Mobulas are threatened by a long list of problems, but one of the most widespread is fisheries bycatch, or unintentional capture in fishing nets. In tropical tuna purse seines — the large circular fishing nets that catch 60% of the global tuna catch — Mobula bycatch is of concern. Approximately 13,000 Mobula rays are captured in global tuna purse-seine fisheries each year. In the Eastern Tropical Pacific purse seine fishery in particular, where observers record 100% of tuna fishing sets, about one in every six sets contains a Mobula ray. This bycatch threatens Mobula populations. It also presents an enormous conservation opportunity. If we can mitigate Mobula bycatch in tuna fisheries.