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    Effects of Two Seaweeds (Ulva lactuca and Enteromorpha linza) as a Feed Additive in Diets on Growth Performance, Feed Utilization, and Body Composition of Rainbow Trout (Oncorhynchus mykiss)
    (Kafkas Univ, Veteriner Fakultesi Dergisi, 2009) Yildirim, Oender; Ergün, Sebahattin; Yaman, Seval; Turker, Ali
    In the present study, it was aimed to determine the effects of diet containing two seaweed species, Ulva lactuca and Enteromorpha linza, on the growth performance, feed utilization and body composition of rainbow trout. Two experimental diets were formulated with the usage of 10% U. lactuca meal and 10% E. linza meal in feed and control group had no seaweed ingredients. Each experiment was triplicate and each group had fourteen fish specimens with an average weight of 32.96 +/- 0.29 g. Fish were hand fed three times per day for 60 days. Significant differences were determined in weight gain, specific growth rate, relative growth rate and feed utilization between experimental and control groups ( P<0.05). Fish fed with the diet containing 10% E. linza meal had the poorest feed utilization. The survival rate ranged from 96% to 98% in all groups during trial period. Apparent net protein retention, protein efficiency rate, daily dry feed intake and total feed intake were significantly lower in fish groups which fed with the diet containing U. lactuca and E. linza than control group (P<0.05). The final levels of crude protein, crude lipid and crude ash were in higher rates in the body composition all the groups compared when compared to the initial level (P<0.05). The results of the experiment revealed that a diet with U. lactuca and E. linza inclusion at 10% levels resulted in a poorer growth and feed utilization for rainbow trout when compared to those of control group. Hence, more defined experiments seem to be necessary in order to determine the optimum dietary inclusion level of these seaweeds in rainbow trout diets.
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    Öğe
    Growth performance and feed utilization of Tilapia zillii (Gervais, 1848) fed partial or total replacement of fish meal with poultry by-product meal
    (Academic Journals, 2009) Yildirim, Oender; Turker, Ali; Ergün, Sebahattin; Yigit, Murat; Gulsahin, Anil
    The aim of this study was to investigate the growth performance, feed utilization and body composition of Tilapia zillii fed diets where poultry by-product meal replaced fish meal protein at 0, 50 and 100% levels in high energy diets. This is the first research study conducted to evaluate poultry by-product as an alternative feed source for T. zillii. Experimental diets were prepared isonitrogenously and isocalorically (55% CP; 20.5 kJ GE g(-1)). Ninety fish (mean weight 2.45 +/- 0.04 g) were cultured in glass aquariums containing brackish water (25 C average temperature and 11 parts per thousand salinity) for a period of 45 days. At the end of the trial, relative growth rate, specific growth ratio and daily dry protein intake in fish fed diet 1 (control) and 2 (50% poultry by-product meal inclusion) were similar and appeared significantly (p < 0.05) better than the fish fed diet 3 (100% poultry by-product meal inclusion). Feed conversion ratio was significant different among diet 2 and diet 3 (p < 0.05). No differences were found among diets, in terms of fish whole body proximate composition. The results of this study show that T. zilli can be cultured in brackish water with feeding a diet containing 50% poultry by-product meal without any adverse effect on growth performance of fish.