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EFFECT OF FROZEN Daphnia magna DIET MIXED WITH PROBIOTIC PROTEXIN ON GROWTH AND SURVIVAL OF RAINBOW TROUT (Onchorhynchus mykiss) FRY REARED UNDER CONTROLLED CONDITIONS

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Author(s): S. AHMADVAND

Journal: Online Journal of Animal and Feed Research
ISSN 2228-7701

Volume: 02;
Issue: 01;
Start page: 34;
Date: 2012;
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Keywords: Probiotic | growth | survival | rainbow trout (Oncorhynchus mykiss)

ABSTRACT
Effect of probiotic Protexin was experimentally tested on growth and survival of rainbow trout fry reared under controlled conditions. Experiments to determine the effect of different levels of probiotic (2×104 (T1), 2×105 (T2) and 2×106 (T3) CFU/g-1) on growth and survival rates of rainbow trout in comparing with those of control diet containing no probiotic were carried out under laboratory conditions. In this trail, frozen Daphnia magna was considered as a basal diet for fry feeding. Rainbow trout offered the control diet exhibited the same growth and feed utilization with all experimental treatments, and no significant differences (P>0.05) in growth were observed among fish groups fed various levels of the probiotic. There was no effect of probiotic inclusion level on water quality. There was no effect of probiotic supplementation on survival at the end of experiment in T1 and T3, but survival rate in T2 was higher than other groups, significantly (P
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