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In article ,
writes:

The pen and net salmon are Atlantic salmon. Pacific salmon are
anadromous

I had to look this word up......seems to mean "Ascending rivers from
the sea, at certain seasons, for breeding, as the salmon, shad, etc."

As far as I know that is true of both Atlantic and Pacific salmon.

Sort of. Atlantic salmon are not reliable about it. Their habits are
more like a Pacific Coast steelhead trout. They only swim upriver to
spawn, and they only spawn when they feel like it. They also don't
reliably return to the spot where they were hatched. Sometimes they
don't bother to return at all, or won't return for years, or return
dozens of times.

Pacific salmon are a true anadromous fish with a life cycle that begins
and ends at their hatching grounds. There is no need to pen them. If
they survive they will swim right back into the hatching pond they came
from. That is what has made them such a popular farm fish in temperate
and cold waters everywhere in the world. They are harvested by the
millions in the southern hemisphere, from Argentina to New Zealand, and
in Asia as far south as Korea and Japan.

--
http://home.teleport.com/~larryc