Intermittent sustained swimming in 'matrinxã' Brycon amazonicus (Bryconidae: Bryconinae): hematological and metabolic responses

Abstract

In fish, studies on a wide variety of physiological effects of exercise have been reported since a long time. It has been attributed special attention to some types of exercise, however, its application as a healthful practice in the rearing and welfare of farming fish is rising in last few years. In this particular, long-term intermittent sustained swimming (ISS) has been not yet explored. In this work, the freshwater fish Brycon amazonicus was submitted to (ISS) for 30 days at velocity of 1.0 body-length sec -1 for 12h interspaced by 12h under still water. Hematology and metabolism were evaluated. Exercised fish decreased 30% the erythrocyte number and hemoglobin was unvaried. The stores of liver glycogen and muscular triacylglycerol (TAG) were increased and the metabolic profile was typically aerobic. The slight decrease of liver (TAG) plus the full metabolic and hematic trait allow investing in this kind of exercise a beneficial practice in the rearing of fish species.Há muito tempo, tem sido relatada uma ampla variedade de efeitos fisiológicos em peixes sob exercício. Tem sido dada especial atenção a alguns tipos de exercício, mas, sua aplicação como prática salutar na criação e para o bem estar dos peixes vem crescendo nos últimos anos. Neste caso, a natação sustentada intermitente (ISS) por longos períodos ainda não foi explorada. Neste trabalho, o peixe de água doce Brycon amazonicus foi submetido a (ISS) por 30 dias à velocidade de 1,0 comprimento corporal s -1 por 12h intervalado de 12h sob regime de água sem movimento. A hematologia e o metabolismo foram avaliados. Os peixes exercitados diminuíram 30% a contagem de eritrócitos e o teor de hemoglobina permaneceu constante. Os estoques de glicogênio hepático, o teor de triacil glycerol muscular (TAG) aumentou e o perfil metabólico foi tipicamente aeróbico. O discreto aumento de TAG hepático, além das características hematológicas e do metabolismo como um todo, instiga-nos investigar este tipo de exercício como uma prática benéfica na criação de peixes.

Resting time before slaughter restores homeostasis, increases rigor mortis time and fillet quality of surubim Pseudoplatystoma spp.

“…This occurred due to the maintenance of glucose metabolism in these animals during the experimental period. This dynamic of use of hepatic glycogen is reported for fish subjected to transport stress [47] and to sustained exercise [48].…”

Cannibalism, growth performance, and body composition of giant trahira juveniles under different photoperiods

“…Only lipid was influenced by photoperiod, since the animals from the 6L:18D group showed the lowest value for this parameter. Possibly, fish subjected to this photoperiod showed an increased mobilization of lipids required to cover high energy demand due to high activity such as fights and escape from cannibalism, as lipids are catabolized to meet the energy demands of muscles (Fabrizzi et al, 2013). Furthermore, with cannibalism, this fish species eats a more complete food, and easy digestion and absorption occur, which reduces the deposition of lipids (Kolkovski, 2001).…”