Biggest Ever U.S. Fish Study Aids Florida Conservation

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During the census, scientists from the University of Miami and the NOAA sampled 200 species of fish in a 3,100 square mile patch of reef from Key Biscayne to Dry Tortugas National Park to form a snapshot of the entire ecosystem.

Using high-tech video equipment, a measuring stick, plastic paper and underwater pencils, they dived into the waters from a 100-foot boat and counted the fish one by one and checked lengths. Results of the 30-day census that ended in June will be used to evaluate the effectiveness of existing state and federal conservation policies and to help establish new guidelines, including the use of no-fishing zones—the most controversial tool in fishery management.

The Florida research also could be used as a model throughout the United States.

"It's the first time we've done a whole system assessment in one fell swoop," said University of Miami marine biologist Jerry Ault. "There is still a lot of discussion that things aren't bad enough to invoke any management. The long-term goal is to develop high-precision monitoring of stock abundance at particular life stages to see what effects regulations, like 'no-take zones' are having on coral reef fisheries resources throughout the Florida Keys."

In a controversial experiment to determine if untouched fish populations could thrive again, the federal government last year declared 151 square miles of waters in and around the Dry Tortugas off limits to all fishing. In 1997, the Florida Keys National Marine Sanctuary already had established 23 small "no-take" zones around popular, much smaller, coral reefs.

Other no-take zones are being considered, though recreational and commercial fishing groups have opposed them, claiming that most regulations are not enforced and that researchers have exaggerated the decline in fish and downplayed the impact of pollution and coastal development.

The no-take zone is particularly important to the future of Florida's coral reef, which drapes the coast for 130 miles from Key Biscayne to the Dry Tortugas. Worldwide, the ancient, slow-growing reefs have been imperiled by everything from global warming, to boat anchors and snorkelers to pollution.

Once classified as plants, coral reefs are animals that gather food instead of producing it themselves as most plants do. Along the Florida Keys, the Dry Tortugas plays an invaluable role in the marine ecosystem, harboring some 200 species of marine life that rely on it for food, shelter and protection. The reef also serves as a nesting ground for fish eggs and larvae that eventually populate the fish habitat throughout the coast.

"The Dry Tortugas is really the crown jewel of the reef system," said Steven Miller, director of the National Undersea Research Center at the University of North Carolina in Wilmington. "This is one of the few spectacular places that remain today where you can see coral that has survived. But coral reefs also are probably the first ecosystems to exhibit catastrophic response to global warming. And if we don't do something to protect them, they won't always be around," he said.

In the protected areas, researchers are already seeing signs of progress. Larger fish are more prevalent in those zones. The Goliath grouper that was nearing extinction a decade ago is making a comeback. The fish can grow to 800 pounds, but it takes decades for them to fully mature. The key to their survival is managing their environment, officials said.

"We haven't had a problem telling people they can't hunt for buffalo in Yellowstone National Park. But we've had a hard time telling them they can't fish for grouper in the Dry Tortugas," said John Hunt, research administrator for the Florida Marine Research Institute.

"Now we are saying you can look at them, but you can't catch them. In the long run, there will be an abundance of big fish available. But it's not easy to convince people it's in their best interest to wait."

Copyright 2002 Chicago Tribune

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