Disclaimer:

The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.

---

Common name: Brook Trout × Bull Trout

Native Range:

Alaska	Hawaii	Puerto Rico & Virgin Islands	Guam Saipan

Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Ecology: Genetic evidence from hybrid populations suggests that hybrids are almost always sterile and experience low survival (Leary et al. 1993, Kanda 1998).

Impact of Introduction: Hybridization between Salvelinus fontinalis x confluentus can complicate efforts to control
Brook trout (S. fontinalis) and distinguish pure bull trout (S. confluentus) because hybrids are often difficult to distinguish from parental species (Popowich et al. 2011).

References: (click for full references)

Kanda, N. 1998. Genetics and conservation of bull trout: comparison of population genetic structure among different genetic markers and hybridization with brook trout. Ph.D. thesis, University of Montana, Missoula, Mont.

Leary, R.F., Allendorf, F.W., and S.H. Forbes. 1993. Conservation genetics of bull trout in the Columbia and Klamath river drainages. Conservation Biology 7(4): 856–865.

Popowich, R.C., Venturelli, P.A., Stelfox, J.D., and E.B. Taylor. 2011. Validation of morphological characteristics used for field identification of Bull Trout × Brook Trout hybrids. North American Journal of Fisheries Management 31:548-553.

Other Resources:

Author: Daniel, W.M.

This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.