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

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

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

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Extra resources for Atlantic Salmon in Maine

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Many rivers now contain nonnative species of fish, some of which are strongly piscivorous. Ocean fishing has changed the composition and food supply of potential salmon predators. In addition, protection afforded to marine mammals under the Marine Mammal Protection Act has resulted in increases in species that prey on salmon. Finally, the human depletion of salmon populations might have made them more vulnerable to other predators. These changes have probably also affected the kinds and amount of food available to salmon at various life stages.

Maine’s Atlantic salmon exhibit two run timings that are in part influenced by genetic factors. 3%); also estimates of <10% 1SW with >95% males Alternative: multiple sea winters (MSW, such 2SW, 3SW) Reproduction Age at maturity Primary: fifth fall of life Alternative: genetics and environment lead to alternatives Timing of migration to natal streams River dependent Early runs from May to mid-July Late runs from mid-July through September Spawning frequency Primary: Semelparity—spawn only once, then die Alternative: Iteroparity or repeated spawns Alternative: Precocious male parr constitute a large percent, which varies widely among rivers and years SALMON LIFE HISTORY AND ECOLOGY 33 May and mid-July, and “late-run” adults enter freshwater later in the summer.

However, the trauma associated with capturing, handling, anesthetizing, and sampling fluids and tissues from fish—especially young fish—can result in some deaths. When populations are very small, as they now are in most Maine rivers, it is essential to weigh the value of new information against the possibility of the harm to wild fish caused by handling. Governance Governance institutions have a strong influence on the success or failure of management of natural resources in general, as they do for anadromous Atlantic salmon in Maine.

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