Effect of water velocity on intermediary metabolism of juvenile matrinxã fish (Brycon amazonicus)

Background: determination of water velocity for optimum fish growth is fundamental since its duration and intensity can interfere with the metabolic preference for some biochemical paths, resulting in the use of specific substrates for fish growth. Objective: the purpose of this study was to assess...

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Bibliographic Details
Published in:Revista Colombiana de Ciencias pecuarias 2013-12, Vol.26 (4), p.288-299
Main Authors: Moraes, Gilberto, Arbeláez Rojas, Gustavo Alberto
Format: Article
Language:English
Subjects:
ajustes metabólicos
desempenho
desempeño
energy reserves
fat bulks
gordura visceral
grasa visceral
metabolic adjustments
natación sustentada
natação sustentada
reservas energéticas
sustained swimming
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Summary:Background: determination of water velocity for optimum fish growth is fundamental since its duration and intensity can interfere with the metabolic preference for some biochemical paths, resulting in the use of specific substrates for fish growth. Objective: the purpose of this study was to assess the metabolic adjustments of juvenile matrinxã (Brycon amazonicus) reared under various sustained swimming conditions (SS). Methods: fish were subjected to SS for 90 days at five swimming speeds: 0.0 (control), 1.0, 1.5, 2.0, and 2.5 Body Length per second (BL/s). At the end of the experimental period, fish were euthanized; samples of blood, liver, white-muscle, red-muscle and ventral muscle were collected and metabolite concentrations were evaluated. Results: fish reared between 1.0-1.5 BL/s increased the hepatosomatic index (HSI) while those swimming at velocities higher than 1.5 BL/s showed diminished HSI and visceral fat. Fish under moderate swimming utilized visceral fat to supply energy for red muscle contractions while white muscle of fish swimming at higher speeds used carbon backbones from amino acids plus visceral fat. Conclusion: sustained swimming between 1.0-1.5 BL/s enhanced the intermediary metabolism of B. amazonicus, improving fish performance. Future studies linking macronutrient dietary levels and SS should allow adjusting rearing conditions under SS to optimize growth versus metabolic performance. Antecedentes: a determinação da velocidade da água para o ótimo crescimento dos peixes é importante porque dependendo da intensidade e duração, pode interferir sobre a predominância na ativação de uma ou de outra via metabólica, indicando maior ou menor utilização de um determinado substrato energético e agir no crescimento. Objetivo: o propósito deste trabalho foi estudar os efeitos que o exercício de natação tem sobre o metabolismo de juvenis do peixe Matrinxa, Brycon amazonicus. Métodos: juvenis de B. amazonicus foram criados e condicionados a nadar durante 90 dias em cinco velocidades de natação: 0,0 (controle); 1,0; 1,5; 2,0 e 2,5 comprimentos corporais por segundo (CC s-1). Após termino do período experimental, os peixes foram sacrificados, o sangue, fígado, músculos branco, vermelho e ventral foram coletados para avaliar o perfil metabólico. Resultados: velocidades moderadas de natação entre 1,0 a 1,5 CC s-1 aumentaram o índice hepatosomático (HSI), enquanto que, o condicionamento dos peixes a maiores velocidades diminuiu significativamente o
ISSN:0120-0690