In:
Israeli Journal of Aquaculture - Bamidgeh, SAABRON PRESS, Vol. 68 ( 2016-1-1)
Abstract:
Two trials were conducted to determine the effects of diet supplemented with organic selenium (OS, Selplex, Alltech, Kentucky USA) on survival, physiological, and immunological parameters of snub-nosed dart (Trachinotus blochii Lacepide, 1801) when challenged with Nocardia sp. bacteria or when exposed to toxic levels of environmental copper. The fish were fed two different diets containing 0% (D1,control diet) and 0.03% OS (D2) for 12 weeks before challenge. Cumulative mortality, phagocytic activity, and respiratory burst of head kidney leucocytes, and physiological parameters including moisture content and lipid accumulation in the liver, moisture content, and crude protein in the flesh were recorded. Results showed that the cumulative mortality of fish fed Se supplemented diet was lower than that of the fish fed the control diet when challenged with Nocardia sp. Survival rate was 100% in both treatment groups when exposed to copper only. Phagocytic activity and respiratory burst were higher in fish fed D2 (Se supplemented) compared to the D1 group when challenged with Nocardia sp. Phagocytic activity was higher in fish fed Se supplemented diet compared to the control group when exposed to environmental copper. No significant differences in the protein content, total lipid, and moisture in liver and flesh were recorded between the diet groups. Results indicated that supplementation of 0.3 g/Kg of OS (Sel-Plex) in the diet of snub-nosed dart is recommended to enhance fish survival and immunity when challenged with bacteria Nocardia sp. and environmental Cu toxicity exposure.
Type of Medium:
Online Resource
ISSN:
0792-156X
,
0792-156X
Language:
English
Publisher:
SAABRON PRESS
Publication Date:
2016
detail.hit.zdb_id:
291787-7
detail.hit.zdb_id:
2542938-3
SSG:
21,3
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