Protecting healthy fish stocks : a Pacific Northwest approach / Guido R. Rahr III.
Material type:
TextPublication details: Portland, OR : 1997.Description: 18 p. : map ; 28 cmOnline resources: Abstract: The Pacific Northwest was once among the greatest salmon and steelhead producing regions on earth. But within the last 150 years the cumulative effects of overharvest, habitat loss, hydroelectric development and aggressive fish hatchery programs have caused the decline and extinction of salmon and steelhead stocks over most of their range south of Canada (see Nehlsen et al. 1991, Kaczynski and Palmisano 1994, Botkin et al.1995, Nawa in preparation). The magnitude of the salmon problem became clear in 1991 when Willa Nehlsen and two other researchers completed a study that identified 214 native stocks in California, Oregon, Idaho and Washington that were facing a high or moderate risk of extinction, or were of special concern. Of these, 101 stocks were found to be at high risk of extinction, i.e. populations whose spawning escapements are declining or have had annual escapements below 200 fish within the previous five years (Nehlsen et al. 1991). Other studies have identified 100 addi
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Electronic Report
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Electronic Library | Non-fiction | RAH (Browse shelf(Opens below)) | Available | 2644 |
Includes bibliographical references (p. 14-18).
The Pacific Northwest was once among the greatest salmon and steelhead producing regions on earth. But within the last 150 years the cumulative effects of overharvest, habitat loss, hydroelectric development and aggressive fish hatchery programs have caused the decline and extinction of salmon and steelhead stocks over most of their range south of Canada (see Nehlsen et al. 1991, Kaczynski and Palmisano 1994, Botkin et al.1995, Nawa in preparation). The magnitude of the salmon problem became clear in 1991 when Willa Nehlsen and two other researchers completed a study that identified 214 native stocks in California, Oregon, Idaho and Washington that were facing a high or moderate risk of extinction, or were of special concern. Of these, 101 stocks were found to be at high risk of extinction, i.e. populations whose spawning escapements are declining or have had annual escapements below 200 fish within the previous five years (Nehlsen et al. 1991). Other studies have identified 100 addi