Interagency Ecological Program: Over four decades of juvenile fish monitoring data from the San Francisco Estuary, collected by the Delta Juvenile Fish Monitoring Program, 1976-2021

The United States Fish and Wildlife Service Delta Juvenile Fish Monitoring Program (DJFMP) has monitored juvenile Chinook Salmon Oncorhynchus tshawytscha and other fish species within the San Francisco Estuary (Estuary) since 1976 using a combination of surface trawls and beach seines. Since 2000, three trawl sites and 58 beach seine sites have been sampled weekly or biweekly within the Estuary and lower Sacramento and San Joaquin Rivers. As part of the Interagency Ecological Program (IEP) that manages the Estuary, the DJFMP has tracked the relative abundance and distribution of naturally and hatchery produced juvenile Chinook Salmon of all races as they outmigrate through the Sacramento-San Joaquin Delta for over four decades. The data that DJFMP collected has been used not only to help inform the management of Chinook Salmon, but also to monitor the status of native species of interest such as the previously listed Sacramento Splittail Pogonichthys macrolepidotus and invasive species such as Mississippi Silverside Menidia beryllina and Largemouth Bass Micropterus salmoides. For more information: https://www.fws.gov/lodi/juvenile_fish_monitoring_program/

美国鱼类和野生动物管理局三角洲幼鱼监测计划（Delta Juvenile Fish Monitoring Program, DJFMP）自1976年起，采用表层拖网与海滩围网相结合的采样方式，对旧金山河口（以下简称"河口"）内的奇努克幼鲑（Oncorhynchus tshawytscha）及其他鱼类物种开展长期监测。2000年以来，该计划在河口以及萨克拉门托河与圣华金河下游区域布设3个拖网采样点位与58个海滩围网采样点位，每周或每两周开展一次采样。作为负责该河口管理的跨部门生态计划（Interagency Ecological Program, IEP）的组成部分，四十余年来，DJFMP持续追踪各类自然繁育与孵化场繁育的奇努克幼鲑各种群经萨克拉门托-圣华金三角洲向外洄游过程中的相对丰度与空间分布特征。DJFMP采集的监测数据不仅可为奇努克鲑的资源管理提供决策依据，还被用于监测各类受关注本土物种的种群现状——例如此前被列入保护名录的萨克拉门托裂鳍鱼（Pogonichthys macrolepidotus），以及密西西比银汉鱼（Menidia beryllina）、大口黑鲈（Micropterus salmoides）等入侵物种。更多详细信息请访问：https://www.fws.gov/lodi/juvenile_fish_monitoring_program/