12738 – Bull Trout Restoration in Crater Lake National Park, Oregon

Investigator’s Annual Reports (IAR’s) for Crater Lake National Park

Bull Trout Restoration in Crater Lake National Park, Oregon


Report Number: 12738

Permit Number: CRLA1993AHDT

Date Received: Jan 01, 1998

Reporting Year: 1993

Principal Investigator: Mark Buktenica, National Park Service, Crater Lake National Park

Park-assigned Study Id. # CRLA1993AHDT

Permit Expiration Date: Jan 01, 1998

Permit Start Date: Jan 01, 1998

Study Starting Date: Jan 01, 1993

Study Ending Date: Jan 01, 1993

Study Status: Completed

Activity Type: Other

Subject/Discipline: Fish / Ichthyology

Objectives: Restore native bull trout to historic distribution in Sun Creek, remove non-native brook trout, and prevent re-invasion of non-native species in the future.

Findings and Status: The number of adult bull trout appeared to decline in 1993. An increase in adults would not be expected, however, until 1994 or 1995 as the reproductive year classes grow to adult size. Young of the year were not enumerable using non-destructive sampling techniques. The bull trout peer review panel met again in the fall of 1993. The panel reviewed the recovery strategy and concluded that recovery efforts have not negatively effected the bull trout population. It remains to be seen if the bull trout status was discovered early enough for recovery efforts to be effective.

For this study, were one or more specimens collected and removed from the park but not destroyed during analyses? No

Funding provided this reporting year by NPS: 37000

Funding provided this reporting year by other sources: 5000

Full name of college or university: n/a

Annual funding provided by NPS to university or college this reporting year: 0



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