摘要
本文讨论了渤海对虾(Penaeus orientalis Kishinouye)的自然死亡,估算了它的世代数量和捕捞死亡系数等。1.用滑动平均数资料,估算了秋汛渤海对虾的旬自然死亡系数,约为0.038,其真值在0≤M<0.194。2.用世代分析方法估算了秋汛渤海对虾10个世代在9月初的资源量。经过三个月的捕捞,到12月初,约捕出雌虾77%,自然死亡13%,游出渤海约10%;捕出雄虾约59%,自然死亡约37%,游出渤海不到5%。3.估算了分旬的捕捞死亡系数,雌雄虾相近,约为0.23。近岸虾流网等网具造成的捕捞死亡系数,1977—1979三年平均值约为0.15,约占总捕捞死亡系数的8%。因它的作业期早,近岸网具渔获量占总渔获量的18.6%左右。1981年已达30%。
In this paper the natural mortality of the Chinese prawn in Bohai Sea was discussed,and the stock abundance,the fishing mortality was estimated.With the data of the moving average during 1965-1976,the natural mortality was estimated to be about 0.038 per ten-day period for females.Because of the mating mortality,the natural mortality of the male is higher than that of females.The true value of the natural mortality is within the range of 0≤M<0.194.The cohort analysis was applied to estimate the abundance of the Chinese prawn in Bohai Sea and the result was presented in table 5.After fishing from September to November,the survivors migrated into the Yellow Sea are about 10 percent for females and less than 5 percent for males on ten years average.On the basis of estimated abundance early in September the fishing mortality per ten-day period was calculated to be about 0.23 for females and 0.22 for males on ten years average.The problem to assign the fishing mortality to inshore and offshore segment of the fishery was discussed.With the data of the catches in inshore segment and abundance at the beginning of fishing season,the fishing mortality caused by this segment was estimated to be about 0.15 on three years(1977-1979)average,accounting for 8 percent of the total fishing mortality.Because the inshore segment operated at fishing season earlier than offshore segment the catches are 18.6 percent of total yield.Recently the catches of the inshore segment have greatly increased,attaining to 30 percent in 1981.
作者
叶昌臣
邓景耀
韩光祖
Ye Changchen;Deng Jingyao;Han Guangzu(Marine Fisheries Research Institute of Liaoning Province,Dalian;Yellow Sea Fisheries Researsh Institute,Qingdao;Marine Fisheries Rescarch Institute of Shandong Province,Yantai)
出处
《海洋与湖沼》
1987年第6期540-548,共9页
Oceanologia Et Limnologia Sinica
