Golden apple snail Pomacea canaliculata Lam. as feed for freshwater prawn Macrobrachium rosenbergii de Man
2002
Lansangan, V.A. | Cagauan, A.G. (Central Luzon State Univ., Science City of Munoz, Nueva Ecija (Philippines)). Coll. of Fisheries Tayamen, M.
Five diets were fed to freshwater prawn larvae (PL20) in aquaria as follows: 1-commercial prawn feed; 2-fresh ground snail; 3-snail meal (60%) + rice bran (40%); 4-snail meal (60%) + rice bran (30%) + shrimp meal (10%); 5-snail meal (60%) + rice bran (20%) + fish meal (10%) + shrimp meal (10%). The chemical compositions of the different diets were analyzed. Growth, production, survival and food conversion were evaluated in 45 days. Chemical composition showed that the commercial prawn feed (diet 1) had the highest crude protein (CP) level of 37% followed by fresh snail (diet 2) (31% CP), 21% CP in diets 4 and 5, and lowest in shrimp meal + rice bran (diet 3) (17% CP). Crude fat contents were about 4% in diets 1 and 2; about 10% in diets 3 and 4; and 12% in diet 5. Crude fiber levels in the five diets ranged from 2.8-4%. Ash content was highest in the fresh snail (68%), followed by the commercial prawn diet (16%) and lowest in the other three diets (about 9%). The specific growth rates (SGR) of M. rosenbergii were significantly higher in diet 5 (3.92%) comparable with diets 4 (3.92%) and 1 (3.74%) than in diets 2 and 3 (3.34-3.39%). These results indicate that feeds with attractant like shrimp meal seemed to be more appetizing to the prawns except for diet 3. The fresh snail, although acceptable to M. rosenbergii, did not seem attractive to the prawn. Although the fresh snail had high crude protein level of 31%, results showed that growth of M. rosenbergii was not comparable with diets 1, 4 and 5. The significant high SGRs levels of M. rosenbergii in this indoor experiment obtained in diets 1, 4 and 5 were insufficient for the prawn to reach desirable harvest weight possibly due to the absence of other growth factors that are present in pond condition. Food conversion efficiency ranged from 50-57% in diets 1, 4, and 5 whereas 39% in diet 3, and lowest in diet 2 (25%). The survival rates after 45 days ranged from 50-60 % except in the fresh snail diet (45%)
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