Feed efficiency of white leg shrimp (Litopeneaus vannamei) in co-culture with gut weed (Enterormorpha sp.) and blanket weed. (Cladophoraceae)
ABSTRACT: Study on the possibility of feed reduction in co-culture of white leg shrimp (Litopeneaus vannamei) with gut weed (Enteromorpha sp.) and blanket weed (Cladophoracea) was performed consisting of 7 treatments with triplicates. Shrimps was mono-cultured and fed commercial feed at libitum as a control treatment, other 6 treatments; shrimps were co-cultured with either gut weed or blanket weed and fed at the rates of 75%, 50% and 25% feed ration of the control. Shrimp postlarvae with mean weight of 0.036 g were stocked in the 100-L plastic tanks with density of 20 PL/tank (200 PL/m3) at salinity of 10 ppt. In co-culture treatments, 100 g of gut weed or blanket weed was placed in each tank and maintained during 72 days of culture. Results showed that survival of shrimp was not affected by the reduction of feeding rate. Growth performance and yield of shrimp in co-cultured fed 50 or 75% satiation were equal to or significantly higher (p<0.05) than those in the control. Application of co-culture, feed cost could be considerably reduced, from 45.5 to 64.9% as well as the concentration of TAN and NO2– were much lower compared to mono-culture. Moreover, red coloration after cooking was markedly darker in shrimps co-cultured with gut weed and blanket weed. These results indicated that coculture of white leg shrimp with gut weed or blanket weed might reduce up to 50% feed ration in shrimp culture and maintain better water quality.
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