Wow, considering you say you have been a fisherman so long, I'm beginning to think you're just lying. By-catch isn't an obstacle to profit, never has been. They can just toss the fish they don't want overboard, but so many species are profitable to catch that this rarely happens. What actually happens is that other boats come along and buy it. By-catch is only a problem because the gov't gets in your way. Try not to go in circles ya senile old man. If fishermen made an effort to reduce by-catch before the gov't came along, gov't wouldn't be interfering.
As the scientific studies prove, the exclusion trawling nets are ineffective. Just because you end your idiotic posts with comments about how you're an expert and I'm not clearly isn't winning you the debate. What's happening here is that you've finally come across someone who knows what's up and doesn't fall for the corporate propaganda that keeps you in business poaching endangered species.
The only reason you never caught any dolphin, unless you were lying, is that there are no more tuna near Oregon, at least not nearly enough to justify tuna boats. You see, fishermen used to follow the dolphins in order to find the skipjack and yellowtail schools. When corralling them into nets, of course dolphins also were caught and it was just too costly to save them. This went on right up until the yellowtail and skipjacks were gone, even though the canneries placated Greenpeace by swearing they were dolphin safe.
MSC sells the BS and it's the fisherman's word against the activist, until scientists started proving that populations were dwindling. Now it's a new product and different species being caught in the nets by accident while tuna is farmed.