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 kilometers with patches of oil.
The administrations of both former US president George W. Bush and US President Barack Obama tried to win greater international protection for the bluefin, but their efforts were derailed by opposition from countries like Japan, where a single large bluefin can sell in the sashimi market for hundreds of thousands of dollars. (The tuna fish sold in cans comes from more abundant types of tuna, not from bluefin.)
The bluefin uses the Gulf of Mexico as a prime spawning ground, and the Gulf is such a critical habitat for the animal that fishing for it there was banned in the 1980s. But after spawning in the spring and summer, many tuna spend the rest of the year roaming the Atlantic, where they are hunted by a global fishing fleet.
The environmental advocacy group, the Center for Biological Diversity, in Tucson, Arizona, filed the request under the Endangered Species Act late last month. If the petition is granted, a process that could take years, the endangered listing would require federal agencies to conduct exhaustive analysis before taking any action, like granting drilling permits that would pose additional risk to the fish.
Beyond tuna, other animals at apparent risk of harm include the whale shark, the largest fish in the ocean, and a group known as billfish, the foundation of a large recreational fishery in the Gulf of Mexico and the western Atlantic. The billfish that could be affected include the the sailfish, as well as blue marlin and swordfish.
“This is a much bigger problem than people are making out,” said Barbara Block, a Stanford researcher who is among the world’s leading experts on the bluefin tuna. “The concern for wildlife is not just along the coast; it is also at sea. We’re putting oil right into the bluewater environment.”
Some of the science documenting the risks that oil drilling poses to spawning fish was paid for by none other than the Minerals Management Service, the federal agency responsible for leasing offshore tracts for oil development.
Yet the results appear to have had little impact on the way the agency carried out its business. For instance, it never adopted seasonal limitations on drilling in the Gulf that might have reduced the risk of oil spills during spawning season. It also dismissed the dangers that drilling posed to deepwater fish as “negligible.”
Obama has acknowledged the agency’s failings. Its director, S. Elizabeth Birnbaum, resigned, and a reorganization of the agency’s functions is under way (last week, it was renamed the Bureau of Ocean Energy Management, Regulation and Enforcement).
The agency responded to inquiries by saying that in light of the Deepwater Horizon spill, its policies — including those for fisheries — were under review.
Given that a single female fish can produce tens of millions of eggs, scientists say that many billions of them would have been in the water on April 20. The vast majority of those would never survive to adulthood even in normal times; now bathed in oil, fewer will make it.
Many important fish in the region, like yellowfin tuna, are able to spawn across broad areas of the Gulf, and that means significant numbers of such fish should have hatched this year far from the oil spill.
But other species, including bluefin tuna, apparently have a strong instinct to spawn in a specific part of the ocean. Scientists fear that instinct might overcome the presence of oil in the water, causing the fish to spawn in areas where their offspring would be likely to die. One of the spawning areas in the Gulf favored by bluefin is in the vicinity of the spill, Block said.
The risks the spill poses to fish of all kinds has provoked deep alarm among commercial and sport fishing groups. At least a half-dozen major billfishing tournaments have been canceled, and tourists who would normally take deep-sea fishing trips this time of year are avoiding the Gulf. The American Sportfishing Association estimated that business owners were losing millions of dollars in a recreational fishing industry worth more than US$3.5 billion a year in the Gulf.
“It’s having a horrific impact on the marine and fishing industry,” said Dan Jacobs, tournament director for an offshore fishing championship. “The big question is, how long is it going to last?”
The oil spill appears to be setting the stage for a new fight over the future of the bluefin tuna.
“The tuna are in a critical stage,” Block said. “They have declined as much as 80 percent since 1950 in the Gulf of Mexico.”
Besides its petition under the Endangered Species Act, the Center for Biological Diversity said it would file petitions with two government agencies under a federal fisheries law, seeking greater protections for fish when the government considers leases and permits for oil drilling.
Given that it takes some big fish years to reach spawning age, the death of larvae and juvenile fish could have consequences that might not show up for a long time.
“The oil spill could be the last straw with these very vulnerable species,” said Ellen Peel, president of the Billfish Foundation, a nonprofit group that supports recreational offshore fishing.
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