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,x_i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。
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.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1993年第2期137-142,共6页
Oceanologia Et Limnologia Sinica
关键词
中国对虾
增殖
回捕率
Enhancement stock Released shrimp and recapture catch
