Fearing that the oil spill in the Gulf of Mexico will deal a severe blow to the bluefin tuna, an environmental group is demanding that the government declare the fish an endangered species, setting off extensive new protections under federal law.

Scientists agree that the Deepwater Horizon spill poses at least some risk to the bluefin, one of the most majestic  and valuable  fishes in the sea. Its numbers already severely depleted from record levels, the bluefin is also the subject of a global controversy regarding overfishing.

The bluefin is not the only fish that spawns in the gulf, and while it is often a focus of attention, researchers are worried about the impact of the Deepwater Horizon oil spill on many other species.

In fact, scientists say, it is virtually certain that billions of fish eggs and larvae have died in the spill, which came at the worst possible time of the year. Spawning season for many fish in the gulf begins in April and runs into the summer. The drilling rig exploded on April 20, and the spill has since covered thousands of square miles with patches of oil.