Food Intake and Feed Conversion Ratios in Abant Trout (Salmo trutta abanticus T., 1954) and Rainbow Trout (Oncorhynchus mykiss W., 1792) in Pond Culture

Authors: İRFAN UYSAL, ATİLLA ALPBAZ

Abstract: This study was carried out at DSI-Gölköy Fish Production Station in Bolu and lasted for 350 days. Food consumption (FC) and feed conversion ratios (FCR) in Abant and rainbow trout in pond culture were compared. Abant trout larvae obtained from eggs of wild Abant trout broodstocks in Lake Abant and rainbow trout larvae obtained from eggs of the cultured broodstocks in Gölköy Fish Production Station were used in this study. Trial I involved 4 groups (2 Abant and rainbow trout experimental groups and 2 Abant and rainbow trout parallel groups). Two hundred and thirty-six larvae were in each group; a total of 944 Abant and rainbow trout larvae were used. Trial II involved 4 groups (2 Abant and rainbow trout experimental groups and 2 Abant and rainbow trout parallel groups). Two hundred and ten larvae were in each group; a total of 840 Abant and rainbow trout larvae were used. In both trials, a total of 1784 larvae were used. After the first feeding, at the end of day 350, 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. The final mean wet weight of rainbow trout was between 116.33 and 173.42 g in trials I and II. Abant and rainbow trout were fed ad libitum until they weighed 5 g. FC and FCR in Abant trout were not calculated because at the end of the study, the mean live weight of Abant trout was not over 5 g. FCR values increased with water temperature and the best FCR value (1.12) was calculated in the rainbow trout parallel group, in trial II in August. There was a significant difference in FCR in the rainbow trout groups in trials I and II (P<0.05). In conclusion, the desired level of growth performance of Abant trout was not obtained in pond culture. The growth. food consumption and feed conversion ratios of rainbow trout were clearly better than those of Abant trout.

Keywords: Abant trout, Salmo trutta abanticus, Rainbow trout, Oncorhynchus mykiss, Food Intake, Feed Conversion Ratio

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