Growth Indices of Rainbow Trout (Oncorhynchus mykiss) Larvae Fed with Live Food and Artificial Diet

<p>The present experiment was carried out to evaluate the individual and mixed effect of live and artificial food on the growth performance of rainbow trout (<em>Oncorhynchus mykiss</em>) larvae. The triplicate treatments were divided into four sets. The first group was fed a commercial starter food; the second group was fed on live <em>Artemia salina </em>nauplii (for 3 days); the third group was fed on live <em>Artemia salina </em>nauplii (for 7 days); and the last group was fed on a combination of live <em>Artemia </em>nauplii (5% of food) and the commercial starter food. The larvae were fed four times daily, for 1 week. After 1 week, the fish of all groups were shifted to the commercial diet for an additional 3-weeks period to determine the impact of any differences in weight of fish. The result of the present study showed that those larvae fed with combination of <em>Artemia </em>nauplli and a commercial starter food grew significantly faster than other groups for 4 weeks. Larvae fed with other composition were similar in length and weight (P>0.05). Survival rates of the trout larvae ranged 86-96% after 1 week and 67-84% after 4 weeks. Larvae survival after 1 and 4 weeks were significantly higher (P<0.05) in trout larvae fed only on <em>Artemia </em>nauplii (treatments 2 and 3) than other treatments. The body chemical composition analysis of trout larvae showed only small differences, with the exception of the crude protein and lipid at 4 weeks. The data were analyzed to determine significant differences among treatments by one-way ANOVA. (Statistica v.9, StatSoft Inc.).</p>

Abstract licence: CC BY-NC-ND

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