Endangered Species Management Chapter 16

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Endangered Species ManagementChapter 16
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Protected Fishes

• 743 native species in US Canada
• 418 species (56) receive some degree of
  endangered species protection
• 235 species (32) are fully protected in all or
  part of their range by some governmental agency

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The Problems

• Habitat modification (98)
• Other natural, human factors (intro of exotics)
  (37)
• Restricted range (16)
• Overexploitation (3)
• Disease (2)

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The Result
Blue pike

• 27 species, 13 subspecies have gone extinct in
  North America in past century

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Todays Endangered/Threatened Species
Blue pike

• 80 in SW or SE United States
• 60 are stream fishes (90 warmwater)

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Problem Areas

• Death Valley - water withdrawals

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Problem Areas

• Colorado River basin - habitat loss/modification,
  introduction of nonnative species

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Problem Areas

• Western trouts - introgression with nonnative
  trout

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Management Today

• Maintain/enhance historic populations
• Protect, expand, restore habitat
• Move specimens to refugia

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Management Today

• Rear/stock in additional habitats
• Minimize conflict with nonnative species
• Control exploitation

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Todays Trend

• Movement away from single-species approach to
  ecosystem approach
• Inherent need to recognize importance of nongame
  fishes