<P> Highly migratory species can be compared with straddling stock and transboundary stock . Straddling stock range both within an EEZ as well as in the high seas . Transboundary stock range in the EEZs of at least two countries . A stock can be both transboundary and straddling . </P> <P> Some of the best - known anadromous fishes are the Pacific salmon species, such as Chinook (king), coho (silver), chum (dog), pink (humpback) and sockeye (red) salmon . These salmon hatch in small freshwater streams . From there they migrate to the sea to mature, living there for two to six years . When mature, the salmon return to the same streams where they were hatched to spawn . Salmon are capable of going hundreds of kilometers upriver, and humans must install fish ladders in dams to enable the salmon to get past . Other examples of anadromous fishes are sea trout, three - spined stickleback, sea lamprey and shad . </P> <P> Several Pacific salmon (Chinook, coho and Steelhead) have been introduced into the US Great Lakes, and have become potamodromous, migrating between their natal waters to feeding grounds entirely within fresh water . </P> <P> The most remarkable catadromous fishes are freshwater eels of genus Anguilla, whose larvae drift from spawning grounds in the Sargasso sea, sometimes for months or years, before entering freshwater river and streams as glass eels or elvers (see eel life history). </P>

Which of these fish has one of the longest migration routes in water