By Øystein Aas, Anders Klemetsen, Sigurd Einum, Jostein Skurdal
The Atlantic salmon is likely one of the such a lot prized and exploited species all over the world, being on the centre of a big activities fishing and more and more because the significant farmed species in lots of international locations worldwide.Atlantic Salmon Ecology is a landmark booklet, either scientifically vital and visually appealing. Comprehensively masking all significant elements of the connection of the Atlantic salmon with its setting, chapters contain information of migration and dispersal, copy, habitat necessities, feeding, development charges, festival, predation, parasitsm, inhabitants dynamics, results of panorama use, hydro energy improvement, weather swap, and exploitation. The e-book closes with a precis and think about attainable destiny learn directions.Backed by means of the Norwegian examine Council and with editors and participants 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 natural world division group of workers and regulatory our bodies. Libraries in all universities and study institutions the place those topics are studied and taught must have copies of this crucial publication.Comprehensive and up to date insurance of Atlantic SalmonAtlantic Salmon is without doubt one of the world's so much commercially vital speciesBacked by means of the Norwegian learn CouncilExperienced editor and the world over revered participants
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Extra resources for Atlantic Salmon Ecology
1998; Rikardsen & Dempson 2011 [Chapter 5]). Within a given watershed, smolts from upper tributaries generally begin migration earlier than those from lower tributaries. This results in a synchronised sea entry for smolts from within the entire watershed (Stewart et al. 2006). It is believed that smolts use different environmental cues in the rivers that are predictably correlated with favourable ocean conditions to control movements so that they arrive at sea at an appropriate time (Hvidsten et al.
Many self-sustaining populations have disappeared or are endangered due to human impacts, and the species range has generally contracted and fragmented (WWF 2001; Webb et al. 2007). Nearly 90% of the known healthy populations are now found in four countries (Norway, Iceland, Scotland and Ireland; WWF 2001). In the remainder of the range, 85% of the populations are categorised as vulnerable, endangered or critical, and the species is on the brink of extinction in Portugal, Estonia, Poland, the United States and southern parts of Canada.
Maximum potential swimming speeds in fish depend on body length (Beamish 1978; Videler & Wardle 1991), among other factors. Maximum swimming speeds for Atlantic salmon grilse (50–60 cm body length) are at least 4 m s−1, or 8 body lengths s−1, according to laboratory studies over 18–20 m distances (Booth et al. 1996; Colavecchia 1998). 4 body lengths s−1, were reported for larger salmon (75–85 cm body length) by Beamish (1978). Maximum swimming speeds in nature are likely to be higher than those recorded under laboratory conditions.