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Download PDF by National Research Council, Division on Earth and Life: Atlantic Salmon in Maine

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By National Research Council, Division on Earth and Life Studies, Ocean Studies Board, Board on Environmental Studies and Toxicology, Committee on Atlantic Salmon in Maine

ISBN-10: 0309091357

ISBN-13: 9780309091350

ISBN-10: 0309529778

ISBN-13: 9780309529778

As a result pervasive and sizeable decline of Atlantic salmon populations in Maine over the last one hundred fifty years, and since they're as regards to extinction, a complete statewide motion may be taken now to make sure their survival. The populations of Atlantic salmon have declined vastly, from an predicted part million grownup salmon returning to U.S. rivers every year within the early 1800s to maybe as few as 1,000 in 2001. The record recommends enforcing a formalized decision-making method of identify priorities, evaluation strategies and coordinate plans for protecting and restoring the salmon.

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It was not recognized then that the small parr in the streams were members of the same species. Understanding the life cycle of Atlantic salmon is complicated by their alternative life-history strategies. For example, before reproductive maturity, these alternatives include variable durations in the stages before their seaward migration and variable numbers of years growing in the ocean (see Table 2-2). Reproductive alternatives include variable age and size at maturity, variable timing of homeward migrations to spawn, variable number of years of spawning, and variable fecundity between years.

It will evaluate and describe options for enhancing their continued survival and recovery and will provide some approximate estimates of the relative costs of the various options. SALMON BIOLOGY Naturally reproducing populations of Atlantic salmon occur in rivers and streams from southwestern Maine to northwestern Europe. Historically, they were found in the Hudson River in New York and north and east to the Canadian border, but today they are found only in Maine, from the Sheepscot River to the Canadian border.

The committee addressed the question at three levels. First, are North American Atlantic salmon genetically different from European salmon? Second, are Maine salmon distinct from Canadian salmon? Third, to what degree are salmon populations in the eight Maine rivers in the ESA listing distinct from each other? The committee concluded that North American Atlantic salmon are clearly distinct genetically from European salmon. In addition, despite the extensive additions of nonnative hatchery and aquaculture genotypes to Maine’s rivers, the evidence is surprisingly strong that the wild salmon in Maine are genetically distinct from Canadian salmon.

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Atlantic Salmon in Maine by National Research Council, Division on Earth and Life Studies, Ocean Studies Board, Board on Environmental Studies and Toxicology, Committee on Atlantic Salmon in Maine


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