MANIFESTATION OF GROUP EFFECT IN RAINBOW TROUT (Oncorhynhus mykis, Walbaum) UNDER STRESS CONDITIONSJournal: Fisheries Science of Ukraine (Vol.19, No. 1)
Publication Date: 2012-03-25
Authors : Podoprigora V.;
Page : 61-66
Keywords : stress factors; trout; hatchlings; mortality; group effect;
The main task of the study was identifying differences in growth parameters of individual trout hatchlings handled alone and in a group. Hatchlings were divided into two groups. The first group of hatchlings of various body length and weight was placed to 25 aquaria, a single fish in each. Another group was placed in three equal aquaria. Body weight and mortality have been recorded. Being in a group was found to compensate effects of stress factors. Isolation is a stress for trout hatchlings; combined with other stress factors, it can be a cause of death. These results indicate close connection between theories of group effect and stress.
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