Journal
AQUACULTURE
Volume 277, Issue 1-2, Pages 66-72Publisher
ELSEVIER
DOI: 10.1016/j.aquaculture.2008.01.032
Keywords
dietary administration; sodium alginate; Epinephelus fuscoguttatus; Streptococcus sp.; iridovirus; innate immunity
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Survival rates of the juvenile grouper Epinephelus fuscoguttatus against Streptococcus sp. and an iridovirus, and non-specific immune parameters such as alternative complement activity (ACH(50)), lysozyme activity, natural hemagglutination activity, respiratory bursts, superoxide dismutase (SOD) activity, and phagocytic activity were determined when the fish were fed diets containing sodium alginate at 1.0, or 2.0 g kg(-1). Fish fed a diet containing sodium alginate at the level of 1.0 or 2.0 g kg(-1) had a significantly higher survival rate than those fed the control diet after challenge with Streptococcus sp. and an iridovirus. The ACH(50) level, lysozyme activity, respiratory bursts, phagocytic activity, and SOD level of fish fed diets containing sodium alginate at 1.0 and 2.0 g kg(-1) after 6-9 days significantly increased, compared to those of fish fed the control diet. We therefore recommend dietary sodium alginate administration at >= 1.0 g kg(-1) to enhance immunity and resistance against Streptococcus sp. and an iridovirus of E. fuscoguttatus. (C) 2008 Elsevier B.V. All rights reserved.
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