By Øystein Aas, Anders Klemetsen, Sigurd Einum, Jostein Skurdal
The Atlantic salmon is without doubt one of the such a lot prized and exploited species around 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 beautiful. Comprehensively masking all significant features of the connection of the Atlantic salmon with its atmosphere, chapters comprise information of migration and dispersal, replica, habitat standards, feeding, development charges, festival, 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 via the Norwegian learn Council and with editors and members widely recognized 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 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 examine CouncilExperienced editor and across the world revered individuals
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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. 2009). This may account for the differences among populations in which environmental cues are the key triggers of downstream migration.
Fluctuating water levels may have more pronounced effects in small than large rivers. The stimulating effect of increased water discharge is also found in many large rivers where water discharge seems not to be a limiting physical factor of further upstream migration. The role of discharge in these systems is more difficult to explain (Thorstad et al. 1998). However, it is possible that increased discharge is not important to stimulate the salmon to enter the river per se, but rather that increased freshwater supply to near-coastal areas may help the salmon to recognise and find their natal river, increasing the number of fish entering fresh water compared to low flow periods.
2005). Social cues, such as the presence of other migrants in the river, may also be important (Hansen & Jonsson 1985; Hvidsten et al. 1995). The timing of the spring migration has an important role in determining smolt survival in the marine environment (McCormick et al. 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.
Atlantic Salmon Ecology by Øystein Aas, Anders Klemetsen, Sigurd Einum, Jostein Skurdal