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Maine Alewife Genetics & Demographics

Maine Alewife Genetics & Demographics. Dr. Theodore Willis University of Southern Maine. Maine Alewife Genetic Relationships. No difference genetically within Maine. Maine Alewife Genetic Relationships. Over 2.5 Million fish stocked in truck-n-transfer restoration. Androscoggin. Kennebec.

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Maine Alewife Genetics & Demographics

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  1. Maine Alewife Genetics & Demographics Dr. Theodore Willis University of Southern Maine

  2. Maine Alewife Genetic Relationships No difference genetically within Maine

  3. Maine Alewife Genetic Relationships Over 2.5 Million fish stocked in truck-n-transfer restoration Androscoggin Kennebec

  4. Reduced Diversity in Maine Fisheries lose contribution from larger watersheds Coastal ponds become main location of harvest Hall et al. 2012. Bioscience.62: 723–731

  5. Overharvest on an International Scale A. Jordaan, 2012

  6. Alewife Demographics: Survival

  7. St. Croix Alewife Demographics Could not calculate for 4 of 11 years S= 61% 35.3% 26%

  8. St. Croix Alewife Demographics

  9. Maine Alewife Demographics: 2010 Caution Concern

  10. Maine Alewife Demographics: 2010 • Data are based on 1 year only • Nemasket: Strong, long duration run in MA. No dam history. Light harvest pre-closure • Kennebec R. and StG River are composites of all sites from that drainage. • Caution sites: • Percent Annual Survival rate overlapping 10%. • Be aware of harvest conditions. • Concern sites: • Only two year classes found over or including age 3. • Steep decline from age 3 to 4 or 4 to 5. • Recheck demographics soon. Consult with DMR on long term survival rate. • All sites: • What can YOU do differently to increase survival of the oldest, most productive fish?

  11. Maine Alewife Demographics: 2010

  12. St. Croix Alewife Demographics Alewife count (Thousands) Annual Percent Survival

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