Fish survey, fishing duration, and other data from net and otter trawls from the BIG VALLEY as part of Outer Continental Shelf Environmental Assessment Program (OCSEAP) from 20 May 1976 to 30 June 1976 (NODC Accession 7601547)

Fish survey, fishing duration, and other data were collected from net and otter trawls from the BIG VALLEY from 20 May 1976 to 30 June 1976. Data were collected by the Alaska Department of Fish and Game - Kodiak 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 comments.

1976年5月20日至1976年6月30日期间，研究人员依托“大谷”号（BIG VALLEY），通过网具与桁拖网（otter trawl）采集了鱼类调查、作业时长及其他相关数据。该数据集由阿拉斯加州鱼类与野生动物局科迪亚克分局作为外大陆架环境评估计划（Outer Continental Shelf Environmental Assessment Program，OCSEAP）的组成部分开展采集工作，后由国家海洋数据中心（National Oceanographic Data Center，NODC）按照NODC标准F123鱼类/贝类调查数据格式完成标准化处理。完整格式说明可通过NODC官网www.nodc.noaa.gov/General/NODC-Archive/f123.html查阅，本入藏数据集的模拟文件可通过NODC用户服务渠道获取。

F123格式适用于海洋鱼类与贝类野外采样数据的存储与管理。此类数据源自中层拖网或底拖网捕捞样品的分析结果，可提供种群密度与分布格局相关信息。每份调查记录均包含航次信息、作业位置、日期、时间、作业装备类型、拖曳距离与时长、拖网次数等核心内容。环境数据可涵盖气象条件、表层与底层水温及盐度、海流方向与流速等参数，同时记录底拖网或其他作业装备的尺寸与性能特征。捕捞统计数据（如单位体积渔获的重量、体积、鱼类数量等）可分别针对总捕捞量与单一物种进行统计。此外，数据集还可包含选定标本的生物学特征、基于胃容物分析得到的捕食者-猎物关系数据以及生长相关资料。数据集附带文本记录栏位，用于填写相关备注信息。