American oceanographer Sylvia Earle, named "Hero of the Planet" in 1998 by Time magazine and acknowledged for her documentaries by National Geographic, said in Costa Rica that marine resources are being lost as fast as they are found.

The power that humans have acquired over the past 50 years while discovering more about the oceans has had negative effects on the environment, the expert, who is making a documentary in Costa Rica, said in an interview con Efe.

"As man discovers more about the ocean, more is being lost," Earle said, adding that in the last 50 year some "90 percent" of tuna, turtles and sharks have disappeared worldwide.

The 78-year-old Earle, who has made more than 7,000 deep-sea dives and has led more than 100 expeditions, said that populations of marine species have shrunk because "we humans are very good at catching them."

"The oceans have never seen predators like humans," because "we believed there was an infinite number of those sea creatures," the oceanographer said.

Earle said that technology, greater access, the lack of protection and lack of education and interest is affecting the oceans.

Such matters motivated her to produce a documentary about the Central American Dome and its large concentration of undersea life, which the oceanographer has been shooting in the Pacific Ocean off Costa Rica since Jan. 20. EFE