Length Weight Relationship Condition Factor And The Food Of Juvenile Nile Tilapia (oreochromis Niloticus L.) In Lake Hawassa And Lake Zwai Ethiopia

Length - weight relationship, condition factor and the food of juveniles of O. niloticus in lakes Hawassa and Zwai were studied from monthly samples taken during March to August 2016. Total length (TL, cm) and total weight (TW, g) of both juvenile populations were curvilinearly related (ANOVA, P0.05) between the two populations. Mean ± SE relative condition factor (RCF) was 1.02 and 1.01 respectively, for Hawassa and Zwai populations. Mean RCF value (>1) suggested that both juvenile populations are in good growth condition. Stomach content analysis (Hawassa n=185, Zwai n=200) revealed that both populations feed on a variety of organisms belonging to phytoplankton, zooplankton, insects, nematodes and unidentified animals. Both frequency of occurrence and numerical abundance method showed that zooplankton were the most important food of both juvenile population and the least nematodes, in that order were the most important food items categories frequency of occurrence and numerical abundance showed that the relative importance of animals decrease whereas that of phytoplankton increases as the size (TL) of the juveniles increases (TL: 4cm to14.5cm).

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