东海北部桁杆拖虾渔获组成分析

Analysis of the Catch Composition of Shrimp Beam Trawl in the Northern East China Sea

根据2017年全年桁杆拖虾动态监测资料,对东海北部桁杆拖虾的生产情况和渔获组成情况进行了研究。结果表明,调查船全年捕捞总产量111.87 t,较上世纪90年代(140~150 t),产量下降明显。全年平均CPUE为40.22 kg^-h·^-1,其中上半年平均CPUE为31.79 kg^-h·^-1,下半年平均CPUE为42.71 kg^-h·^-1.全年桁杆拖虾渔获物中,共鉴定种类135种,其中目标渔获物虾类23种,副渔获物112种。渔获尾数组成中,虾类为优势类群,占总渔获尾数的62.04%;渔获重量组成中,鱼类为优势类群,占总渔获重量的36.99%,其次为虾类占33.20%。虾类优势种为哈氏仿对虾、中华管鞭虾和葛氏长臂虾;副渔获物中优势种为口虾螞、双斑噂、绿鳍鱼、细点圆趾蟹和细条天竺鯛。

Based on the monitoring data of 2017,we studied the production and catch composition of shrimp beam trawl in the northern East China Sea.The results showed that the total catch was 111.87 tons in 2017,which is significantly lower than those in 1990s(140-150 tons).The average CPUE was 40.22 kg^-h·^-1,of which the average CPUE in the first half year was 31.79 kg^-h·^-1 and the average CPUE in the second half was 42.71kg^-h·^-1.A total of 135 species were recorded,of which there were 23 shrimp species and 112 by-catch species.Shrimp was the dominant group,which accounted for 62.04%of the total catch by number.Fish was the dominant group accounting for 36.99% of the total catch by mass, and shrimp accounted for 33.20%. Thedominant shrimp species were Parapenaeopsis hardwickii, Solenocera crassicornis and Palaemon gravieri^ andtheir IRI were 5 962.68, 2 347.36 and 1 274.00, respectively. The dominant by -catch species wereOrotosquilla oratoria^ Charybdis bimaculata^ Charybdis bimaculata, Che Udonichthys kumu^ Ovalipes punctatusand Apogon Uneatus, and their IRI were 2 590.23, 1 716.99, 1 368.43, 1 103.95 and 1 102.72, respectively.