By Øystein Aas, Anders Klemetsen, Sigurd Einum, Jostein Skurdal
The Atlantic salmon is without doubt one of the such a lot prized and exploited species around the globe, being on the centre of a huge activities fishing and more and more because the significant farmed species in lots of nations worldwide.Atlantic Salmon Ecology is a landmark book, either scientifically vital and visually appealing. Comprehensively protecting all significant elements of the connection of the Atlantic salmon with its surroundings, chapters contain information of migration and dispersal, replica, habitat standards, feeding, progress charges, festival, predation, parasitsm, inhabitants dynamics, results of panorama use, hydro strength improvement, weather switch, and exploitation. The ebook closes with a precis and consider attainable destiny study directions.Backed by way of the Norwegian examine Council and with editors and participants well known and revered, Atlantic Salmon Ecology is an important buy for all these operating with this species, together with fisheries scientists and executives, fish biologists, ecologists, physiologists, environmental biologists and aquatic scientists, fish and natural world division team of workers and regulatory our bodies. Libraries in all universities and examine institutions the place those matters are studied and taught must have copies of this crucial publication.Comprehensive and up to date assurance of Atlantic SalmonAtlantic Salmon is likely one of the world's such a lot commercially vital speciesBacked through the Norwegian learn CouncilExperienced editor and the world over revered participants
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Additional resources for Atlantic Salmon Ecology
Salmon populations are also found in rivers in the United Kingdom (UK), Iceland, Ireland and Greenland (only one river). The feeding areas in the sea cover large areas of the North Atlantic Ocean (Fig. 6; Rikardsen & Dempson 2011 [Chapter 5]). Salmon populations where the entire life cycle is completed in fresh water (termed ‘freshwater resident’) occur in both North America and Europe. In North America, they are common throughout the entire distribution range. In Europe, freshwater resident populations occur in rivers and lakes of Russia (Lakes Ladoga, Onega, Kuito and at least six other lakes), Finland (Lake Saimaa), Sweden (Lake Vänern) and Norway (River Namsen, Lake Byglandsfjord) (Kazakov 1992).
However, migration pauses of up to one month have been recorded under natural waterfalls (Johnsen et al. 1998). The fish may not necessarily remain stationary in the pool below the waterfall during this period, but may make local movements in river stretches below the waterfall. In some river systems, salmon must pass through natural lakes before reaching the spawning grounds. There is little information on the migration pattern or speeds of Atlantic salmon through lakes. 3 How fast can an adult Atlantic salmon swim and how high can it jump?
Individuals may spawn seven or more times during their lifetime, but most individuals survive to spawn only once or twice (Fleming 1996). Furthermore, some young males may, prior to migrating to sea for the first time, mature sexually as parr (‘precocious parr’). They produce viable sperm, but these small males are of little interest to large females and do not exhibit courtship behaviour. Instead, they ‘sneak spawn’ near pairs of large fish as the females release their eggs into their gravel nests.