Effect of Adding Microalgae Chlorella sp. on Some Biological Parameters and Proximate Analysis of Common Carp Cyprinus Carpio L.

Backgrounds: Chlorella is used popularly as dietary supplements. Various studies and researches have been done regarding the intervention of microalgae as foods since a long time ago. And, it is found that Chlorella have potential health benefits, in terms of their protein and antioxidant content. Thus, with an objective of formulating nutritional supplements, this algae are being harvested in artificial ponds on a large scale and could be used in different way such as feed supplemet or a replacement with a source of protein. Objectives: evaluate the effect of feed containing various ratios of Chlorella on some biological parameters in common carp. Methods: The experiment was conducted for 105 days and for these purpose 200 fingerlings common carp C. carpio L. were brought from a local aquarium fish in Iraq. Mean initial weight was 35.7g. The fish were acclimated to laboratory conditions and fed with control pellets (29% protein) prior to the feeding trials for 21 days in fish laboratory/ Dept. of Animal Sciences/ College of Agricultural Sciences/ University of Sulaimani. In T1 fish were fed a diet with 0 Chlorella gm/kg diet,while in T2, fish were fed a diet with 2.5 Chlorella gm/kg diet, T3 represents the third treatment, in which fish were fed on a diet with 5 Chlorella gm/kg diet, and in T4 fish were fed a diet with 7.5 Chlorella gm/kg diet. Results: The present study clearly showed that feeding algae as a feed additive to fish remarkably change the studied biological parameters, in Hepatosomatic index all treatments were significantly differ than the control, Spleenosomatic index the control and T4 were higher significantly than others, in Gonadosomatic index the T2 and T4 were differ significantly while T4 was significantly higher than other treatments in Kidneysomatic index. Fish weight without viscera and weight without viscera & head differ significantly among treatments with the addition of Chlorella the diet. Conclusion: Chlorella can be used as protein rich sources to replace fishmeal or as feeding additives in the diets of common carp fingerlings with different levels. Products that are safe and of good quality.