Wolfman,
Share your sources on the sterile thing, I haven't seen it explained fully yet in what I have read.
Closest I have come is some chatter talk like this .....
"The main problem most people have with GM salmon is the thought of environmental impact they could cause. These problems may include interbreeding to cause a “Trojan gene”, or the possibility of creating a pest fish such as Tilapia or Carp.” If transgenic salmon do breed successfully with native fish, their novel gene will escape into the wild gene pool and destroy native salmon populations, which is the so-called “Trojan Gene” theory.” (
http://www.primidi.com/2006/01/11.html)
However, these fish are 100% sterile, and therefore not able to reproduce. This is done by preventing the development of the ovaries needed to produce eggs. Make your choice."

Well, that may keep the bulk of the production momma fish out of the picture, but what happens when the unintended and very rare but
still gonna happen occasionally males spew their sperm all over standard salmon eggs?
You do realize that there are fertile females that produce eggs and healthy males that spew all over them somewhere in the background of this scheme don't you?
All they got to do is lose track of one male fish that survives the ocean and the trip up a creek somewhere and whammo -- free breeding first generation mixes with normal salmon.
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Do you think all of these puppies are sterile too?
"The pending decision is being tracked by biotechnology companies that have invested millions of dollars in developing genetically modified animals for food and are waiting for the FDA to act on their approval requests.
Scientists at the University of Guelph in Ontario, Canada, have asked the FDA to approve their "Enviropig," a hog genetically altered to produce environmentally friendly manure. Hematech of Sioux Falls, S.D., is developing genetically modified cows that are resistant to mad cow disease."