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Catadromous – fish that migrate from fresh water down (Greek: κατά kata, "down" and δρόμος dromos, "course") into the sea to spawn, such as eels [6] [8] George S. Myers coined the following terms in a 1949 journal article: Diadromous – all fish that migrate between the sea and fresh water.
A grizzly bear ambushing a jumping salmon during an annual salmon run. A salmon run is an annual fish migration event where many salmonid species, which are typically hatched in fresh water and live most of their adult life downstream in the ocean, swim back against the stream to the upper reaches of rivers to spawn on the gravel beds of small creeks.
Because the eels are catadromous (living in fresh water but spawning in the sea), dams and other river obstructions can block their ability to reach inland feeding grounds. Since the 1970s, an increasing number of eel ladders have been constructed in North America and Europe to help the fish bypass obstructions.
Leptobarbus hoevenii or "sultan fish" migrate the fresh water rivers of Malaysia and travel at the surface in schools of 40-80 individuals at speeds of 0.48-1.08 km. [3] Acid-soluble collagen (ASC) and pepsin-soluble collagen (PSC) were extracted from the muscles of selected cultured catfish (hybrid of Clarias gariepinus x Clarias macrocephalus ...
Steelhead in 1924 illustration using the original taxonomic name, Salmo gairdneri The freshwater form of the steelhead is the rainbow trout (Oncorhynchus mykiss).The difference between these forms of the species is that steelhead migrate to the ocean and return to freshwater tributaries to spawn, whereas non-anadromous rainbow trout do not leave freshwater.
Salmon are typically anadromous: they hatch in the shallow gravel beds of freshwater headstreams and spend their juvenile years in rivers, lakes and freshwater wetlands, migrate to the ocean as adults and live like sea fish, then return to their freshwater birthplace to reproduce. However, populations of several species are restricted to fresh ...
Burbot, Lota lota The burbot (Lota lota), also known as bubbot, [2] mariah, [3] loche, cusk, [4] freshwater cod, [5] freshwater ling, freshwater cusk, the lawyer, coney-fish, lingcod, [6] or eelpout, is a species of coldwater ray-finned fish native to the subarctic regions of the Northern hemisphere.
The mass mortality after spawning that is common in some species of salmon is not usual for brown trout. Once back in the sea, the fish regain their weight and lose their brown spawning colouring. The surviving young of sea trout will generally migrate back to the sea, to feed in estuaries and coastal waters.
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