Images

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 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.

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.

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.

Typical clinical signs of disease, pop eye, dermal hemorrhages, abdominal distension, and hemorrhages at the base of fins, displayed in koi infected with spring viremia of carp virus (SVCV).

Fish biologist with Shortnose sucker

Researcher from Klamath Falls Field Station downloading data during a flood on the Williamson River Oregon.

Juvenile Chinook salmon monitoring below the The Dalles Dam on the Columbia River.

Juvenile herring with classic signs of VHS including focal hemorrhaging around the eyes, mouth, and fin bases.

Researcher, works at the microscope, Marrowstone Marine Field Station, Nordland, WA.

Juvenile white sturgeon held by human hand. Columbia River, bottom trawl for yoy indexing.

Weighing a juvenile white sturgeon. Columbia River, bottom trawl for yoy indexing.

Researchers surgically implanting transmitter, white sturgeon, for passage study. Columbia River near The Dalles Dam.

Researchers surgically implanting transmitter, white sturgeon, for passage study. Columbia River near The Dalles Dam.

Researchers preparing to surgically implant transmitter, white sturgeon, for passage study. Columbia River near The Dalles Dam.

Gary Barton (USGS) and Jeff Laufle (U.S. Army Corps of Engineers) carried out a particle size analysis of the surface riverbed material on the right bank (facing downstream) of the Snake River about three miles below Ice Harbor Dam near Burbank, WA.

Image of the Western Fisheries Research Center, Marrowstone Marine Field Station.  Looking east toward Puget Sound.