OBJECTIVES AND EXPECTED ACHIEVEMENTS
The problems to be addressed Salmon display great plasticity in the age at which they migrate to sea, the age at which they mature, and the occurrence of repeat spawning. This may lead to significant overlap of generations. Additionally, because of their diadromous life cycle and varied oceanic migration behaviour, physical/temporal overlap occurs in oceanic and home-water fisheries, many of which exploit salmon from more than one river stock.
While biological information can be gathered on fish numbers in rivers with monitoring programmes, and in coastal and high seas fisheries, it is very difficult at present to relate this to production at the population level and to advise managers on how many fish can be safely caught nationally, regionally, or locally, while still fulfilling long-term management goals.
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