东海北部近海夏季虾类组成及其数量分布

Composition and distribution of shrimps in the coastal area of the Northern East China Sea in summer

依据2007年7月和2008年6月东海北部近海（123°～124°30’E、30°-32°N）桁杆拖虾定点调查资料，对夏季东海北部近海虾类资源的种类组成、数量分布特征进行了研究分析。夏季该水域共出现虾类18种，隶属于7科11属。其中6月份的优势种有鹰爪虾（IRI=7485）、葛氏长臂虾（IRI=2121）、脊腹褐虾（IRI=819．1）和戴氏赤虾（IRI=765．5），7月份的优势种有鹰爪虾（IRI=5637）、葛氏长臂虾（IRI=451．1）、须赤虾（IRI=3184）和戴氏赤虾（IRI=868．7）。夏季东海北部近海虾类资源群体重量密度分布主要呈现中部较少而东西两端分布较多的态势，不同优势种类的分布特征不同，鹰爪虾分布于整个调查海域，底温为12．1—21℃，底盐为31．1～34．6；脊腹褐虾主要分布于调查海域的东北部，底温为12．1～18℃，底盐为31～32．

Based on the suevey data of shrimp beam trawling in the coastal area of the Northern East China Sea （123° -124°30＇E, 30° -32°N）in July 2007 and June 2008, this paper analyzed species composition and the biomass distribution of shrimps. Altogether 18 shrimp species were found during the two surveys, belonging to 11 genus and 7 families. The dominant species in this area in June were Trachypenaeus curvirostris （IRI = 7 485 ）, Palaemon gravieri （ IRI = 2 121 ）, Crangon affinis （ IRI = 819. 1 ） and Metapenaeopsis dalei （IRI=765.5）, while in July were Trachypenaeus curvirostris （IRI = 5 637 ）, Palaemon gravieri （ IRI = 451.1 ）, Metapenaeopsis dalei （ IRI= 868.7 ） and Metapenaeopsis barbata （ IRI= 3 184 ）. The spatial distribution of the biomass density of the shrimp was low in abundance in central and high in east and west ends of the coastal area of the Northern East China Sea. The distribution characteristics of different dominant species were different, Trachypenaeus curvirostris distributed in the whole survey area, whose bottom temperature was 12.1 -21℃ and bottom salinity was 31.1 -34.6;Crangon affinis mainly distributed in the northeastern of the survey area, whose bottom temperature was 12.1 - 18℃, and bottom salinity was 31 -32.