By Øystein Aas, Anders Klemetsen, Sigurd Einum, Jostein Skurdal
The Atlantic salmon is among the such a lot prized and exploited species all over the world, being on the centre of a tremendous 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 overlaying all significant elements of the connection of the Atlantic salmon with its setting, chapters comprise info of migration and dispersal, copy, habitat standards, feeding, progress premiums, pageant, predation, parasitsm, inhabitants dynamics, results of panorama use, hydro energy improvement, weather switch, and exploitation. The ebook closes with a precis and think about attainable destiny study directions.Backed by means of the Norwegian study Council and with editors and individuals widely recognized and revered, Atlantic Salmon Ecology is a vital buy for all these operating with this species, together with fisheries scientists and bosses, 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 study institutions the place those matters are studied and taught must have copies of this crucial publication.Comprehensive and updated insurance of Atlantic SalmonAtlantic Salmon is without doubt one of the world's such a lot commercially very important speciesBacked via the Norwegian learn CouncilExperienced editor and the world over revered individuals
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Increased survival at increased temperatures may also be linked to increased prey availability, and perhaps also to increased swimming performance and predator avoidance at higher temperatures (Rikardsen et al. 2004; Hvidsten et al. 2009). In the southern part of the distribution range, such as in Spain, sea temperatures rarely fall below 11 °C during the smolt migration (Javier Lobon Cervia pers. ). The smolt migration usually extends over a 3–7 week period between April and July, with the earliest timing in southern populations (Stewart et al.
2005; Scruton et al. 2007). At some power stations, fish may be further delayed if they must pass an associated dam and fishway (Chanseau & Larinier 1998; Karppinen et al. 2002). River regulation sometimes reduces water discharge on certain river sections, for example downstream of power station or fish farm intakes, or downstream of interbasin water transfers. River sections with reduced water discharge may extend over many kilometres, and the reduction in water discharge may be considerable. Salmon may have problems finding and entering such river sections, and once they have entered, they may be further delayed in passing through them (Lundqvist et al.
1998; Davidsen et al. 2005). 2 to 28 km day−1 (Ruggles 1980). Individual migration speeds may even reach 60 km day−1 (Aarestrup et al. 2002). The speed of downstream migration appears slower in small streams than in large rivers (Ruggles 1980). Downstream migrating smolts often utilise the middle part of the river channel with the highest water velocity, and they appear to move actively out into the main current of the river to avoid being caught in backwaters and sloughs (Hansen & Jonsson 1985; Davidsen et al.