Growth of rainbow trout fed a diet supplemented with earthworms,after chemical treatment |
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| Authors: | J óscar Pereira Emídio F Gomes |
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| Institution: | (1) Department of Animal Science, Universidade de Trás-os-Montes e Alto Douro, Campo Universitário, 5000 Vila Real, Portugal;(2) Biomedical Sciences Institute, Oporto University, P-4000 Porto, Portugal |
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| Abstract: | Whole frozen earthworms (Eisenia foetida) were evaluated as a partial replacement for commercial pellets for rainbow trout, Oncorhynchus mykiss. Earthworms were  blanched and treated with concentrated sodium chloride (10%). Fish were submitted to four treatments: control fish were fed with a commercial diet and three groups of fish were fed with diets partially supplemented with earthworms. All fish showed the same appetite for the earthworm-supplemented diets as for the control diet during the course of the experiment (8 weeks). No significant differences (p > 0.05) were detected in the mean final body weights of all groups of fish. A significant decrease was found in the whole-carcass lipid content of fish fed diets containing 25%, 50% and 75% frozen earthworms. The results on growth rate and feed utilization efficiency of fish fed diets containing high levels of whole frozen worms suggested an adverse effect of worm incorporation, probably due to dietary energy/protein imbalance. |
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| Keywords: | Diets Earthworms (Eisenia foetida) Feeding experiments Rainbow trout (Oncorhynchus mykiss) |
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