To make sure that the tuna population can be sustained in the long term the fisherman should only catch young, non-reproducing fish and prevent overfishing.
One of the most important causes of reductions in maritime wildlife populations is fishing. Except for overfishing, which occurs when fishing boats take more fish than the ocean can sustain, taking fish is not intrinsically detrimental for the ocean. Bycatch, the capture of undesirable marine life when fishing for a different species, and overfishing are strongly related. Along with hundreds of thousands of sea turtles and cetaceans, this is another severe marine hazard that results in the unnecessary death of billions of fish. Overfishing hurts more than just the marine ecosystem. Fish is a major source of nourishment for billions of people worldwide, and for millions of individuals, fishing is their main source of income.
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