New PDF release: Atlantic Salmon Ecology

By Øystein Aas, Anders Klemetsen, Sigurd Einum, Jostein Skurdal

ISBN-10: 1405197692

ISBN-13: 9781405197694

The Atlantic salmon is among the such a lot prized and exploited species around the world, being on the centre of an important activities fishing and more and more because the significant farmed species in lots of international locations worldwide.Atlantic Salmon Ecology is a landmark book, either scientifically very important and visually beautiful. Comprehensively protecting all significant facets of the connection of the Atlantic salmon with its setting, chapters comprise information of migration and dispersal, copy, habitat requisites, feeding, development charges, festival, predation, parasitsm, inhabitants dynamics, results of panorama use, hydro strength improvement, weather switch, and exploitation. The booklet closes with a precis and examine attainable destiny study directions.Backed by means of the Norwegian learn Council and with editors and individuals well known and revered, Atlantic Salmon Ecology is a vital 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 flora and fauna division body of workers and regulatory our bodies. Libraries in all universities and examine institutions the place those topics are studied and taught must have copies of this significant publication.Comprehensive and updated assurance of Atlantic SalmonAtlantic Salmon is likely one of the world's so much commercially very important speciesBacked via the Norwegian examine CouncilExperienced editor and the world over revered individuals

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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. 2005; Svendsen et al. 2007). Smolts often migrate in near-surface waters, but sometimes they may occur in the deeper portions of the water column (Hesthagen & Garnås 1986; Hvidsten & Johnsen 1997; Davidsen et al.

4 Smolt and post-smolt migration – from juvenile life in the river to feeding in the ocean The Atlantic salmon smolt migration occurs in the spring and early summer. Before moving to the ocean, the fish undergo a smolting process involving a number of preparatory morphological, biochemical, physiological and behavioural changes that preadapt them for life in high-salinity water and for covering very long distances (Hoar 1988; Høgåsen 1998; Thorpe et al. 1998; Finstad & Jonsson 2001). The morphological changes include a slimmer body form, darkened fins and obliterative shading, with a dark back, white belly and silver sides helping to conceal the fish in the pelagic environment.

Rikardsen & Kim Aarestrup Abstract The Atlantic salmon Salmo salar L. is native to the temperate and subarctic regions of the North Atlantic Ocean. The species has a complex and diverse array of life-histories, but most forms are anadromous with a juvenile phase in fresh water, followed by smoltification and a long migration to the ocean for feeding and growth, and a return migration to fresh water to spawn. Atlantic salmon return with a high precision to their home river, and typically only a small percentage of a population strays to other rivers.

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Atlantic Salmon Ecology by Øystein Aas, Anders Klemetsen, Sigurd Einum, Jostein Skurdal


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