Effect of dietary protein levels on growth of Penaeus stylirostris juveniles |
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| Authors: | C Baillet G Cuzon M Cousin & C Kerleguer |
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| Institution: | Fremer, BP 7004 Taravao, Tahiti, French Polynesia |
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| Abstract: | The shrimp Penaeus stylirostris is currently produced on a commercial scale in Tahiti and New Caledonia. Both super-intensive (80 animals m?2) and semi intensive (25 m?2) systems are promoted. Locally produced commercial feed contains 380–400 g kg?1 crude protein (CP) without special consideration for environmental impact. The need for a 'low pollution' diet implies reconsideration of the optimum dietary protein level for this species. Under experimental conditions, six isoenergetic practical diets ranging from 270 g kg?1 to 440 g kg?1 CP were formulated and fed to satiation for 30 days to juvenile P. stylirostris ; average growth rates were between 5.5 and 7.5 g per month with survival rates > 90%.
The lowest protein levels 270–310 g kg?1, gave significantly ( P < 0.05) poorer growth (5.5 g per 30 days) than was observed with 330–430 g kg?1 CP; 330 g kg?1 CP may be recommended, and as it is lower than levels in diets used currently, there is a possibility of reducing nitrogenous waste. In addition to growth response, protein efficiency ratio, protein productive value and food conversion (feed/gain) all supported a recommended dietary protein level of 330 g kg?1. Future prospects for practical feeds with even lower CP levels are considered. |
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| Keywords: | nutrition protein shrimp |
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