dicerna tubuh ikan dengan baik. Lima et al (2016) melaporkan bahwa peningkatan protein dapat meningkatkan PER hingga level tertentu, hal ini menunjukkan bahwa PER dapat ditingkatkan sampai kebutuhan protein tercapai dan kemudian menurun dengan peningkatan lebih lanjut dalam tingkat protein pakan. Menurut Hadijah et al (2015), penyerapan protein yang baik akan meningkatkan ketersediaan asam amino yang diperlukan untuk pertumbuhan maupun memperbaiki sel-sel yang rusak.…”