1)Eat fishes that are at the lower part of the food chain.
Fishes that are at the lower part of the food chain will then to have a larger population. If we consume fishes that have a larger population, our actions will not affect them so much. However, this does not mean we should not eat fish that are at the higher end of the food chain. This only means we should treat them like a luxury item and eat them in moderation.
2)Fish farming
With the presence of fish farming, we can consume fish without affecting the marine life in any way. If you have the money, you can invest in a small plot in a fish farm to breed ish. This not only gives you a good supply of fish, but it also opens up a business oppotunity for you.
3)Safe fishing
It is known that dolphins tend to get caught up in fishing nets, and when they are unable to escape, they will drown. Practicing safe fishing will ensure that our meal is caught but the dolphins stay alive.