The study was performed to examine the efficiency of hybrid napier grass (CO-3) mixed diet on growth performance of freshwater fish Ctenopharyngodon idella. Alive grass carp fingerlings were collected from commercial fish farm in Thanjavur from June 2015 to May 2016. Fishes were divided into two groups and acclimated for 7 days before feeding trial. The fishes were fed with control and experimental diet. The growth parameters such ABW, ABL, BWG and SGR were thoroughly studied adopting standard procedure. The result of the study clearly indicates that there was a significant variation in growth of control and experimental fishes. The fish fed with CO-3 grass mixed diet showed elevated level in body weight, body length, weight gain and specific growth rate. This study suggests that the CO-3 grass mixed diet is more suitable for grass carp aquaculture practice. Keywords: Hybrid Napier grass, CO-3, Ctenopharyngodon idella, Specific growth rate.

The present study is aimed to investigate the effect of Cynodon dactylon on the haematological parameters of freshwater fish Ctenopharyngodon idella. The study reveals that there was a slight variation noticed in total serum protein, globulin, albumin, glucose, cholesterol and triglycerides. There was a significant variation observed in Red blood corpuscles (RBC), White blood corpuscles (WBC), Haemoglobin (Hb), MCH, MCHC, PCV in the blood of grass carp fed with control and Cynodon dactylon mixed diet. The protein content of experimental fishes showed higher value than other components. The result of the study indicates that the fish are rich source of animal protein and moderate amount of cholesterol and triglycerides. Hence, it suggested that the fish consumed medicinal plants are suitable for human consumption. Keywords: Grass carp, Cynodon dactylon, Haematology, Haematocrit.

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