The bycatch rates might suprise you. Mid water trawling is a fraction of 1%, like .001% when targeting pollok ( fish sticks, imitation crab, surimi ). Samlon trollers have near zero bycatch as do salmon purse seiners. Salmon Gill netters have a minimal amount but do get a few birds, not many buy a few. Bottom gill netters, what the original question dealt with, have a substantial bycatch, but nothing like bottom trawlers. They are being banned everywhere as they should be. The one trip I went on to help a buddy we shovled about 30 tons of bycatch over for the 8 tons of keepers we got. NFMS is responsable for the rules that required overages of the DTS complex to be dumped when some of the species target levels had been reached. I threw tens of thousands of dollars worth of black cod ( butter fish) over becouse the boat had hit the monthly limit but was allowed to continue to catch the low dollar thornyheads and dovers. Keep em or stop fishing! Feds make the rules, blame them. BAN ALL BOTTOM TRAWLING!... I fished pots (traps) and long line mostly. Both for the most part fairly clean fisheries with very limited bycatch.
What to eat? Albacore tuna has little bycatch and it's good for you. Red salmon are not farmed and are plankton eaters so little bioacumulation of heavy metals, ect and they are the best eating. Pinks also have littel bio problems andf are overly abundunt. Could'nt get 4 cents a pound for them this year in AK, too many fish! Ya don't hear about this do ya? Kings and silvers aka coho are troll, gillnet and seine netted, hard to tell which was what for the untrained eye but it's all good. Cod fish are abundant, fast growing and tasty. Taken by pots, LL gear, trawl, all prety clean. Mostly seen as fish n chips. Nokaoi!
I stay up on most of these fisheries world wide so if you have any questions, I can give you a somewhat educated answer.....NO FARMED FISH OF ANY KIND!!!!!
Sory about the typos, this took a while and a few glasses of vino
PS, spearfishing has zero bycatch! ( for MM)