The population of the western Atlantic bluefin tuna has been steadily declining in the past 20 years. In fact, the most recent assessment published by the International Commission for the Conservation of Atlantic Tuna shows both that the population is at its lowest level ever, and that fishing pressure is at its highest point ever. A recent scientific study showed that bluefin tuna spawn in the Gulf of Mexico during the months of January through June, and that they were being killed as bycatch by the longliners targeting yellowfin tuna. Several conservation groups filed a petition in June of 2005 asking the National Marine Fisheries Service to close the bluefin spawning grounds in the Gulf of Mexico to all longline boats during spawning season. The agency refused to close the spawning grounds.
Earthjustice is challenging the decision, since the agency ignored important scientific data when formulating its rule.