Fishing capacity is the amount of fish or fishing effort that can be produced over a period of time (i.e. one year or a full fishing season) by a vessel or a fleet if fully utilized. Proper capacity management seems like a simple enough concept: have fewer boats on the water so that pressure on tuna stocks relents to a more ideal level. If you could only explain it in one sentence, that might just be the best way to do it; however, like all issues associated to managing fisheries, we don’t have the luxury of simplicity, which is why I’m glad I have the opportunity to say more than a sentence about how we, as conservationists and scientists, can continue to move the needle to limit fishing capacity across all tuna fisheries to more sustainable planes.