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

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

The Atlantic salmon is likely one of the such a lot prized and exploited species world wide, 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 e-book, either scientifically vital and visually appealing. Comprehensively masking all significant elements of the connection of the Atlantic salmon with its atmosphere, 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 switch, and exploitation. The booklet closes with a precis and consider attainable destiny study directions.Backed through the Norwegian examine Council and with editors and participants well known and revered, Atlantic Salmon Ecology is an important 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 body 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 up to date insurance of Atlantic SalmonAtlantic Salmon is likely one of the world's so much commercially vital speciesBacked via the Norwegian learn CouncilExperienced editor and the world over revered individuals

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2005). Smolts may not need a period of acclimatisation because they have previously, while still in fresh water, become modified physiologically to tolerate saline conditions (Hoar 1988). The migration of smolts through the estuaries occurs mainly at night and during ebb tides, with the smolts swimming close to the surface, which is often the fastest-moving section of the water column (Moore et al. 1995; Lacroix et al. 2004). Predation on seaward-migrating salmonid smolts can be significant (Hvidsten & Lund 1988; Jepsen et al.

Post-smolts can travel rapidly over long distances, as tagged individuals recaptured in the Faroe-Shetland Channel had covered 713–874 km during the 38–51 days after they were released in rivers as smolts, corresponding to a minimum progression rate of 7–30 km day−1 (Shelton et al. 1997). Similar recapture data from the North Sea, the Norwegian Sea and the Barents Sea have shown minimum progression rates of between 6 and 26 km day−1 (Holm et al. 2003). Multi-sea-winter salmon may move farther away from home than grilse (Hansen & Quinn 1998).

Confronted with these stressors, the fish showed avoidance behaviour, escaping to points either upstream Aquatic Nomads: The Life and Migrations of the Atlantic Salmon 19 or downstream of the pollution source, and in some cases even leaving the river. However, when fish are not able to detect and avoid water pollution, survival and reproduction may be affected. Intrinsic factors Maturation stage, energy state, hormonal control and stress level may all be physiological factors influencing and in some instances controlling the upstream migration pattern.

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