Optimum protein requirements for the intensive culture of Labeo rohita (Hamilton) in glass aquaria

Abstract

To study the optimum protein requirements for the intensive culture of Labeo rohita (Hamilton) reared in glass aquaria during April to July 2009, three iso-caloric pellet feeds were prepared from locally available feed stuffs (rice protein, rice bran and wheat bran) of different protein levels such as 35%, 38% and 40% (dietary protein levels) of 2 mm dia. These feed stuffs were tested for proximate (bio-chemical composition) analysis and the amount of protein was found to be 13%, 12% and 40% respectively. Each feed was supplied at a rate of 8% of the body weight of fish twice a day. The results of the various growth parameters like suitability of protein level requirement, specific growth rate, mean total weight gain, percentage weight gain, feed conversion ratio, survival rate and production showed significantly (p<0.05) highest growth and production in feed B (38% gross protein) followed by feed C (40% gross protein) while significantly (p<0.05) lowest growth and production was recorded for feed A (35% gross protein). The water quality parameters were recorded throughout the study period and were found within the suitable ranges of fish culture. It is therefore concluded that the pellet feed with 38% (gross protein) is the optimum protein level for the better growth and production of major carp, Labeo rohita.