International Journal of Fisheries and Aquatic Research

Authors
Bimlendu Kumar Mishra, Monowar Alam Khalid, Shyam Narayan Labh

Abstract
Fishes are cold blooded affected by surrounding water temperature which directly influences its body temperature, growth rate, food consumption, and other physiological activities. Therefore, this study was conducted to investigate the effect of varied water temperature on growth performance and protein profile on head-kidney of Labeo rohita (Hamilton 1822) during climate change study. Four hundred fifty fingerlings of major carp Labeo rohita (3.17 ±0.13 g) were introduced at the rate of 25 fish per tank in eighteen glass tanks (14”x12”x36”) for this experiment, divided into six treatments and the temperatures were fixed as T1 (18°-20°C), T2 (20-22°C), T3 (22-24°C), T4 (24-26°C), T5 (26-28°C) and T6 (28-30°C). To maintain the varied climatic conditions of aquatic environment initial temperature fixed in the beginning changed and increased 1°C after a month in all the tanks e.g. in T1 first month was fixed as 18°C followed by 19°C and in last month as 20°C respectively. The experiment was conducted for 3 months and during rearing regular feed were given at the rate of 3% of its body weight and three times (7 am, 12 pm and 5 pm) daily. Temperature, pH and Dissolved Oxygen were monitored on regular and daily basis. At the end of feeding sampling were done for growth and protein profile from the head kidney to understand the effect of temperature on physiology and growth of carp. Average weight gain, specific growth ratio (SGR) found significant high (P<0.05) in T4 and T5 fed group while decreasing trends were observed in feed conversion ratio (FCR). Similarly, total protein, albumin, globulin and the ratio of albumin and globulin found significantly increasing (P<0.05) in higher the temperature (T4 & T5) and decreasing in lower the temperature (T1 & T2). Similarly, no significant difference was observed in FCR and total protein in head kidney of fish fed in T6 group. In conclusion, it was clear that temperature is prime factor for fish growth and optimum temperature (T4 -T5) is needed to maintain for proper growth and physiology of carp in a particular climatic condition.