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David Ayers

David Ayers - California Water Science Center

Science and Products

Scientific observations of fishes in tidal wetlands of the upper Sacramento San Joaquin Delta using imaging sonar devices, derived from 2018 field data

Major tidal wetland habitat restoration efforts are planned to benefit Delta Smelt and other imperiled species in the Sacramento-San-Joaquin Delta. However, successful implementation of habitat restoration is constrained by a paucity of information on the services and functions tidal wetlands provide for fishes. This knowledge gap is largely due to the difficulties of collecting ecological data in
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California Water Science Center

Dissolved oxygen controls summer habitat of Clear Lake Hitch (Lavinia exilicauda chi), an imperilled potamodromous cyprinid

The Clear Lake Hitch is an imperiled minnow endemic to Clear Lake, Lake County, California, USA that is listed as threatened under the California Endangered Species Act (ESA) and is a candidate for listing under the United States ESA. It exhibits a potamodromous life cycle whereby adults, which reach up to 6+ years in age and over 350 mm in length, migrate into Clear Lake’s ephemeral tributaries
By
Water Resources, California Water Science Center

Understanding the influence of predation on introduced fishes on juvenile salmonids in the Columbia River Basin: Closing some knowledge gaps. Late summer and fall diet and condition of smallmouth bass, walleye, and channel catfish in the middle Columbia R

American shad Alosa sapidissima in the middle Columbia River (MCR)—a high energy food available in the summer and fall—may be contributing to the increased growth and enhanced condition of nonnative piscivores. To test this hypothesis we quantified the late summer and autumn diets of smallmouth bass Micropterus dolomieu, walleye Sander vitreus, and channel catfish Ictalurus punctatus in the three
By
Ecosystems, Fisheries Program (unpublished), Western Fisheries Research Center, Columbia River Research Laboratory (CRRL)
Filter Total Items: 24
Image: Kelp Crab
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Photo of two small fish on a table.
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A woman pulls a small fish net over the side of a boat.
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Image: Graceful Crab in Puget Sound
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Image: Red Rock Crab in Puget Sound
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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People pulling fishing nets from the shoreline onto land.
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Image: Helmet Crab in Puget Sound
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Image: Juvenile Surf Smelt Surveys in Central Puget Sound, Washington
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Science and Products