JR wrote:
Thomas Gnauck wrote:

I have always been told that the only difference between a Dolly and
a Bull
was that the Dolly was "sea run"
(similar to the rainbow/steelhead)
Are there actual detectable genetic differences?
I have never heard of the anal adipose alignment identification what
are the
other identifiers but it seems a very sketchy
way of calling a bull a bull and then implanting it?


Here's a concise layman's guide to a few phenotypic differences, with
short reference to studies on the genetic differences:

http://www.fishingwithrod.com/fishing_0601_04.html

They are not nearly as closely related as the great physical
resemblance
would lead you to believe.


I'm a bit concerned about the info on that site. The biologist I
talked to didn't think the anal ray count was diagnostic. I am sure
that the anadromous distinction doesn't hold. Both species are
comfortable in both fresh and salt water, and wander back and forth at
will.

From what I've read, you need to do a genetic analysis to be certain
which species youi have in your hand. These taxonomic differences
aren't entirely reliable.

Chas
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