Images

Capturing juvenile Chinook salmon in Cougar Reservoir, Oregon using a Lampara net.

USGS divers Steve Rubin and Reg Reisenbichler laying out a survey transect. Completing his 12th dive at the site in 2023, Rubin has been conducting dive surveys around the mouth of the Elwha River for over a decade as part of an evaluation of ecosystem health and recovery since the Elwha dams were breached in 2011.

Juvenile Pacific herring with skin ulcers from Ichthyophonus disease.

The green water, caused by massive blooms of Aphanizomenon flos-aquae, as seen in the wake of a boat, is a common sight each summer on Upper Klamath Lake, Oregon. USGS studies how these blooms effect endangered Lost River and shortnose suckers in the lake.

Juvenile Snake River fall Chinook salmon.

Looking down on the Marrowstone Marine Field Station.

Red Irish lord sculpin - Scuba divers from the U.S. Geological Survey’s Western Fisheries Research Center, Washington Sea Grant, EPA and the Lower Elwha Klallam Tribe collected data and images from a long-term study of the Elwha River dam removals and the resulting effects on the nearshore ecosystem.

USGS divers Steve Rubin and Reg Reisenbichler laying out a survey transect in the Elwha River in northern Washington.

Desert pupfish, adult male, in seine net with other fish. Captured from the USGS/BOR Shallow Habitat Project experimental ponds on the southeast side of the Salton Sea, CA.

Desert pupfish, adult female, in seine net with other fish. Captured from the USGS/BOR Shallow Habitat Project experimental ponds on the southeast side of the Salton Sea, CA.

Sunrise on Pompey Peak, Washington.

Specific Pathogen-Free (SPF) Pacific herring reared in the wet laboratory at the Marrowstone Marine Field Station.

Gary Barton (USGS) collects particle size analysis samples of the surface riverbed material of the Kootenai River about three miles upstream from Bonners Ferry, ID.

Underwater image of Pacific herring bait ball in Puget Sound. Herring aggregate in schools for protection.

Typical clinical signs of SVC disease, exopthalmia and abdominal distension with hemorrhaging seen in a virus-exposed fathead minnow.

Figure 1. Appearance of descaling site exposed to fast green FCF dye six hours after intentional descaling injury, showing loss of scales and presence of fast green staining. Areas of unintentional integumental injury are also stained (arrows).

Related image Figure 2.

Figure 2. Scanning electron micrograph of descaling area delimited by box in Figure 1 showing epidermal disruption, empty scale pockets and an exposed scale with visible concentric ridges (upper right). Scale bar = 500 µm.

Figure 3. Appearance of descaling site exposed to fast green FCF dye 96 hours after intentional descaling injury, showing lack of scales, presence of fast green staining in areas of epidermal disruption and absence of staining in areas where migrating epidermal cells have closed the wound.

Figure 4.  Scanning electron micrograph of descaling area delimited by box in Figure 3 showing epidermal disruption (arrows), empty scale pockets and restoration of epidermal integrity (asterisk). An exposed scale with visible concentric ridges is visible at the lower center. Scale bar = 500 µm.

Researcher weighing sturgeon.  Columbia River, bottom trawl for young-of-year (YOY) indexing.

Researcher measuring sturgeon length. Bottom trawl for young-of-year (YOY) indexing. Columbia River.