INFLUENCE OF DIETARY LIPID ON SURVIVAL, GROWTH AND MOULTING STRATEGIES OF PENAEUS INDICUS (MILNE EDWARDS) POSTLARVAE

摘要

A study was undertaken to find out the influence of dietary lipid level on survival, moulting, growth and bioenergetic parameters in postlarvae of Penaeus indicus. To begin with four experimental pellet diets (F1 through F4) having 40% crude protein with 1, 2, 3 and 4% lipid were prepared. A diet with same protein level, but devoid of lipid was also prepared and used as the control (C). The shrimps larvae were fed on control and experimental diets to satiation for a period of 30 days. The survival ofP. indicus was 100% when fed on control (C), F1 and F2 diets against 90% for those groups fed on F3 and F4 diets. The moulting rate was high (7.6) in F1 diet fed shrimps; whereas, it was low (5.4) in control diet fed individuals. Similarly, the averageinter moult period was also high (5.0 days) in P. indicus fed with control diet (C) and lower (3.9 days) in F1 diet fed shrimps. The biochemical composition such as protein content was high (56.2%) in F1 diet fed shrimps; whereas, it was low (51.4%) in control diet fed shrimps and in F2, F3 and F4 diet fed groups it was 54.8, 53.3 and 53.8% respectively. The lipid content of the different diet fed shrimps varied from 5.2 to 7.0%. The Specific Growth Rate of control diet fed P. indicus was low (8.50%) and it was high (11.46%) for those shrimps received F1 diet. The consumption rate of control diet fed P. indicus was 123.36 mg g~(-1) day~(-1) and it reduced to a range of 64.49 ± 0.692 mg g~(-1) day~(-1) to 85.54 ± 1.139 mg g~(-1) day~(-1) in experimental diet fed groups. The absorption efficiency ranged between 79.04% and 89.04% in control and experimental diets fed groups. The gross production efficiency was low in control diet fed shrimps (13.01%) and it was high (25.28%) in F1 diet fed individuals.