We should be fixing farmed fish. When was the last time people ate wild cow. It's not sustainable for a population to be exploiting wild fish, farm properly and learn to do it quickly. As long as we eat meat, we have to do it in the least intrusive way.
Since cow are definitionally domesticated, nobody has ever eaten a wild cow, but people eat wild mammals on a regular basis. Game is typically much healthier as a food source than domesticated animals; this includes wild-caught fish vs. farm-raised fish.
How many species of fish will go extinct before we figure this out. Fish used to be very common(look at the stories of the colonists coming to North America). Also, people are still eating bluefin tuna, it's endangered.