Demographic and habitat requirements for conservation of bull trout /

mas 1992).Scudder ( 1989) argues that populations can represent an important source of the genetic variation that is critical to the long-term persistence of populations.Northcote (1993) made a similar argument for resident and migratory populations.Variation in the timing of outmigration and in the timing and frequency of spawning also represents diversity in Ufe history.Most information indicates bull trout mature when they are between 5 and 7 years of age (Brown 1992;Fraley and Shepard 1989;