Scientists in Brazil said it came after authorities made an effort to clean up the water of the natural harbor that shapes the identity of the region.
Research has linked fibropapillomatosis, a benign tumor in sea turtles, to both a virus and environmental factors.
Kassia Coelho, a professor of veterinary pathological anatomy at the Federal Fluminense University, said samples taken from the animals and the water pointed to a much healthier environment.
“It’s about analyzing health by collecting blood and tumors from these turtles, and also biometrics of the animals, seeing their growth over the years and monitoring these animals from one year to the next,” she said.
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“Many of these turtles are recaptured and we can assess whether they’ve grown, whether they’re heavier, whether they’ve lost weight, whether they have more tumors or fewer tumors.”
Surrounded by a dense urban population, Guanabara Bay was once a nursery for marine life but has over the years suffered from sewage and other garbage being dumped there.
In 2022, scientists found that three quarters of sea turtles there were carrying the tumors.
While research is still ongoing, Gustavo Baila, an oceanographer and professor at the Federal University of Rio Grande, said sea turtles have been healthier since 2023.
“These are very important species for marine conservation,” he said. “We had observed a high incidence of sea turtles with tumors, with deformities that ended up being very serious for the development of these animals.”
Brazil is home to five of the seven species of sea turtles that exist worldwide. However, their natural habitat is sometimes severely impacted by humans. Conservationists have called for stricter measures to protect these animals.
Alexandre Bianchini, a vice president at Brazilian water and sewage treatment company Aegea, said some 2 billion reais ($356.42 million) had been invested into cleaning up the water in the area. “Now, nature responds,” he said.
