Comparison of the Growth Performance and Mortality in Abant Trout (Salmo trutta abanticus Tortonese, 1954) and Rainbow Trout (Oncorhynchus mykiss Walbaum, 1792) under Farming Conditions

Authors: İRFAN UYSAL, ATİLLA ALPBAZ

Abstract: This experiment was conducted between 15th February 2000 (day 1) and 31st January 2001 (day 350) at the DSI-Gölköy Fish Production Station, Bolu (Turkey). Abant trout larvae obtained from eggs of wild Abant trout broodstocks in Lake Abant and rainbow trout larvae obtained from eggs of the hatchery broodstocks in Gölköy Fish Production Station were used. Trials I and II involved eight groups (four Abant and rainbow trout experimental groups, and four Abant and rainbow trout parallel groups). A total of 1784 larvae was used in both the trials. At the end of the experiment, although the mean wet weight of Abant trout was found to be around 5 g, the maximum increase in weight was found in rainbow trout (between 116.202 and 173.315 g in trials I and II). Final mean condition factors (CF) differed between the Abant and the rainbow trout groups (P < 0.001). The specific growth rate (SGR) exhibited significant differences between trials I and II for the Abant and rainbow trout groups (P < 0.01) (P < 0.05). It is concluded that the desired level of growth performance of Abant trout was not obtained in tank conditions. In contrast, the growth and survival rate of rainbow trout were clearly better than those of Abant trout.

Keywords: Abant trout (Salmo trutta abanticus), Rainbow trout (Oncorhynchus mykiss), Growth, Mortality

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