By Øystein Aas, Anders Klemetsen, Sigurd Einum, Jostein Skurdal
The Atlantic salmon is likely one of the so much prized and exploited species world wide, being on the centre of an enormous activities fishing and more and more because the significant farmed species in lots of international locations worldwide.Atlantic Salmon Ecology is a landmark ebook, either scientifically vital and visually appealing. Comprehensively masking all significant elements of the connection of the Atlantic salmon with its surroundings, chapters comprise information of migration and dispersal, copy, habitat requisites, feeding, progress premiums, pageant, predation, parasitsm, inhabitants dynamics, results of panorama use, hydro energy improvement, weather switch, and exploitation. The booklet closes with a precis and examine attainable destiny study directions.Backed via the Norwegian learn Council and with editors and participants widely recognized and revered, Atlantic Salmon Ecology is a necessary 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 group of workers and regulatory our bodies. Libraries in all universities and learn institutions the place those matters are studied and taught must have copies of this crucial publication.Comprehensive and updated assurance of Atlantic SalmonAtlantic Salmon is without doubt one of the world's such a lot commercially very important speciesBacked by means of the Norwegian study CouncilExperienced editor and across the world revered members
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1, Fig. 4 Small Atlantic salmon parr may be rather stationary, but large parr may not be as stationary as previously thought and utilise larger areas in the river. Movements over a 22–383 m-long river stretch have been recorded for individuals (mean home range 1300 m2, Økland et al. 2004). Photo: Audun Rikardsen. 2). Although most Atlantic salmon undertake marine migrations, some populations complete their entire life cycle in fresh water (Fig. 3), while others may undertake only short migrations to brackish water in estuaries, or stay within geographical areas closer to the river such as in the Inner Bay of Fundy and the Baltic Sea (Klemetsen et al.
Smolt migration usually takes place at night, but towards the end of the migration period it may take place both night and day (Hansen & Jonsson 1985; Hvidsten et al. 1995; Ibbotson et al. 2006). This diel migration pattern is likely to be linked to water temperature, with nocturnal migration occurring at temperatures up to approximately 12 °C, and an increasing proportion of the population migrating during daytime at higher temperatures (Veselov et al. 1998; Ibbotson et al. 2006). Nocturnal migration at low temperatures is thought to be an adaptive behaviour to avoid visual predators.
2008). However, the migration is active, with an overall seaward vector. Hedger et al. (2008) found that swimming speed was greater during the daytime than at night, and suggested that this pattern was consistent with post-smolts migrating offshore nocturnally and using daytime for prey detection and predator avoidance. They also found that exposure to more saline waters increased swimming speeds. 3 days covering the same distance (Thorstad et al. 2007b). 53 body lengths per second for wild post-smolts).