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  • Title

    Monitoring and Evaluation of the North Delta Food Subsidies and Colusa Basin Drain Study

    Lead California Department of Water Resource [DWR]
    Description The North Delta Food Subsidies – Colusa Basin Drain Study monitors and evaluates the effects of the North Delta Flow Action on the Delta food web.
    Science topics Delta Smelt, Fish, Flows, Water management
    Updated April 29, 2022
  • Title

    The effects of early hypersaline acclimation due to climate change on the toxicity of pyrethroid, an insecticide, in salmonids.

    Lead University of California - Riverside [UC Riverside]
    Description Sea level rise and drought are expected to result in hypersaline waterways in the Delta. Endangered Chinook salmon and Steelhead trout go through smoltification to be able to live and mature in saline environments. However, with salinities and temperatures increasing in historically freshwater areas, these fish may be facing new stressors. Pesticide runoff into the Delta is common due to the urbanization and agriculture of many regions and can adversely affect fish. Additionally, previous research has shown that salinity exposure increases the toxicity of contaminants in anadromous fish, and it is had been demonstrated that bifenthrin, a common insecticide in the Bay, can have endocrine disrupting effects on juvenile salmonids. This project will examine the impacts of hypersaline conditions, various temperatures, and exposure to bifenthrin on the development and survival of juvenile Chinook salmon and Steelhead trout. Specifically, it will: Test the impacts of premature hypersaline acclimation and temperature on the survivial and smoltification process of a range of juvenile salmonids; Test the combined impacts of premature hypersaline acclimation, temperature, and bifenthrin exposure on smoltification, survival and behavior;and Predict the population level effects of drought and pesticide runoff on the health of endangered salmonids Additionally, this research will provide information to CA Department of Pesticide Regulation for potential pesticide management in the Delta, as well as to the CA Department of Fish and Wildlife for conservation practices of endangered juvenile salmonids in the Delta.
    Science topics Salinity
    Updated April 29, 2022
  • Title

    Suisun Marsh Salinity Control Gate Study

    Lead California Department of Water Resource [DWR]
    Description Description Suisun Bay and Marsh are a key part of the habitat for Delta Smelt, but during drier periods such as summer, Delta Smelt may be at least partially excluded from Suisun Marsh due to high salinities. The purpose of this proposal is to provide scientific support a management action for Smelt, operation of the Suisun Marsh Salinity Control Gates (SMSCG). This facility is currently to tidally pump water into the Marsh to improve fall and winter habitat conditions for waterfowl, but could also provide a tool to manage aquatic habitat for Delta Smelt in other periods. Specifically, by using the SMSCG to direct more fresh water in Suisun Marsh, our prediction is that reduced salinities will improve habitat conditions for Delta Smelt in the region. Need The status of Delta Smelt is dire. As part of the Resources Agency's Delta Smelt Resiliency Strategy, in August 2018 we conducted pilot operations of the SMSCG to support Delta Smelt , with promising results. Based on this early success, we expect that the SMSCG will be used as a seasonal tool to support Delta Smelt in summer-fall in coming years as part of the coming FWS Biological Opinion and DFW ITP. Neither has been completed, but SMSCG operations for fish are expected to be required in each. Hence, the proposed study is intended to provide a scientific evaluation and guidance for an expected SMSCG action in 2020. Objectives The primary objective of this project is to evaluate the effectiveness of the SMSCG action. Questions to be addressed include: • Did the action improve habitat conditions for Delta Smelt in the Suisun Region? • Does the Suisun Region typically have better habitat and food web conditions than the upstream River Region? • Do Delta Smelt respond favorably to the SMSCG flow action? • Does operation of the SMSCG affect other fishes and clams?
    Science topics Salinity
    Updated April 29, 2022
  • Title

    Extracting Better Information from Long-Term Monitoring Data: Estimating Occupancy and Abundance of Near-Shore Fishes in the Sacramento-San Joaquin River Delta

    Lead U.S. Fish and Wildlife Service [USFWS]
    Description Description The purpose of this study is to expand IEP monitoring and inference to other dominant near-shore, littoral habitats not sampled by beach seines through the use of boat electrofishing. To accomplish this we will sample key littoral fish species across various near-shore habitats in order to determine how best to estimate abundance, occupancy, capture probabilities, and related environmental drivers. Need Expanding DJFMP sampling to other habitats throughout the Delta will allow our program to detect and monitor fishes and ecological trends through time, alleviating a recognized data gap. Current sampling relies on data collected through non-random fixed point sampling of unobstructed habitats, which limits the utility of our data to inform management decision. Objectives • Design boat electrofishing survey methods to expand DJFMP’s monitoring into habitats and locations not sampled by beach seining. • Design and develop field and data analysis methods for estimating capture probability and abundance using boat electrofishing techniques. • Predict spatio-temporal distribution of habitats occupied by key littoral species.
    Science topics Habitat
    Updated April 29, 2022
  • Title

    Marine Invasive Species Program [MISP]

    Lead California Department of Fish and Wildlife [CDFW]
    Description The Marine Invasive Species Program (MISP) is responsible for analysis of shipping vectors (pathways) responsible for the introduction of non-indigenous species (NIS) into California's coastal waters. MISP has partnered with the Smithsonian Environmental Research Center (SERC) and Moss Landing Marine Laboratories (MLML) to undertake an extensive program to analyze spatial and temporal patterns of NIS invasions in marine and estuarine waters of California. MISP collaborates with the California State Lands Commission (CSLC) to regulate and minimize the introduction of Nonindigenous Species (NIS) into California by ocean-going vessels. MISP is partners with the Smithsonian Environmental Research Center (SERC) to conduct biological surveys monitoring the coastal waters of California to determine the level of invasion by NIS;and San Jose State University's Moss Landing Marine Labs (MLML) to conduct genetic analysis of NIS. The California Ballast Water Management Act of 1999 initiated baseline surveys by the California Department of Fish and Wildlife (CDFW) to document the distribution of nonindigenous species in the state's coastal and estuarine waters.
    Science topics Striped bass, Corbicula/Potamocorbula, Water hyacinth, Brazilian waterweed, Spongeplant, Giant reed, Yellow star thistle, Invasive / non native species
    Updated April 29, 2022
  • Title

    Delta Juvenile Fish Monitoring Program [DJFMP]

    Lead U.S. Fish and Wildlife Service [USFWS]
    Description The abundance of juvenile Chinook Salmon (all races) emigrating from the Central Valley's tributaries on their way to the ocean is estimated by the U.S. Fish and Wildlife Service Delta Juvenile Fish Monitoring Program that operates in and around the Delta. The Delta Juvenile Fish Monitoring Program (DJFMP) conducts annual monitoring of juvenile fishes, participates in multi-agency research activities, and contributes to several technical and management committees within the region.
    Science topics Water temperature, Dissolved oxygen, Turbidity, Main channels, Sloughs, Chinook Salmon, Crustaceans, Fish, Invertebrates
    Updated April 29, 2022
  • Title

    Yolo Bypass Fish Monitoring

    Lead California Department of Water Resource [DWR]
    Description California Department of Water Resources (DWR) has operated a fisheries monitoring program in the Yolo Bypass, a seasonal floodplain and tidal slough, since 1998. The objectives of the Yolo Bypass Fish Monitoring Program (YBFMP) are to: (1) collect baseline data on lower trophic levels (phytoplankton, zooplankton, and aquatic insects), juvenile fish and adult fish, hydrology, and water quality parameters;(2) investigation of the temporal and seasonal patterns in chlorophyll-a concentrations, including whether high concentrations are exported from the Bypass during agricultural and natural flow events and the possibility of manipulating bypass flows to benefit listed species like Delta Smelt (Hypomesus transpacificus) and Chinook salmon (Oncorhynchus tshawytscha). The YBFMP operates a rotary screw trap and fyke trap, and conducts biweekly beach seine and lower trophic surveys in addition to maintaining water quality instrumentation in the bypass. The YBFMP serves to fill information gaps regarding environmental conditions in the bypass that trigger migrations and enhanced survival and growth of native fishes, as well as provide data for IEP synthesis efforts.
    Science topics Surface water / flow, Stage, Velocity, Direction, Tides, Flood, Chlorophyll A / B, Phytoplankton, Other zooplankton, Water temperature, Dissolved oxygen, pH, Turbidity, Other discharge contaminants, Mudflats, Intertidal / transition zones, Main channels, Chinook Salmon, Steelhead Trout, Green sturgeon, White Sturgeon, Delta Smelt, Longfin Smelt, Sacramento Splittail, Insects, Striped bass, Conductivity, Saltwater / freshwater marshes, Fish, Invasive / non native species
    Updated April 29, 2022
  • Title

    Food Temperature Optimization Model for CVP

    Lead U.S. Bureau of Reclamation [USBR]
    Description This study aims to improve understanding of how nutrient and zooplankton exports from CVP reservoirs impact downstream food web productivity.
    Science topics None specified
    Updated April 29, 2022