渤海湾与莱州湾西部毛虾定置网渔获物组成的初步分析

PRELIMINARY ANALYSIS ON THE COMPOSITION OF CATCHES FROM SET NET USED FOR NETTING ACETES CHINENSIS IN BOHAI BAY AND WESTERN LAIZHOU BAY

渤海湾与莱州湾西部,定置网的主要渔获物种类,挂子网50余种,樯张网40余种。主要捕捞对象是毛虾,其他种类大多都在2％以下。其中占0.1％以上的经济幼鱼、幼虾有鳓、青鳞、斑鰶、黄鲫、鲻、梭鱼、鲈、梅童鱼、小黄鱼、黄姑鱼、银鲳、半滑舌鳎和幼对虾等。毛虾等经济虾类和经济鱼类的主要出现时间,挂子网为7月11日—8月20日;樯张网为7月6日—8月25日。夏一世代毛虾产卵群体的主要死亡时间在8月中、下旬。经济幼鱼和幼对虾,挂子网从6月21日,樯张网从5月21日开始逐日增多,至8月20日以后出现的数量都很少。为合理利用毛虾资源,保护经济幼鱼、幼虾资源,根据调查结果并参看毛虾生殖期等有关文献资料,建议这两个海区的毛虾生产期,春汛挂子网应于6月20日,樯张网于5月20日结束,秋汛应于8月21日开捕为宜。禁渔期,挂子网应由原来的7月1日—8月31日调整为6月21日—8月20日;樯张网由原来的6月10日—8月31日调整为5月21日—8月20日较为合理。

In this article, we report our observations and analysis for the structure of catches with set net in Bohai Bay and Laizhou Bay. There are more than 50 species with grape net and over 40 species with barrier net. They are mainly shrimps; the others are below 2%, of which the young of the main economic fishes and shrimp are over 0.1%, including Llisha elongta, Harengla zunasi, Clupanodon punclatus, Setipinna taty, Hugil cephalus, Mugil so-iug, Lateolabrax japonicus, Collichthys lucidas, Pseudosciacna polyactis, Nibea albiflora, Stromaleoides argenteus, Cynoglossus semilaevis, Penaeus orientalis, etc.The main appearing period of shrimp and the other ecomonic fishes is from 11th, July to 20th, August for grape net and from 6th, July to 25th, August for barrier net. The main dead period for over summer generation's shrimp is from 11th to 31st, August. The economic fish juveniles and shrimp juveniles increase daily from 21st June for grape net and from May 21st for barrier net. After August 20th both seldom appear.In order to make rational use of shrimp resources and to protect the resources of the young of economic fish and shrimp, according to the results of our investigation and the reference materials for the productive period, it is advisable to end the productive period in the two bays on June. 20th for grape net and May 20th for barrier net in spring floods, and to begin catching on August 21st in autumn floods. The period of no fishing should be changed form July 1st to August 30th into June 21st to August 20th for grape net and form June 10th to August 31st into May 21st to August 20th for barrier net.