Author(s): Bimlendu Kumar Mishra, Monowar Alam Khalid and Shyam Narayan Labh

Abstract: Temperature is one of the environmental factors with greatest influence on the growth performance of animals. Thus, a 12 week study was conducted to investigate the effects of different water temperature on length gain, feed conversion ratio and protein profile in brain of Indian major carp rohu (Labeo rohita Hamilton 1822) in the wet laboratory of Fisheries Development and Training Center, Janakpurdham, Nepal. Altogether six treatments (T₁, T₂, T₃, T₄, T₅ and T₆) of varied temperaturesas18-20 °C, 20-22 °C, 22-24 °C, 24-26 °C, 26-28 °C, 28-30 °C were fixed with the help of aquarium thermometer in 18 aquaria (three replicates). Natural climatic condition was at that time around 17-18 °C hence in T1 tank 18 °C was fixed in the beginning and after a month it was changed to 19 °C and in final month the temperature was fixed as 20°C, thus this tank was considered as control. Similar temperature variations were applied in other treated tanks and after 90 days of feeding final sampling were done. Nigella sativa (Kalaunji) a medicinal plant seed was prepared using ethanol extract of Kalaunji along with other ingredients and fed at the rate of 3% of fish body weight wet twice a day. Labeo rohita attained significantly higher body length (10.59±0.06 cm) and length gain % (151.28±0.68) under water temperature range of 24-26 °C fed in fish group of T4 aquaria. The fish reared in water having temperature between 24-26 °C showed cent per cent survival rate and the best FCR value (1.18±0.13). Similarly, total protein in brain (15.98±0.41g) was significantly higher in T4 group under water temperature range of 24-26 °C. Thus, it has been concluded that water temperature ranging from 24-26 °C seemed to be the most effective for rearing of Labeo rohita proved for better growth and healthy carp. Aquafarmers can be benefitted by using this technique.

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