sea lamprey

noun
a parasitic marine lamprey, Petromyzon marinus, that spawns in fresh water along both Atlantic coasts and in the Great Lakes, where it is responsible for losses of economically valuable fish.

Origin:
1875–80

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World English Dictionary
sea lamprey
 
n
a common anadromous lamprey, Petromyzon marinus, a form of which occurs in the Great Lakes of N America and causes great losses of fish

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
With its jawless toothy mouth adapted to suck the blood of fish, the sea lamprey is a ferocious parasite.
Conduct ecologically sound and publicly acceptable integrated sea lamprey management.
The mouth of parasitic sea lamprey contains many sharp teeth to help them attach to host fish.
There is no need to report sea lamprey or fish with sea lamprey wounds.
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