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Genetic Status of Atlantic Salmon in Maine Interim Report from the Committee on Atlantic Salmon in Maine (2002) / Chapter Skim
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2 Biology and Evolution of Atlantic Salmon
Pages 10-14

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From page 10...
... Unlike their Pacific cousins, which always die after spawning, some Atlantic salmon survive spawning and return to sea, either soon after spawning or the following spring (~-6% according to Baum 9974. Some of these fish might spawn again.
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From page 11...
... Today, wild Atiantic salmon populations in the United States are found only in Maine,2 from the lower Kennebec River in the southwest to the Canadian border. Maine's salmon take part in extensive marine migrations, including movements to the waters off western Greenland!
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From page 12...
... This pattern leads to a kind of double jeopardy and complicates understanding ofthe factors that affect their populations. The pattern of homing to their natal streams leads to a variety of local adaptations, including the timing of spawning runs, growth rates, and other life-history features (e.g., Gharrett and Smoker ~ 993, NRC ~ 996, and Smoker et al.
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From page 13...
... 13 ° E E, - ·— ~ ~ ~ ~ ~ C ~ ~ ~ ~ ~ ~ W' ~m -- -- - -~ , =-~1111lll ill ~ a, ~ \c, 8 ~ ~ ~ ° ~-11 i.
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From page 14...
... The complex physiological transition to salt water at the smoTt stage requires suites of behavioral adaptations for navigation and avoidance of predators, including seals, cormorants, and striped bass, and for finding marine foods, including invertebrates and fish. Survival of smolt to 2SW stage would have to be about 2% (based on Baum's estimate of 90 smolts produced per female)
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Key Terms

  • salmon populations
  • fresh water
  • pacific salmon
  • enter fresh
  • canadian border

  • wild salmon
  • pacific cousins
  • adults enter
  • salmon species
  • local adaptations

  • periods near
  • freshwater streams
  • considerable exchange
  • ice age
  • stage requires

  • kennebec river
  • strong homing
  • following spring
  • wild breeding
  • behavioral adaptations

  • hudson river
  • survive spawning
  • mature parr
  • extensive periods
  • finding marine

  • earlier nrc
  • distinct physical
  • strong selection
  • smolt stage
  • salmon survive


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