The Israeli Journal of Aquaculture - Bamidgeh 53(2), 2001, 80-83

THE INFLUENCE OF DAILY FEEDING FREQUENCY
ON GROWTH AND FEED CONSUMPTION OF
RAINBOW TROUT FINGERLINGS
(ONCORHYNCHUS MYKISS) REARED AT 18.5-22.5C

Nadir Basçinar¹, Ibrahim Okumus¹, Nimet Selda Basçinar² and Hacer Emiral Saglam¹

1 KTU Faculty of Marine Sciences, Dept. of Fisheries, TR-61530 Trabzon, Turkey
2 Ministry of Agriculture and Rural Affairs, Central Fisheries Research Institute, Sana, Trabzon, Turkey

(Received 24.9.00, Accepted 7.6.01)

Abstract

Feed consumption, growth and feed conversion ratios were studied in rainbow trout (Oncorhynchus mykiss) juveniles (mean weight 9.0 3.1 g) fed two, three or four times daily and reared at 18.5-22.5C. The fish reached final mean weights of 26.8-31.6 g over the 40-day trial and growth rates (SGR) ranged 2.57-3.01% per day. Fish fed four times a day had a significantly higher SGR and final mean weight than those fed two or three times each day. Similarly, the condition factors of the groups fed three or four times a day were higher than that fed twice (p<0.01). Daily feed consumption rates (3.1-3.7% of the body weight) increased significantly with increasing feeding frequency (p<0.05), while differences in feed conversion ratios (1.06-1.16) were significant only between the groups fed two and three times (p<0.01). At water temperatures of 18.5-22.5C, rainbow trout juveniles fed four times a day grow faster than those fed two or three times.

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