catching any triploids ?

visited a N.C. state hatchery last week and was surprised to find they are
now raising triploid brook trout for stocking purposes. see
http://northwesttrout.com/Newsitems/triploid.htm
http://www.eou/~mmustoe?Fishing.html
My questions
although they cannot bred do the triploids know this? will they swim
upstream in the fall and confuse the small native specks who are trying to
raise babies?

as the trips are much bigger do we have to put a * beside their weight when
describing the brook trout we catch?

do we have to carry a dna kit onto stream to know if we have caught a native
Appalachian brookie, a New England strain brookie or a trip fish ?

Next morning walked up my brookie stream and caught just one 7
incher ]native]--rest were hunkered down from the cold-
Joe the Elder

On Dec 18, 2:51 pm, "Joe McIntosh" wrote:
visited a N.C. state hatchery last week and was surprised to find they are
now raising triploid brook trout for stocking purposes. seehttp://northwesttrout.com/Newsitems/triploid.htmhttp://www.eou/~mmustoe?Fishing.html
My questions
although they cannot bred do the triploids know this? w
Joe the Elder

Triploids are sterile, but they go through the motions. This also has
a number of side effects. One is the high fatality rate of egg-bound
"females" which are unable to shed the eggs or re-absorb them, and
there are many instances of fish producing spawn and eggs
simultaneously. This is not viable but of course affects the fish
considerably. In most of Europe, any stocking done with "foreign" fish
( rainbows) must now be done with triploids.

Although it is not widely publicised, the stocking of any such fish is
widely considered by fishery managers and others, to be extremely
detrimental to native stocks in a number of ways. Competition for food
and habitat being only two of these. There are a number of others.

There is no way to tell an acclimatised triploid from any naturally
grown fish, without extensive testing. Usually, the best indication is
the size of the fish. If it is a lot larger than the average for that
river, water, watershed, then it is most likely a triploid.

Most triploids are reared to a certain size ( on fish meal) before
being released. This also affects their behaviour considerably.

TL
MC