Dietary supplementation of heat-treated Gracilaria and Ulva seaweeds enhanced acute hypoxia tolerance in gilthead sea bream (Sparus aurata)

Biology Open
Leonardo J MagnoniJ Pérez-Sánchez

Abstract

Intensive aquaculture practices involve rearing fish at high densities. In these conditions, fish may be exposed to suboptimal dissolved O2 levels with an increased formation of reactive O2 species (ROS) in tissues. Seaweeds (SW) contain biologically active substances with efficient antioxidant capacities. This study evaluated the effects of dietary supplementation of heat-treated SW (5% Gracilaria vermiculophylla or 5% Ulva lactuca) on stress bioindicators in sea bream subjected to a hypoxic challenge. 168 fish (104.5 g average weight) were distributed in 24 tanks, in which eight tanks were fed one of three experimental diets for 34 days: (i) a control diet without SW supplementation, (ii) a control diet supplemented with Ulva, or (iii) a control diet with Gracilaria Thereafter, fish from 12 tanks (n=4 tanks/dietary treatment) were subjected to 24 h hypoxia (1.3 mg O2 l(-1)) and subsequent recovery normoxia (8.6 mg O2 l(-1)). Hypoxic fish showed an increase in hematocrit values regardless of dietary treatment. Dietary modulation of the O2-carrying capacity was conspicuous during recovery, as fish fed SW supplemented diets displayed significantly higher haemoglobin concentration than fish fed the control diet. After the challen...Continue Reading

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Citations

Jul 30, 2019·Frontiers in Physiology·Juan Antonio Martos-SitchaJaume Pérez-Sánchez
Nov 15, 2020·Fish Physiology and Biochemistry·Erick PereraJaume Pérez-Sánchez

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Methods Mentioned

BETA
environmental stress
environmental
ELISA
PCR
PCRs

Software Mentioned

SPAROS
Realplex
ALGAPLUS
SigmaPlot

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