Fish abundance in the San Francisco Estuary (1959-2021), an integration of 9 monitoring surveys.

The San Francisco Estuary (SFE) is simultaneously a central hub of
water delivery in California and home to commercially important and
endangered fishes, such as Chinook Salmon, Green Sturgeon, and Delta
and Longfin Smelt. Extensive ecological monitoring has been
conducted for over 50 years, mainly under the auspices of the
Interagency Ecological Program for the San Francisco Estuary
(https://iep.ca.gov/). We integrated fish catch and length data from
9 long-term monitoring surveys in the SFE. The integrated database
contains survey-level data such as environmental variables and
sampling effort in addition to the fish-level species, lengths, and
counts. Zero catches have been filled in for any species not caught
in a sample. The geographic scope includes San Francisco Bay through
the upper estuary, and the timeseries spans 1959 to 2021. Sampling
methods, gear, fish length metric, and other factors differ among
the component surveys. Sampling designs (locations and temporal
frequency) have also changed over time. Thus, it is highly
recommended to inspect the documentation of the component surveys
for more information on their methods.

旧金山河口（San Francisco Estuary, SFE）既是加州输水系统的核心枢纽，也是多种兼具商业价值与濒危等级的鱼类的栖息地，包括奇努克鲑鱼（Chinook Salmon）、绿鲟（Green Sturgeon）、三角洲胡瓜鱼（Delta Smelt）与长鳍胡瓜鱼（Longfin Smelt）。该区域已开展逾50年的大规模生态监测工作，主要由旧金山河口跨部门生态项目（Interagency Ecological Program for the San Francisco Estuary，官网地址：https://iep.ca.gov/）牵头实施。本数据集整合了SFE范围内9项长期监测调查的渔获量与体长数据，该整合数据库除包含鱼类个体层面的物种信息、体长数据与个体计数外，还涵盖了调查层面的环境变量与采样强度（sampling effort）。数据库已为样本中未捕获的物种补填了零捕获记录。该数据集的地理覆盖范围涵盖旧金山湾至河口上游区域，时间序列的跨度为1959年至2021年。各组分调查的采样方法、采样器具、鱼类体长度量标准及其他相关参数均存在差异，采样设计（包括采样点位与时间频率）也随时间推移发生了变化。因此，强烈建议研究者查阅各组分调查的文档，以获取其方法学的详细信息。