By Øystein Aas, Anders Klemetsen, Sigurd Einum, Jostein Skurdal
The Atlantic salmon is without doubt one of the so much prized and exploited species around the world, being on the centre of a tremendous activities fishing and more and more because the significant farmed species in lots of international locations worldwide.Atlantic Salmon Ecology is a landmark e-book, either scientifically very important and visually beautiful. Comprehensively overlaying all significant elements of the connection of the Atlantic salmon with its setting, chapters comprise info of migration and dispersal, replica, habitat standards, feeding, progress premiums, pageant, predation, parasitsm, inhabitants dynamics, results of panorama use, hydro energy improvement, weather swap, and exploitation. The publication closes with a precis and think about attainable destiny learn directions.Backed by way of the Norwegian study 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 bosses, 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 learn institutions the place those matters are studied and taught must have copies of this significant publication.Comprehensive and updated insurance of Atlantic SalmonAtlantic Salmon is likely one of the world's such a lot commercially vital speciesBacked by means of the Norwegian examine CouncilExperienced editor and across the world revered members
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8 Fishways of various designs have been provided in many river systems to facilitate upstream passage of Atlantic salmon past power stations and other migration barriers. However, they may not always be successful in facilitating migration, and the fishway itself may act as an obstacle and delay upstream progress. Photo: Eva B. Thorstad. more important in stimulating upstream migration in smaller rivers (Solomon et al. 1999) and past challenging migration barriers. To allow a successful passage by Atlantic salmon past any particular riffle, waterfall or other migration barrier, water discharge often has to be within a site-specific range (Jensen 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. However, daytime migration using visual cues may be preferable for the smolts without considering the predation risk, and daytime migration may be safer at higher water temperatures when smolt escape responses are faster, and maybe also as the body silvers.
Generally, there is a tendency for large multi-sea-winter salmon to enter the rivers earlier in the season than smaller one-sea-winter fish (grilse) (Power 1981; Jonsson et al. 1990). In some rivers in Denmark, Scotland and other parts of the United Kingdom, salmon can enter the rivers in all months of the year, with some individuals entering more than a year prior to spawning (Johansen & Løfting 1919; Klemetsen et al. 2003). In certain Russian rivers, there is a summer run of salmon spawning the same year, and an autumn run of salmon that remains in the river until the spawning period the year after river entry (Berg 1935).