Study of fish meal substitution with earthworm in diet of rainbow trout (Oncorhynchus mykiss)

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Abstract

This experiment was carried out to evaluate the effect of earthworm (Eisenia fetida) in diet for
rainbow trout in a complete randomized design with 5 treatments in triplicates using 15 cages in a
pound for 8 weeks. Ten fish with average weight 120 g was stocked in each replication.The
earthworm (as fed) at the levels of 0, 25, 50, 75 and 100% was replaced with fish meal in rainbow
trout diet. Results showed that feed intake decreased significantly (P < 0.05) as earthworm
increased. The diets contain 25% and 50% earthworm showed no significane differences compared
to control for weight gain, specific growth rate and feed conversion ratio (P > b0.05). The chemical
composition analysis of fish meat showed that there were no significant effects between control and
25% and 50% earthworm in diet for dry matter, crude protein and ash, but fat content significantly
decreaed as earthworm increased (P < 0.05). This present study showed that the earthworm (Eisenia
fetida) can be used in rainbow trout diet up to 50% instead of fish meal.

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Iranian Scientific Fisheries Journal
Volume 24, Issue 3 - Serial Number 92
September and October 2015
Pages 59-67

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