| 摘要: |
| 以没有放流幼虾的1987年的河口区仔虾相对数量和8月份幼虾数量比值(109)为系数(a),以ni=axi式(ni是i年自然补充量, xi是i年河口区仔虾相对数量),估算胶州湾中国对虾有关年份自然补量。将各年8月份幼虾数量(Ni)扣除自然补充量后,再按捕捞系数(k)为0.75,以Ci=(Ni-ni)k/R式估算放流虾的回捕量和回捕率(C)。结果表明,1985, 1986和1988-1990年回捕率分别为16.05, 11.23, 8.49, 13.69和17.40％。对虾放流增殖效果显著。 |
| 关键词: 资源增殖 对虾放流与同捕 中国对虾 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院海洋研究所调查研究报告第2169号 |
附件 |
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| RECAPTURE RATE OF RELEASED SHRIMP PENAEUS CHINENSIS IN RESOURCE ENHANCEMENT EXPERIMENT IN JIAOZHOU BAY, YELLOW SEA |
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Liu Ruiyu, Cui Yuheng, Xu Fengshan
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Institute of Oceanology, Academia Sinica, Qingdao 266071
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| Abstract: |
| The present paper deals with the recruitment of the natural shrimp stock and the recapture of released shrimps in Jiaozhou Bay estimated based on the data of the density of wild brood stock in May, the relative number of post-larvae in June and the total number of young shrimps in August. Results are in Tab. 1 and Tab. 2.
Tab. 1 The estimated natural recruitment of young shrimp in Jiaozhou Bay (1985-1990)
Tab. 2 The estimated recapture rate and the catch of released shrimps in Jiaozhou Bay (1985-1990)
In comparison with the shrimp catch statistics of the Qingdao Municipal Fisheries Bureau, the estimated recapture production is reliable and the increase of shrimp catch is remarkable. By our estimation the recapture rate of released shrimps varied from 8.49% (1988) - 17.40% (1990). The factors determining the catch and recapture of released shrimps are different, but the most important one is no doubt the appropriate number for releasing. The appropriate number of commercial release for the Jiaozhou Bay area [ (70 - 100) ×106 ind ] as suggested by us has been accepted by local Fisheries Agency. |
| Key words: Enhancement stock, Released shrimp and recapture catch |
