This fresh take farmed salmon pdf is about a particular kind of fish. However, populations of several species are restricted to fresh water through their lives. Various species of salmon display anadromous life strategies while others display freshwater resident life strategies.
The percent of straying depends on the species of salmon. The nine commercially important species of salmon occur in two genera. Atlantic salmon have been established in Patagonia, as well. Also a number of other species have common names which refer to them as being salmon. The British Columbia salmon fossil provides evidence that the divergence between Pacific and Atlantic salmon had not yet occurred 40 million years ago. Both the fossil record and analysis of mitochondrial DNA suggest the divergence occurred by 10 to 20 million years ago. This independent evidence from DNA analysis and the fossil record rejects the glacial theory of salmon divergence.
They are not a different species from the Atlantic salmon, but have independently evolved a non-migratory life cycle, which they maintain even when they could access the ocean. United States as king salmon or blackmouth salmon, and as spring salmon in British Columbia. It is also now known to occur, albeit infrequently, in the Mackenzie River. Pacific Ocean in Japan, Korea, and Russia.
Taiwan’s Chi Chia Wan Stream. Canada to the Lena River in Siberia, usually in shorter coastal streams. It is the smallest of the Pacific species, with an average weight of 1. Kokanee salmon are the land-locked form of sockeye salmon. Salmon eggs are laid in freshwater streams typically at high latitudes. The fry quickly develop into parr with camouflaging vertical stripes.
The smolt body chemistry changes, allowing them to live in salt water. The parr lose their camouflage bars and become smolt as they become ready for the transition to the ocean. The adult salmon then return primarily to their natal streams to spawn. Atlantic salmon spend between one and four years at sea.