migrating up rivers from the sea to spawn.

The stream in which a fish was born, where it returns to spawn.

a newly spawned salmon or trout still carrying the yolk.

the salmon recently hatched from spawn.

a young salmon (or trout) after the parr stage, when it becomes silvery and migrates to the sea for the first time.

a spawning nest made by the female salmon.

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Science 9 salmon voc

Term	Definition
anadromous	migrating up rivers from the sea to spawn.
spawn	release or deposit eggs.
natal stream	The stream in which a fish was born, where it returns to spawn.
alevin	a newly spawned salmon or trout still carrying the yolk.
fry	the salmon recently hatched from spawn.
smolt	a young salmon (or trout) after the parr stage, when it becomes silvery and migrates to the sea for the first time.
milt	the semen of a male fish.
A.T.U	acquired thermal unit
redd	a spawning nest made by the female salmon.