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For what it's worth:
The Pacific salmon runs are at about 1% of what they were when they were first documented in 1914. That says to me that the wild stocks are in serious trouble, and must be given time to recover. So I refuse to eat Pacific wild salmon.
Pacific farm salmon tends to be fed a processed mixture of feeder fish, fish waste and corn. Salmon aren't supposed to eat corn, and it takes a lot of energy to go out and catch fish to feed to fish, so that puts the energy debt pretty high. In terms of environmental damage, it's the energy debt (Pac farm salmon provide about 1 calorie for every 25 it takes to get them to the plate) rather than the waste that's the big deal. The waste is bad, but it's "organic" waste, in that it biodegrades quickly and doesn't cause significant damage to the local ecosystem.
Then there's Atlantic salmon. The North Sea used to be highly toxic, but the EU, the ECC and the nations in the area have done a brilliant job cleaning it up, and the major polluters (off-shore oil rigs) have become really, really clean because spilled oil can't be sold. (Duh!) So while Atlantic salmon used to be pretty scary stuff, young Antlantic salmon are pretty clean, and because the waters are colder, have a higher Omega-3 concentration.
They're farming salmon off the Norway and Irish coasts right now, and the wild stocks are in pretty good shape now, but wild fish tend to be older fish, and so have had more time to bioaccumulate heavy metals and PCBs, while farmed fish are younger and their water is more carefully monitored for pollutants. So Atlantic farmed salmon usually has a lower heavy metal and PCB load, and European farmed Atlantic salmon isn't fed corn. However, all salmon has a fairly high energy debt because they're carnivores rather than omnivores or herbivores.
When we eat salmon, primarily smoked salmon, we get a Norwegian imported farmed Atlantic salmon. But we for the reasons above, we don't eat much salmon -- it just has too much of a debt load.
Tilapia, farm trout, catfish and almost all shellfish are farmed. They're also very low on the food chain. We don't eat a lot of wild-caught fish period because there are very few species that can sustain the level of fishing that is currently going on, and I don't want to contribute to that. (Atlantic Cod, Orange Roughy, Chilean Sea Bass and several shark species are in serious, endangered species type trouble because of overfishing.)
And we live in the mountains, about as far from an ocean as it's possible to get. It's kind of irresponsible to be macking down seafood that has to be flown in, frozen, and maintained frozen for long periods of time.
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