Abstract: Migratory trout (sea trout) and sedentary trout (freshwater trout) coexist and interbreed. However, the mechanisms underlying the development of the migrant morphotype are still unclear. At one point parr–smolt transformation is initiated and, as a result, juvenile trout are ready to leave the river and migrate to the sea. The smoltification process has been linked to various factors such as body size, growth rate and the physiological state of the fish. In addition, the process is also strongly influenced by environmental factors such as yea...
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Topics: 
Fishery
Ecology
Zoology