The Effects of Feeding on Some Enzymes’ Activities and Growth Parameters in Rainbow Trout (Oncorhynchus mykiss) Fries

Fish were fed with live (Gammarus pulex) and wet foods (cattle spleen) per 2 and 4 days in order to determine the effects of feed on the activities of glucose 6 Phosphate Dehydrogenase (G6PD) and Carbonic Anhydrase (CA) enzymes and some growth properties of fry rainbow trout. Although the group fed with G. pulex per 2 days had the highest G6PD activity, the group fed with cattle spleen ones at two days showed the lowest enzyme activity. The effect of live feed given per 2 days on G6PD activity was significantly different for treatment groups (p< 0.01). There was no significant effect of feed on CA activity. On the other hand, the best result for Feed Conversion Ratio (FCR) was found in the control group (p< 0.05). Specific Growth Rate (SGR) and Survival Rate (SR) values were not different among the groups. At the end of the present study, it was concluded that both G. pulex and cattle spleen can be used as alternative food sources for rainbow trout fries. But, similar studies should be carried out for more clearly data about interactions between feeding and enzyme activities in fish.