Unfortunately the FDA is considering approving Genetically Modified Salmon. They're almost there, and if they approve it we could see GM salmon on supermarket shelves in 3 years. In many countries of the world (including the US and Canada), GM products are not required to be labelled, so the GM fish will stealth their way onto your table without you knowing. But there are significant dangers associated with GM technologies.
For example, the herbicide used on most GM crops (typically rice, soy and corn), RoundUp, causes birth defects if mothers are exposed to it during pregnancy, and the 'safe' levels are often found to be exceeded 10 times over. And that's just one well-documented example. GM life has been linked to cancer and other life-threatening diseases. But that's just the risks to you.
GM crops have never significantly improved yield (as promised), have not reduced the use of chemicals (as promised), have enslaved farmers economically and dramatically increased farmer suicide rates, have given rise to superweeds that are immune to common/safe herbicides, and have spread into the wild to pollute and damage natural habitats.
GM producers have narrow vision. They have repeatedly proven that profit is their God, and they will stop at nothing (including intimidation and even murder) to make money. They encourage mono-cropping (decreasing biodiversity and increasing habitat fragility) and deforestation, and their 'recommended' farming practices lead to desertification. They are destroying the fertility of the soils, and so are reducing the worlds' potential agricultural yields.
GM animals and fish will fall down in all the same areas. They are bad for humanity, bad for the planet, bad for life, bad for everything. Unfortunately the FDA is run/controlled by pro-GM lobbyists. They have no concern for the environment or human health. If GM salmon is allowed, we all get one step sicker.
The FDA don't even have a suitable process to determining the GM salmon's safety. They are using the animal drug safety procedure to approve this fish - now doesn't that make you feel safe!
One final warning: The approval of GM salmon will open the flood gates for more GM animals. We are witnessing the destruction of agriculture itself, and with it, the possibility of sustainable food production on this planet.
