Turkish Journal of Veterinary and Animal Sciences

The Effects of Different Feeding Rates on Growth and Feed Conversion of Rainbow Trout ( Oncorhynchus mykiss) Reared in Sea Cages in Black Sea (Sinop), Turkey

Serap USTAOĞLU, Recep BİRCAN Ondokuz Mayıs Üniversitesi, Sinop Su Ürünleri Fakültesi, Sinop - TÜRKİYE Abtract: In the research, rainbow trout with a mean weight of 123 g were fed 1.5-1.8% (I. group) and 2.25-2.7% (II. group) of the body weight and adlibitum (III. group), respectively to investigate the effects of different feeding rates on growth and feed con-version. At the end of the experiment, final average weights of 411.3±10.08 g, 484.2±14.23 g and 513.5±14.93 g, have been obtained, respectively. The difference between the I. group and II. group, and also the I. group and III. group was found significant (p<0.05) while the difference between the II. group and III. group insignificant (p>0.05) according to the results of variance analy-sis and Duncan tests. Daily growth rates in the groups were obtained as 3.12%, 3.86% and 4.18%. Feed conversion rates of 1.10, 1.54 and 1.92 were obtained in the experimental groups, respectively. It has been concluded that feed conversion in the I. group fed on 1.5-1.8% body weight, was best. That was followed by the II. and III. group. At the end of the experiment, condition factors of 1.29-0.03, 1.33±0.03 and 1.38±0.04 were determined while mortality rates of 4.17%, 13.75% and 17.92% were recorded, respetively.

Key Words: Oncorhynchus mykiss,feeding rates, growth, feed conversion ratio.

Turk. J. Vet. Anim. Sci. 1998; 22: 285-292.
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