Jellyfish and forage fish catch data, Bering Sea, 2004-2012

This data set contains information on catch of forage fish and large medusae from surface trawl surveys conducted from mid-August to early October. The sampling grid covered the shelf off western Alaska, from 160 to 172° W longitude and 55 to 64° N latitude. Stations were approximately 30 nautical miles (55.6 km) apart. All tows were standardized for gear (50 m wide by 18 m deep) and duration of tow (30 min at 3.5 to 5 knots, covering 2.8 to 4.6 km). Fish and jellyfish were collected using a Cantrawl model 400/601 (Cantrawl Pacific) midwater rope trawl, at or near the surface, with typical spreads of 66.4 m horizontally and 14.6 m vertically. Variable names are: year, vessel, station number, latitude (decimal degrees), longitude (decimal degrees), month, Chrysaora melanaster (catch number), Pacific herring (catch number)age-0 pollock, (catch number), age-0 Pacific cod (catch number), capelin (catch number). File format is CSV.

本数据集包含8月中旬至10月初开展的表层拖网调查中饵料鱼（forage fish）与大型水母（large medusae）的渔获信息。采样网格覆盖阿拉斯加西部外海大陆架区域，经度范围为西经160°至172°，纬度范围为北纬55°至64°，采样站点间距约30海里（55.6千米）。所有拖网作业均已标准化：渔具规格为宽50米、深18米；拖网时长30分钟，拖速3.5至5节，覆盖距离2.8至4.6千米。鱼类与水母样本通过Cantrawl Pacific公司的Cantrawl 400/601型中层绳拖网在表层或近表层采集，其典型水平展开宽度为66.4米，垂直展开高度为14.6米。变量名称包括：年份（year）、调查船（vessel）、站点编号（station number）、纬度（decimal degrees，十进制）、经度（decimal degrees，十进制）、月份（month）、黑星海刺水母（Chrysaora melanaster，渔获数量）、太平洋鲱鱼（Pacific herring，渔获数量）、0龄狭鳕（age-0 pollock，渔获数量）、0龄太平洋鳕（age-0 Pacific cod，渔获数量）、毛鳞鱼（capelin，渔获数量）。文件格式为CSV。