Fish survey, fishing duration, and other data from net trawls in the Gulf of Alaska from the NORTH PACIFIC as part of Outer Continental Shelf Environmental Assessment Program (OCSEAP) from 03 May 1975 to 07 August 1975 (NODC Accession 7601886)

Fish survey, fishing duration, and other data were collected from net trawls in the Gulf of Alaska from the NORTH PACIFIC from 03 May 1975 to 07 August 1975. Data were collected by the National Marine Fisheries Service (NMFS), Seattle, as part of Outer Continental Shelf Environmental Assessment Program (OCSEAP). Data were processed by NODC to the NODC standard F123 Fish/Shellfish Surveys format. Full format description is available from NODC at www.nodc.noaa.gov/General/NODC-Archive/f123.html. An analog file for this accession is available from NODC user services.

The F123 format is used for data from field sampling of marine fish and shellfish. The data derive from analysis of midwater or bottom tow catches and provide information on population density and distribution. Cruise information, position, date, time, gear type, fishing distance and duration, and number of hauls are reported for each survey. Environmental data may include meteorological conditions, surface and bottom temperature and salinity, and current direction and speed. Bottom trawl or other gear dimensions and characteristics are also reported. Catch statistics (e.g., weight, volume, number of fish per unit volume) may be reported for both total haul and for individual species. Biological characteristics of selected specimens, predator/ prey information (from stomach contents analysis), and growth data may also be included. A text record is available for comment.

本数据集采集了1975年5月3日至1975年8月7日期间，于阿拉斯加湾（隶属于北太平洋海域）通过拖网捕捞获取的鱼类调查、捕捞时长及相关数据。该数据由美国国家海洋渔业局（National Marine Fisheries Service, NMFS）西雅图分部采集，作为外大陆架环境评估计划（Outer Continental Shelf Environmental Assessment Program, OCSEAP）的一部分。国家海洋数据中心（National Oceanographic Data Center, NODC）已将数据处理为符合NODC标准的F123鱼类/贝类调查（F123 Fish/Shellfish Surveys）格式。完整格式说明可通过NODC官网www.nodc.noaa.gov/General/NODC-Archive/f123.html查阅。本入库数据的模拟文件可通过NODC用户服务渠道获取。

F123格式用于海洋鱼类与贝类的野外采样数据。其数据源自中层拖网或底拖网渔获物的分析，可提供种群密度与分布相关信息。每份调查均记录了科考航次信息、作业位置、日期、时间、作业装备类型、捕捞距离与时长以及拖网次数。环境数据可涵盖气象条件、表层与底层水温及盐度、海流方向与流速。同时记录了底拖网或其他作业装备的尺寸与参数。渔获统计信息（如单位体积内的鱼类重量、体积、数量）可分别针对总渔获量与单个物种进行统计。此外，还可包含选定标本的生物学特征、捕食者/猎物信息（源自胃容物分析）以及生长相关数据。另有文本记录可供备注。