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    Effects of Canola and Safflower Oil Supplementation in Diets, on Growth Performance and Fatty Acid Composition of Russian Sturgeon (Acipenser gueldenstaedtii Brandt, 1833)
    (Israeli Journal Of Aquaculture-Bamidgeh, 2016) Tiril, S. Ustaoglu; Dernekbasi, S.; Karayucel, I.; Kerim, M.; Akyuz, A. Parlak
    The aim of this study was to determine the impact on growth performance and muscle fatty acid composition, of replacement of 50% fish oil (FO) with canola oil (CO) and safflower oil (SFO) in the diets of Russian sturgeon (Acipenser gueldenstaedtii). Two isoproteic (48%) and isolipidic (12%) diets were formulated combining two oil sources (50% fish oil + 50% canola oil or 50% fish oil + 50% safflower oil). The diets were fed to apparent satiation to triplicate groups for 15 weeks, twice a day. No significant differences were observed between the experimental groups fed CO and SFO diets in terms of weight gain, specific growth rate, feed conversion ratio, and protein efficiency ratio. The experimental groups fed CO and SFO diets did not show significant differences in terms of protein, lipid, ash, and moisture content in their muscle. There were no significant differences in muscle between total n-3 fatty acids but total n-6 fatty acids were significantly higher in SFO group (24.90%) than in CO group (21.30%). Total n-6 fatty acids were also higher than (20.43%) at the start. In conclusion, 50% replacement of FO by CO or SFO in Russian sturgeon diets had no negative effect on growth performance, feed efficiency and fatty acid composition in the muscle of this species.
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    Effects of different feed restriction periods on the growth and fatty acid compositions in juvenile rainbow trout (Oncorhynchus mykiss)
    (Iranian Fisheries Science Research Inst-Ifsri, 2020) Baki, B.; Ozturk, Kaya D.; Kerim, M.; Eyuboglu, B.
    The aim of this study was to determine the effect of different feed restriction periods on the growth performance as well as the biochemical and fatty acid compositions of fillet in rainbow trout (Oncorhynchus mykiss). Fish with an average initial weight of 64.80 +/- 7.41g were used in the study. The trial lasted 60 days and 4 different feeding diets were alternately applied to the fish. The control group (C) was fed continuously throughout the trial while the other groups were fed 2 days starvation 1 day(-1) feeding (2D), 4 days starvation 1 day(-1) feeding (4D), and 6 days starvation 1 day(-1) feeding (6D). The average weight of the fish at the end of the trial was 219.78 +/- 31.32g (C), 168.41 +/- 21.44g (2D), 116.60 +/- 12.28g (4D), and 87.64 +/- 12.99g (6D), respectively. The fillet protein values were determined as 20.85 +/- 0.69 (C), 19.82 +/- 0.68 (2D), 18.19 +/- 0.79 (4D), and 18.42 +/- 1.21 (6D), respectively. The lipid values were 6.18 +/- 0.40 (C), 3.35 +/- 0.41 (2D), 2.26 +/- 1.63 (4D), and 1.94 +/- 0.63 (6D), respectively. The lipid lean(-1) body mass values were 0.27 +/- 0.05 (C), 0.16 +/- 0.03 (2D), 0.08 +/- 0.05 (4D), and 0.11 +/- 0.03 (6D), respectively. Regarding the analyses conducted on fish muscle tissues, the differences between the control group and feed restriction groups were statistically significant in terms of saturated fatty acids, monounsaturated fatty acid, polyunsaturated fatty acid, Omega-3, Omega-6, and Omega-9 values. In conclusion, it has been determined that the different feed restriction periods in the feeding of rainbow trout had an effect on the duration of reaching the marketable weight, feed conversion rates, meat yield, fillet protein, and fat ratio values and increased reaction to feed.
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    Evaluation of safflower meal as a protein source in diets of rainbow trout [Oncorhynchus mykiss, Walbaum, 1792)]
    (Wiley, 2015) Tiril, S. Ustaoglu; Kerim, M.
    The effects of different levels of safflower meal (a residue of the plant oil extraction process) in diets of rainbow trout (Oncorhynchus mykiss) on growth performance, nutrient digestibility and body composition were investigated. Four different diets containing 0% (Control group), 10% (Diet 1), 15% (Diet 2) and 20% (Diet 3) safflower meal were formulated for the fish with a mean weight of 132.70 +/- 0.75g fed for 70days. At the end of the experiment, there were no significant differences among dietary treatments for weight gain, specific growth rate and feed conversion ratio (P>0.05). There were also no differences in the digestibility of crude protein and crude lipid between groups (P>0.05). Supplementation of safflower meal in the diets also had no adverse effects on body composition. The results indicate that safflower meal is a promising feed ingredient and can be used up to a concentration of 20% in the rainbow trout diet with no adverse effects on growth performance, nutrient digestibility or body composition.