Experimental Studies on Polyculture of Chinese Shrimp with Constricted Tagelus

Wang Jiqiao\ Li Deshang\ Dong Shuanglin\ Wang Kexing \ Tian Xiangli (Ocean University of Qingdao, Qingdao 266003, China)  

Optimum stocking performance, and productivity of the intensive polyculture of Chinese shrimp (\%Penaeus chinensis\% Osbeck) with constricted tagelus (\%Sinonovacula constricta\% (Lamarck)) were studied with four land based enclosures of each 5 0 m×5 0 m×1 8 m set in a 1 7 hm\+2 seawater pond The constricted tagelus juveniles (5 40cm± 0 35cm in shell length) were stocked into the enclosures with 6 0 Chinese shrimp juveniles/m\+2 at a rate of 0, 10, 15 and 20/m\+2 and reared for 138 days The shrimp were fed with pelleted feed (45% of crude protein) The final body length (8 80 cm), body weight (8 43 g), suruival rate (74 0%) and yield (413 6 kg/hm\+2) of the shrimp were 1 6%, 7 7%,13 8% and 35 4% higher in the enclosure in which the constricted tagelus was stocked at a rate of 20 clams/m\+2 than those in the enclosure stocked at 0 clam/m\+2, respectively In the enclosure at 10 clams/m\+2, the survival rate and net yield of the constricted tagelus were 90 4% and 316 kg/hm\+2, respectively As the stocking density of the constricted tagelus increased to 20 clams/m\+2, survival rate and net yield of the constricted tagelus reduced to 78 3% and 92 kg/hm\+2, respectively In the experimental conditions, productivity of the pond for Chinese shrimp was 1 24 g/(m\+2·d) and the optimum stocking density of the constricted tagelus with shell length of 2～3 cm was 500 000～600 000 clams/hm\+2 The ecological role of the constricted tagelus in the polyculture system was discussed

【Fund】： 国家攀登计划 国家自然科学基金 国家九五攻关计划专题 国家九五海水池塘无污染综合养殖联合资助

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