The team of scientists have made great advances in fishing in coral reefs, this was not a decisive role in its collapse.
"Fishermen and scientists have been a long time, the amount of fish, pulled in front of a rockslide in mind, said Dr. Nick Graham, ARC Centre of Excellence (CoE ARC) for Coral Reef Studies, the James Cook University that.
"The consequences of overfishing can be difficult to recover the ecosystem and may be decades, but hundreds of millions of people depend on reefs for food and nutrition, so that the bans in many countries is a reality."
Proceedings of the National Academy of Sciences, show that these questions lead to create the relationship of the U.S. (PNAS), researchers, such as overfishing, a predictable series of events in the collapse of reef ecosystems.
His research has made available a new tool for management of coral reefs and tropical fisheries around the world, the problem is solved for you to help, I think the fish resources on the rock to maintain.
"Our work shows that the biomass of fish - live, the number and weight of fish in the reef - declines due to fishing pressure to return to the approval of a series of thresholds or tipping points from which is difficult, "Dr. Graham says ..
"No, you can restore the coral patches of weeds, sea urchins to eat more, you can see the coral, is a general decline of biodiversity in coral reefs and will be less.
'Tis the destruction of hard coral reefs in the past. Warning signs that even that many people had live coral cover, the last, seem to save the lost reef. "
The study shows that in conservation areas, a different type of reef fish of coral reefs of 1000-1500 kg per hectare.
If the volume is less than £ 1000, was the first warning signs, such as increased growth of algae and sea urchins working as his prisoner.
The researchers found that between 300-600 kg / ha, is the window that appeared to be in the maximum sustainable yield, but if the fish population drops below 300 kg / ha of rocks, if not the real problem.
Dr. Aaron MacNeil Australian Institute of Marine Science, adds: "This is an important source of information for policy makers and managers Riff: If people can get to a certain extent, it is much better chance of maintaining sustainable fisheries and healthy reefs system is.
"But the whole idea of how health is understood, and no divisions," he says. "Administrators of the species with the protection of fish and the reef, and is compatible with the long term you need to get to places like the Great Barrier Reef fish."
"Thanks for the pain and are always a pair of shoes," says Joshua, Cinna, and suffering from ARC Europe. "That's why we also have examined how different reef management systems in the defense of this, the rock or on the window.
The rock fishing regulations are not bad since collapsed. No marine reserves where fishing was banned were the best artists and tended to the important ecosystem processes such as predation of being.
"But people depend on reefs for food, so the fish can not be everywhere." Said Dr. Cinna. "One of the results of our study was that the application is easy to prune during the preparation or the types of species that can help grow the biomass. These rules are often taken by fishermen at the border, and accepted without further top of the support and service on it. "
The researchers say the work in the Red Sea coral reefs has been done, and was confirmed in a larger barrier reef - but like all books on the reef and fish health. Similar conditions are also the situation in other ecosystems.
His article "critical threshold and achievable goals for ecosystem management of fisheries on coral reefs" by Tim R. McClanahan, Nicholas AJ Graham, M. Aaron MacNeil, Nyawira A. Muthiga, Joshua E. Cinna, Henry J. Bruggemann K and Shaun. Wilson was presented this week in the online edition of Proceedings of the National Academy of Sciences published by the United States.
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