Interagency Ecological Program San Francisco Estuary 20mm Survey 1995 - 2021

• Main Authors: Interagency Ecological Program (IEP), Lauren Damon, Adam Chorazyczewski
• Format: Dataset
• Language: unknown
• Published: Environmental Data Initiative 2021
• Subjects: Interagency Ecological Program for the San Francisco Bay Delta Estuary; Delta Smelt; CDFW Stockton Labs; estuaries; long term monitoring; endangered species; fishes; population dynamics; larvae; turbidity; water temperature; tides; Alosa Alosa sapidissima; Clevelandia Clevelandia ios; Lepidogobius Lepidogobius lepidus; Syngnathus Syngnathus leptorhynchus; Percina Percina macrolepida; Pomoxis Pomoxis nigromaculatus; Lepomis Lepomis macrochirus; Sebastes Sebastes auriculatus; Symphurus Symphurus atricaudus; Cyprinus Cyprinus carpio; Tridentiger Tridentiger trigonocephalus; Ictalurus Ictalurus punctatus; Ilypnus Ilypnus gilberti; Oncorhynchus Oncorhynchus tshawytscha; Hypomesus Hypomesus transpacificus; Parophrys Parophrys vetulus; Notemigonus Notemigonus crysoleucas; Carassius Carassius auratus; Lavinia Lavinia exilicauda; Menidia Menidia beryllina; Atherinopsis Atherinopsis californiensis; Micropterus Micropterus salmoides; Spirinchus Spirinchus thaleichthys; Gillichthys Gillichthys mirabilis; Gambusia Gambusia affinis; Engraulis Engraulis mordax; Clupea Clupea pallasii; Leptocottus Leptocottus armatus; Porichthys Porichthys notatus; Cottus Cottus asper; Lucania Lucania parva; Lepomis Lepomis microlophus; Orthodon Orthodon microlepidotus; Ptychocheilus Ptychocheilus grandis; Catostomus Catostomus occidentalis; Tridentiger Tridentiger bifasciatus; Cymatogaster Cymatogaster aggregata; Tridentiger Tridentiger barbatus; Citharichthys Citharichthys stigmaeus; Pogonichthys Pogonichthys macrolepidotus; Micropterus Micropterus punctulatus; Platichthys Platichthys stellatus; Morone Morone saxatilis; Dorosoma Dorosoma petenense; Gasterosteus Gasterosteus aculeatus; Atherinops Atherinops affinis; Hypomesus Hypomesus nipponensis; Ameiurus Ameiurus catus; Pomoxis Pomoxis annularis; Genyonemus Genyonemus lineatus; Acipenser Acipenser transmontanus; Acanthogobius Acanthogobius flavimanus; Alosa sapidissima; Clevelandia ios; Lepidogobius lepidus; Syngnathus leptorhynchus; Percina macrolepida; Ictalurus melas; Pomoxis nigromaculatus; Lepomis macrochirus; Ictalurus nebulosus; Sebastes auriculatus; Symphurus atricaudus; Cyprinus carpio; Tridentiger trigonocephalus; Ictalurus punctatus; Ilypnus gilberti; Oncorhynchus tshawytscha; Hypomesus transpacificus; Parophrys vetulus; Notemigonus crysoleucas; Carassius auratus; Lavinia exilicauda; Menidia beryllina; Atherinopsis californiensis; Micropterus salmoides; Spirinchus thaleichthys; Gillichthys mirabilis; Gambusia affinis; Engraulis mordax; Clupea pallasii; Lampetra tridentata; Leptocottus armatus; Porichthys notatus; Cottus asper; Lucania parva; Lepomis microlophus; Lampetra ayresi; Orthodon microlepidotus; Ptychocheilus grandis; Catostomus occidentalis; Tridentiger bifasciatus; Cymatogaster aggregata; Tridentiger barbatus; Micropterus dolomieui; Citharichthys stigmaeus; Pogonichthys macrolepidotus; Micropterus punctulatus; Platichthys stellatus; Morone saxatilis; Dorosoma petenense; Gasterosteus aculeatus; Atherinops affinis; Hysterocarpus traski; Hypomesus nipponensis; Ameiurus catus; Pomoxis annularis; Genyonemus lineatus; Acipenser transmontanus; Acanthogobius flavimanus; Pablo; Catostomus catostomus
• Online Access: https://pasta.lternet.edu/package/metadata/eml/edi/535/3

The Interagency Ecological Program San Francisco Estuary 20-mm Survey was initiated by the California Department of Fish and Wildlife (CDFW) in 1995 to monitor the distribution and abundance of post-larval and juvenile Delta Smelt (Hypomesus transpacificus). Delta Smelt are considered to be an annual fish endemic to the upper San Francisco Estuary that spawn in early spring and rear through the summer and fall in fresh to brackish water. Young of the Year (YOY) Delta Smelt are considered juveniles at sizes greater than or equal to 20-mm, and this survey targets those Delta Smelt. The 20-mm Survey currently samples 47 stations at fixed locations from San Pablo Bay through Suisun Bay and into the Sacramento-San Joaquin River Delta every other week from March to July. During high outflow years, 5 additional stations are sampled in San Pablo Bay to provide greater spatial coverage of potential Delta Smelt habitat. The survey has historically sampled between 41 and 55 stations. At each station, three 10-minute stepped oblique tows are conducted for fish. Each stepped oblique tow follows a tow schedule to sample the entire water column, and the volume of water sampled is estimated using a General Oceanics flowmeter. The net is a cone shaped plankton net composed of 1600μm mesh and measuring 5.5 meters in length with a mouth area of 1.51m2 lashed onto a rigid D-frame with skis. Post-larval and juvenile fish samples are preserved in the field in 10% Formalin dyed with Rose Bengal and brought back to the CDFW Stockton Lab for identification to species and enumeration under a microscope. At each station, environmental and water quality data are also collected, and include: top temperature, top and bottom electrical conductivity (normalized at 25degreeC), water clarity, and tidal condition.