Interagency Ecological Program (IEP), B. Mahardja, J. Speegle. 2018. Interagency Ecological Program: Over four decades of juvenile fish monitoring data from the San Francisco Estuary, collected by the Delta Juvenile Fish Monitoring Program, 1976-2017. Environmental Data Initiative. https://doi.org/10.6073/pasta/ea00fc37f0658dae21b817b1f93911cf.
Featured photo: United States Fish and Wildlife Service Delta Juvenile Fish Monitoring Program (DJFMP) staff conducting Kodiak trawl on the San Joaquin River near Lathrop, California, USA
The 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 tracks the 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 Splittail Pogonichthys macrolepidotus and invasive species such as Mississippi Silverside Menidia beryllina and Largemouth Bass Micropterus salmoides. The figure below shows the calculated biomass per volume for fishes captured by beach seine at the Sacramento-San Joaquin Delta over the years (Mahardja et al. 2017), demonstrating that biomass in the nearshore habitat have roughly doubled in the past twenty years.
For more information on the DJFMP, please refer to: https://www.fws.gov/lodi/juvenile_fish_monitoring_program/jfmp_index.htm. A data package resulting from another IEP funded project, the Yolo Bypass Fish Monitoring Program (YBFMP), was previously feature by EDI: “Interagency Ecological Program: Fish catch and water quality data from the Sacramento River floodplain and tidal slough, collected by the Yolo Bypass Fish Monitoring Program, 1998-2018.”
Mahardja B, Farruggia MJ, Schreier B, Sommer T (2017) Evidence of a Shift in the Littoral Fish Community of the Sacramento-San Joaquin Delta. PLoS ONE 12(1): e0170683. https://doi.org/10.1371/journal.pone.0170683.
Mahardja B, Conrad JL, Lusher L, Schreier B (2016) Abundance trends, distribution, and habitat associations of the invasive Mississippi Silverside (Menidia audens) in the Sacramento-San Joaquin Delta, California, USA. San Francisco Estuary and Watershed Science. 14(1): Article 1. https://doi.org/10.15447/sfews.2016v14iss1art2.
Brown LR, May JT (2006) Variation in Spring Nearshore Resident Fish Species Composition and Life Histories in the Lower Sacramento-San Joaquin Watershed and Delta. San Francisco Estuary and Watershed Science. 4(1): Article 1. https://escholarship.org/uc/item/09j597dn.
Feyrer F, Sommer TR, Baxter RD (2005) Spatial-temporal distribution and habitat associations of age-0 Splittail in the Lower San Francisco Estuary Watershed. Copeia, 1: 159-168. https://doi.org/10.1643/CE-04-187R1.
Recommended citation for this data package
Interagency Ecological Program (IEP), B. Mahardja, J. Speegle. 2018. Interagency Ecological Program: Over four decades of juvenile fish monitoring data from the San Francisco Estuary, collected by the Delta Juvenile Fish Monitoring Program, 1976-2017. Environmental Data Initiative. https://doi.org/10.6073/pasta/ea00fc37f0658dae21b817b1f93911cf. Dataset accessed 2/07/2019.