The sharp increase in the number of dolphins killed this year in the Brazilian state of Rio de Janeiro further aggravated the situation of this cetacean species, and species considered threatened.
In the first ten months of this year were found in Sepetiba Bay, about 80 kilometers west of Rio de Janeiro, 54 dead specimens of this species from the dolphin family known in Brazil as boto-cinza (Gray Dolphin ) that inhabits the Amazon basin and different estuaries along the South American Atlantic coast.
The Sepetiba Bay is the place that has the largest colony of these animals in Brazil, For the biologist Luiza Beirão, researcher at the Boto-Cinza Institute and has been studying its evolution, “the figure this year is very worrying is precisely because the average annual mortality recorded since 2005 was about 20 specimens. ”
In just a decade, said the biologist, “from 2,000 to just 1,000 the number of tucuxis (Gray Dolphin ), from the Sepetiba Bay has been reduced by half,” . In enumerating the causes of the dramatic decline in the population of these small cetaceans to Beirão it lacks fingers.
Ensure, however, that the determinant factors that have been placed on the list of animals threatened with extinction are pollution, industrial fishing and little official control.
“Wastewater from large population centers are dumped in the bay because the homes lack basic sanitation. Add up to that discharges from large industries, urban pressure preying huge areas of mangroves and fishing vessels, even from other states, using illegal networks for sardines, the main food of dolphins, which often die entangled.
And all led of the meager supervision of the authorities, ” she complained. This species, whose scientific name is Sotalia guianensis, also known as tucuxi and pirajaguara in other countries.
Source | EFE