Western Fisheries Research Center

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.

 Related image

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.

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

Downloading data during a flood on the Klamath River.

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.