Images

Toby Kock (right, in plaid shirt) listens to a question during the Fish Passage Tour while standing on the North Shore Collector in the forebay of Cowlitz Falls Dam. The group discussed various ways that migrating juvenile salmon approach and pass the dam.

Participants of the Fish Passage Tour view the North Shore Collector separator at Cowlitz Falls Dam, WA. Fish are collected here to allow staff to count, determine species, and sample fish as they migrate downstream.

View of the forebay of the North Fork Dam of the Clackamas River Dam Complex, OR. An orange buoy system is seen on the right side of the image showing an exclusion net to prevent fish from getting behind the collector.

Purse seine net filled with Pacific herring in Prince William Sound Alaska. The seine net is deployed off the research vessel R/V Solstice (owned and operated by Alaska Department of Fish and Game) during a joint collection effort with the USGS to sample fish for an annual disease survey in the sound. Collection of herring is rare during the daytime.

U.S. Geological Survey, and Alaska Department of Fish and Game researchers perform disease sampling on herring collected from a purse seine in Prince William Sound Alaska. Sampling includes length, weight, sex, age, blood for VHSV antibodies and VEN slides, gills/kidney/spleen for VHSV, and hearts for Ichthyophonus.

Large purse seine net being loaded onto the research vessel R/V Solstice (Cordova Alaska). This net is used to collect Pacific herring throughout Prince William Sound. The herring disease surveys are the beginning of the field season for Alaska Department of Fish & Game in Cordova AK.

Using an ultra-light plane, researchers are looking at the landscapes where herring spawn in Prince William Sound Alaska.

Using an ultra-light plane, researchers are looking at the landscapes where herring spawn in Prince William Sound Alaska.

Using an ultra-light plane, researchers are looking at the landscapes where herring spawn in Prince William Sound Alaska.

Dr. David Paez observes as Chinook salmon undergo a swim performance trial. Water velocity in the swim chamber is increased over a prescribed period to determine time of exhaustion for each individual fish. Virus-exposed and healthy control fish are swum together in a small group and must be watched carefully.

(Left to Right) Dr. David Paez, Joanna Salzer, Dr. Jee Youn Hwang and Bill Batts observe as Chinook salmon are conditioned in the swim flume prior to swim performance trials.

Chinook salmon orient into the water current of the swim flume during a performance trial.

(Left to Right) Bill Batts, Joanna Salzer, and Dr. Jee Youn Hwang sample fish during a swim performance trial. Once fish have completed swim trials they are euthanized and kept fresh on ice. Sampling includes length and weight measurements, and collection of a small portion of tissues to confirm the presence of virus.

USGS scientist setting up underwater video cameras in an eelgrass meadow on the Skagit River Delta. Eelgrass grows in shallow marine and estuarine waters where it forms structurally complex habitats that support many other aquatic species by providing attachment substrate, food, refuge from predation, and nursery areas.

USGS scientist setting up underwater video cameras in an eelgrass meadow on the Skagit River Delta. Eelgrass grows in shallow marine and estuarine waters where it forms structurally complex habitats that support many other aquatic species by providing attachment substrate, food, refuge from predation, and nursery areas.

Pacific Lamprey ammocoetes in a measurement tank. Tissues collected from the lamprey will be analyzed for mercury as part of a study on mercury contamination in the Columbia River Basin.

Multi-tribal ceremonial release of adult Chinook to the Spokane River during 2022 National American Fisheries Society meeting. Here, fish biologist, Jill Hardiman, participates in the event by releasing an adult Chinook salmon into the Spokane River.

Multi-tribal ceremonial release of adult Chinook to the Spokane River during 2022 National American Fisheries Society Meeting. Here, people line up to participate in ceremonial multi-tribal fish release in the Spokane River.

Multi-tribal ceremonial release of adult Chinook to the Spokane River during 2022 National American Fisheries Society Meeting. Here, fish biologist Ian Jezorek participates in ceremonial multi-tribal fish release in the Spokane River.

Overhead view of the Spokane River, where adult Chinook salmon were released during a multi-tribal ceremonial fish release. During 2022 National American Fisheries Society, many scientists and citizens took part in a ceremonial fish release. Adult Chinook salmon are currently blocked by dams and unable travel upstream to their historic range.

USGS scientist Dalton Lebeda is measuring a Fall Chinook salmon captured in the Snake River. This study is being conducted to determine the percentages of natural and hatchery origin spawners in the upper reach of Hells Canyon.