Living in fresh water but migrating to marine waters to breed. Used of fish.
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Living in fresh water but migrating to marine waters to breed. Used of fish.
The adjective has one meaning:
Meaning #1:
migrating from fresh water to the sea to spawn
Antonyms: diadromous (meaning #1), anadromous (meaning #1)
Many types of fish undertake migrations on a regular basis, on time scales ranging from daily to annual, and with distances ranging from a few meters to thousands of kilometers. The purpose usually relates to either feeding or breeding; in some cases the reason for migration is still unknown.
Migratory fish are classified according to the following scheme:
1. diadromous fish travel between salt and fresh water. (Greek: 'Dia' is between) There are three types of diadromous fish:
2. potamodromous fish migrate within fresh water only. (Greek: 'Potamos' is river)
3. oceanodromous fish migrate within salt water only. (Greek: 'Oceanos' is ocean)
The best-known anadromous fish are salmon, which hatch in small freshwater streams, go down to the sea and live there for several years, then return to the same streams where they were hatched, spawn, and die shortly thereafter. 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 fish are sea trout, three-spined stickleback, and shad.
The most remarkable catadromous fish are freshwater eels of genus Anguilla, whose larvae drift on the open ocean, sometimes for months or years, before travelling thousands of kilometres back to their original streams (see eel reproduction).
Diel vertical migration is a common behavior; many marine species move to the surface at night to feed, then return to the depths during daytime.
A number of large marine fishes, such as the tuna, migrate north and south annually, following temperature variations in the ocean. These are of great importance to fisheries.
Freshwater fish migrations are usually shorter, typically from lake to stream or vice versa, for spawning purposes.
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![]() | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved. Read more | |
![]() | Obscure Words. © 2008 by Michael A. Fischer http://home.comcast.net/~wwftd. Read more | |
![]() | WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. Read more | |
![]() | Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Fish migration". Read more |
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