Genetic Status of Atlantic Salmon in Maine Interim Report from the Committee on Atlantic Salmon in Maine (2002) / Chapter Skim
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3 Current State of Atlantic Salmon in Maine
3 Current State of Atlantic Salmon in Maine
Pages 15-21
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From page 15... ...
Fewer than i ,000 adults returned each year during the beginning of the period and in 1999 and 2000 (Figure 3~. The estimated total return for the eight streams comprising the Gulf of Maine DPS was only 75-110 adults in 2000 (John Kocik, National Marine Fisheries Service, presentation to NRC committee, June 12, 20011.
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From page 16... ...
Printed with permission of the author. STOCKING Augmentation of wild populations with hatchery releases began soon after the first major declines in Atlantic salmon in the 1870s.
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From page 17... ...
I1 age q 0~ ~,OOo9 Oo95 Age And 9~ 9~9 ~91> ~9~~ ~9; ~9~ ~9~9 ~9~ And ~9~\ ~9~ ~9- ~9~ ~99 3,500,000 2,500,000 2.000.000 1,000,000 500,000 o C 3,000,000 o C} Do z ITot I - All Ages - 1 a ............................................ : A ~ <,0~` ~ ~ Ooze ,,095 Bow cow 9~ 9~9 9~ 9~` 9; 9~ 96~9 9~ 9~` 9~\ 9~ 9~9 9~ 99` FIGURE 4 Number of Atlantic salmon stocked in Maine rivers, 1871-1995.
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From page 18... ...
Recent Period (1970 to 1992) This period was typified by an emphasis on producing and releasing smolts, assisted by the Green Lake National Fish Hatchery, and a focus on using Maine sources, primarily the Penobscot but also the Narraguagus and Machias rivers.
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From page 19... ...
and Baum (1997) concluded that the hatchery fish have not displaced the local gene pool because of the poor success of historical hatchery stocking and the likelihood that Canadian fish were poorly adapted to Maine streams.
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From page 20... ...
, its production was zero as recently as ~ 986. Five freshwater hatcheries across the state provide smolts for about 600 net-pens floating in sheltered areas, where the fish grow on food pellets broadcast into the pens and reach market size in about ~ ~ months.
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From page 21... ...
It remains unclear to what degree farm salmon have infiltrated wild populations genetically, or conversely, how resistant wild salmon have been to genetic infiltration. Based on samples taken in 1994-199S, genetic infiltration of farm fish into wild Maine populations was minimal (King et al.
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