Bozeman Fish Health Center

The pallid sturgeon was first recognized as a species different from shovelnose sturgeon by S. A. Forbes and R. E. Richardson in 1905 based on a study of nine specimens collected from the Mississippi River near Grafton, Illinois (Forbes and Richardson 1905). They named this new species...

The Kootenai River white sturgeon (Acipenser transmontanus) is 1 of 18 land-locked populations of white sturgeon known to occur in western North America. Kootenai sturgeon occur in Idaho, Montana, and British Columbia, Canada, and are restricted to approximately 167.7 River Mile (RM) of the...

Greenback cutthroat trout are coldwater fish belonging to the trout, salmon and whitefish family. They have dark, round spots on the sides and tail and two colorful blood-red stripes on each side of the throat under the jaw, hence the name "cutthroat." During the spring spawning season the...

The Bonneville cutthroat trout (Oncorhynchus clarki utah) is a subspecies of Cutthroat trout that once inhabited the Late Pleistocene-aged Lake Bonneville of Utah, eastern Nevada, and Southern Idaho (USA). Since the desiccation of Lake Bonneville into Great Salt Lake which is too salty for any...

Steelhead trout (Oncorhynchus mykiss) belong to the family Salmonidae which includes all salmon, trout, and chars. Steelhead are similar to some Pacific salmon in their life cycle and ecological requirements. They are born in fresh water streams, where they spend their first 1-3 years of life....

Bull trout (Salvelinus confluentus) are members of the family Salmonidae and are char native Washington, Oregon, Idaho, Nevada, Montana and western Canada. Compared to other salmonids, bull trout have more specific habitat requirements that appear to influence their distribution and abundance....

Arctic grayling (Thymallus arcticus) is a freshwater fish in the same family (Salmonidae) as salmon, trout, and whitefish. A distinctive morphological characteristic of this fish is its large, sail-like dorsal fin. Arctic grayling is an obligate cool- or cold-water species....

Silver carp (Hypophthalmichthys molitrix) are one of four nonnative fish species belonging to a group commonly referred to as “invasive carp”. Native to eastern Asia, silver carp were introduced to the United States during the 1970’s and 1980’s to private fish farms and wastewater...

Bighead carp (Hypophthalmichthys nobilis) are native to eastern Asia and are one of four nonnative fish referred to as “invasive carp”. These fish are large, deep bodied fish that have a large head and a large toothless mouth with a protruding lower jaw. The bighead carp eyes are far...