Spring Feeding Habits by Escaped Cage Rainbow trout, Oncorhynchus mykiss (Walbaum, 1792) in the Seyhan Dam Lake (Adana/Turkey)

Abstract

In this study were the stomach contents of 50 Rainbow trout were caught by gill nets in the Seyhan Dam Lake during the period from March-May 2007 and March-May 2008. Organisms, obtained upon analysing the stomach contents were counted to using method of IRI (Index of Relative Important). Percentages of food items consumed by trout were, in females 0.10% Fish, 6.90% Terrestrial Invertebrates, 17% Aquatic Invertebrates, 26% Microalgae and 50% of others including stones, wood, scales and egg while in males 0.20 % Fish, 5.27 % Terrestrial Invertebrates, 16.92% Aquatic Invertebrates, 19.90% Others (stone, wood, scale and egg) and 57.71% microalgae. In addition, 29 food items including 16 plant organisms, and 13 were animals were found in the stomach content of the rainbow trout