中国对虾与海湾扇贝投饵混养的实验研究

用放在海水池塘中的8个陆基围隔(5.0m×5.0m×1.8m),研究中国对虾(Penaeuschinensis)与不同密度海湾扇贝(Argopectenirradians)投饵混养的放养方式、生产力和极限放养量.对虾体长(2.85±0.16)cm,扇贝壳长(1.10±0.12)cm,放养密度分别为6.0尾/m2和0,1.5,4.5,7.5粒/m2,用投饵和施肥(鸡粪和化肥)饲养.结果表明,扇贝密度为0和1.5粒/m2时,对虾的成活率无显著差异.混养(扇贝1.5粒/m2)时对虾的出塘体长、体重和产量分别比单养高2.5%,3.8%和6.5%;当扇贝密度高于1.5粒/m2时,对虾的平均体长、体重和产量随扇贝密度的增加而显著减少(P＜0.05).扇贝密度为1.5和7.5粒/m2时,其产量由470kg/hm2增至1236kg/hm2;当扇贝密度高时,去壳后湿重占体重的百分数从(42.84±3.44)%降至(37.88±4.26)%.扇贝的极限放养量为600～800kg/hm2,适宜放养密度为1.0～1.5粒/m2.

Experimental studies on intensive polyculture of Chinese shrimp with bay scallop

Stocking performance, productivity and up limit carryi ng amount in an intensive polyculture of Cinense shrimp(Penaeus chinensi s)with bay scallop(Argopecten irradians)were investigate d by using 8 enclosures, each 5.0 m×5.0 m×1.8 m, fitted in a closed 1.7 hm2 seawater pond in 1996. The Chinese shrimp and juvenile bay scallop were bred mix ed in the enclosures at a density of 6.0 shrimp/m2 and 0, 1.5,4.5 and 7.5 scal lop/m2,respectively, and reared with commercial feed,chicken manure and chemic al fertilizer.There was no significant difference in survival rate of Chinese sh rimp between 0 and 1.5 scallop/m2; the mean final body length, body weight and yield of shrimp decreased with the increasing of stocking density of bay scallo p significantly(P<0.05).The yield of the bay scallop incresaed from 470 kg/hm2 at 1.5 scallop/m2 to 1 236 kg/hm2 at 7.5 scallop/m2. However, the percent age of wet soft tissue weight in total wet weight decreased from (42.84±3.44)% at low scallop density to (37.88±4.26) % at high scallop density. The results i ndicate that the up limit carrying amount of scallop is 600～800 kg/hm2 and th e optimum stocking density of scallop is 1.0 scallop/m2.