J.H. Petersen

35 items:

System-wide significance of predation on juvenile salmonids in the Columbia and Snake River reservoirs. Annual report 1991 No abstract available Categories: Publication; Types: Citation
Survival estimates of migrant juvenile salmonids in the Columbia River from John Day Dam through Bonneville Dam using radio-telemetry. Annual report 2000 Abstract not available Categories: Publication; Types: Citation
Bigger is not always better for overwintering young-of-year steelhead Many fishes occur across broad ranges of latitude and elevation, where winter temperatures can vary from mild to harsh. We conducted a laboratory experiment with three sizes of age-0 steelhead Oncorhynchus mykiss to examine growth, condition, and energy reserves under low rations at three levels of water temperature typical of this species' distribution during winter. At the end of the 111-d experiment, all three starting sizes of age-0 steelhead (small, 2-3 g; medium, 3-4 g; large, 4-5 g) held in 3??C water had lower total lipid weight than those held in 6??C and 9??C water. Large fish had higher total lipid weight than small fish at the onset of the experiment and retained higher amounts at the end. However, large... Categories: Publication; Types: Citation; Tags: Transactions of the American Fisheries Society
Estimating the survival of juvenile salmonids passing through The Dalles Dam using radio-telemetry, 2002 Abstract not available Categories: Publication; Types: Citation
Resident fish assemblages in shallow shorelines of a Columbia River impoundment During May-September 1995, we replicated an earlier (1984-85) study of fishes in shoreline habitats of the John Day Reservoir, Columbia River, to investigate fish assemblage structure at several spatial and temporal scales. A total of 37,400 resident fishes representing 24 taxa was collected in 359 beach seine hauls. Fish catch composition during 1984 and 1985 was very similar, but was greatly different from catch in 1995. During 1984-1985, four native taxa (chiselmouth, northern pikeminnow, suckers, and sand rollers) constituted more than 90% of the combined main-channel catch, with introduced taxa comprising only 1.3% of the main-channel catch. In contrast, during 1995 only 37.7% of the main-channel catch comprised... Categories: Publication; Types: Citation; Tags: Northwest Science

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