a·nad·ro·mous

[uh-nad-ruh-muhs]
adjective
(of fish) migrating from salt water to spawn in fresh water, as salmon of the genera Salmo and Oncorhynchus ( distinguished from catadromous ).

Origin:
1745–55; < Greek anádromos running upward. See ana-, -drome, -ous

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Collins
World English Dictionary
anadromous (əˈnædrəməs) [Click for IPA pronunciation guide]
 
adj
Compare catadromous (of fishes such as the salmon) migrating up rivers from the sea in order to breed
 
[C18: from Greek anadromos running upwards, from ana- + dromos a running]

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00:10
Anadromous is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Etymonline
Word Origin & History

anadromous
of fish ascending a river to spawn (as salmon do), 1753, from Gk. anadromos "running upward," from ana "up, back" + dramein "to run" (see dromedary).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
anadromous   (ə-nād'rə-məs)  Pronunciation Key 
Relating to fish, such as salmon or shad, that migrate up rivers from the sea to breed in fresh water.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Protect waterfowl nesting and molting areas, anadromous streams, and
  prehistoric heritage sites.
Both species are anadromous and undertake upriver spawning migrations during
  spring.
Big dams stop anadromous fish, the best-known of which are salmon, returning to
  their spawning-grounds to breed.
Construction activities also must be coordinated with critical spawning periods
  of anadromous fish.
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