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MILJØ2015-Norsk miljøforskning mot 2015

VANN: Mapping short and long term migration pattern of North Norwegian Atlantic salmon at sea

Tildelt: kr 3,9 mill.

The marine phase is assumed to have the major influence on variations in population abundances of Atlantic salmon. However, compared to the freshwater phase, knowledge of marine life-history is scare and completely lacking for most populations. In recent years, important information regarding marine migrations of a few southern populations has been obtained. However, little or no comparative information exists from northern populations, but they are hypothesized to have different migration behaviour both within fjords and utilizing different areas in the open ocean. Owing to the importance of the initial life-history stage of post-smolts at sea, and the lack of information regarding ocean migrations of northern salmon populations, the focus of this projec t is to estimate early survival and migration behaviour of wild post-smolt in (i) a typical southern and (ii) northern fjord system with different morphological and oceanographic characters, and (iii) the long term open ocean migrations of adult northern salmon. We will use advanced telemetry methods within the fjords, and a new tool for analyzing combined information from data logger tags with high resolution sea surface data (SST) for estimating migration routes in the open ocean. This approach will gen erate new and basic knowledge important for future management of salmon populations, and contribute to a better understanding of the oscillations in returning rates of adult salmon on different geographical scales. The study will include a PhD project and cooperation with several national and international research institutes as well as generating synergetic effects by mutual use of data and equipment from other projects.

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MILJØ2015-Norsk miljøforskning mot 2015