ill.; Report title; "Prepared for: U.S. Fish and Wildlife Service, Klamath Falls, Oregon." - T.p.; Includes bibliographic references
Abstract Bull trout are the only native fish in Crater Lake National Park. In 1989, biologists discovered that bull trout had been drastically reduced, and restricted to a small section of one creek in the park because of the introduction of non-native brook trout. The bull trout's survival in the park was jeopardized due to competition and hybridization with the introduced brook trout. To ensure their survival, a bull trout restoration plan was written and reviewed by a panel of national experts in October 1991. The long-term goals of the plan were to: 1) restore the remnant population of bull trout to historic numbers and distribution in Sun Creek; 2) eradicate brook trout, and 3) prevent re-invasion of non-native fish. Restoration fieldwork began in 1992. Barriers were constructed to prevent re-invasion of non-native fish. Biologists used a combination of techniques to remove brook trout, including electroshocking, snorkel diving, trap nets, and the fish toxin Antimycin. Because of these efforts, bull trout populations increased from approximately 200 individuals in 1992 to 600 in 1999, and they have reclaimed approximately 7 miles of the creek. Complete brook trout removal from Sun Creek, with Antimycin, will be attempted in 2000. 2
Abstract Bull trout are the only native fish in Crater Lake National Park. In 1989, biologists discovered that bull trout had been drastically reduced, and restricted to a small section of one creek in the park because of the introduction of non-native brook trout. The bull trout's survival in the park was jeopardized due to competition and hybridization with the introduced brook trout. To ensure their survival, a bull trout restoration plan was written and reviewed by a panel of national experts in October 1991. The long-term goals of the plan were to: 1) restore the remnant population of bull trout to historic numbers and distribution in Sun Creek; 2) eradicate brook trout, and 3) prevent re-invasion of non-native fish. Restoration fieldwork began in 1992. Barriers were constructed to prevent re-invasion of non-native fish. Biologists used a combination of techniques to remove brook trout, including electroshocking, snorkel diving, trap nets, and the fish toxin Antimycin. Because of these efforts, bull trout populations increased from approximately 200 individuals in 1992 to 600 in 1999, and they have reclaimed approximately 7 miles of the creek. Complete brook trout removal from Sun Creek, with Antimycin, will be attempted in 2000. 2