Aquat. Living Resour.
Volume 27, Number 2, April-June 2014
|Page(s)||73 - 81|
|Published online||28 November 2014|
Effect of dietary water content on European sea bass (Dicentrarchus labrax) growth and disease resistance
1 IFREMER, Unité Biologie des
organismes marins exploités, UMR 5119 Ecosym, Chemin de Maguelone, 34250
Palavas les Flots,
2 IFREMER, Centre du Pacifique, Unité Ressources marines en Polynésie Française, Taravao, Tahiti, French Polynesia
a Corresponding author:
Accepted: 24 October 2014
The effect of dietary water content on Dicentrarchus labrax growth parameters and resistance to Vibrio anguillarum infection was investigated using commercial pellets with identical energy contents and different moisture levels. The first experiment hypothesis was that moisturizing pelleted ration can have an impact on Dicentrarchus labrax growth performance by the osmoregulation energy cost reduction. In a second time, the experiment explores the effect of water addition in pellets on the fish resistance to a disease. A specific device was built to uniformly moisturize dry pellets to different moisture levels, i.e. 8%, 20%, 40% and 60%. After an acclimation period and a 54-day rearing period, the control fish had grown from 72.7 ± 17.9 g to 133.3 ± 29.4 g. No significant differences were recorded for fish growth parameters. After the growth period, the tagged fish were mixed and challenged by bath exposure to live Vibrio anguillarum in triplicate. After 7 days, mortality was significantly lower in the group of fish fed with pellets containing 60% water. Adding water to Dicentrarchus labrax feed did not affect fish growth parameters but increase its resistance to a Vibrio anguillarum infection. The moisturizing process could be used to add specific compounds (such as probiotics or vitamins) to pellets just before fish feeding and could have a positive effect on fish rearing.
Key words: Fish aquaculture / Dietary moisture content / Feed pellets / Fish growth / immunity / Dicentrarchus labrax / Vibrio anguillarum
© EDP Sciences, IFREMER, IRD 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.