Application of earthworm (Eisenia fetida) in diet for rainbow trout (Oncorhynchus mykiss)
2012
Allameh, Sayyed Kamaleddin | Azarbayejani, A.R. | Mohammadi Arani, M. | Sepahdari, A.
This experiment was carried out to evaluate the effect of earthworm (Eisenia fetida) in diet for rainbow trout in complete random design for 6 weeks. Ten fish with mean 120 g was stocked in each replication.The earthworm at levels of 0, 25, 50, 75 and 100% was replaced (as fed) with fish meal in rainbow trout diet. The feed intake by weekly and weight gain of fishes by monthly were measured. Feed intake, weight gain, specific growth rate and feed conversion ratiothe were colculated, and the samples of fish meat were analysed for chemical composition including dry matter, crude protein, fat and ash. Results obtained 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>0.05). 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 decreaed as earthworm increased significantly (P<0.05). This experiment showed that earthworm (Eisenia fetida) can be used in rainbow trout diet up to 50% instead of fish meal.
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