Rare dolphin species threatened by big fishnets

Jan 18, 2013
A fisherman throws his fishing net in Nicaragua on November 20, 2012. The long-beaked La Plata River dolphin, a small species living in in South America's Atlantic coastal waters, is increasingly threatened with extinction from big-net fishing, Brazilian researchers warn.

The long-beaked La Plata River dolphin, a small species living in in South America's Atlantic coastal waters, is increasingly threatened with extinction from big-net fishing, Brazilian researchers warn.

At last 1,000 of these die every year near the coast of (Brazil's) Rio Grande do Sul," scientist Emanuel Carvalho Ferreira told AFP Friday.

Ferreira led a study funded by cosmetic giant Boticario's Foundation for Nature Protection on the mortality of these marine mammals which "showed that fishnets have become increasingly bigger over the past few years and now can be 30 kilometers (19 miles) long."

"This is a virtually insurmountable barrier for these small dolphins," said Ferreira, who works with Rio Grande do Sul's marine mammals laboratory and with the KAOSA non-governmental organization campaigning for the protection of the La Plata River dolphin.

There are currently an estimated 40,000 to 50,000 of these river dolphins, which grow to be between four and six feet long (1.20 to 1.80 meter) and weigh up to 50 kilograms (110 pounds).

It is the only species of river dolphins that can be found in salt water.

Although their sightings are scarce, they can be found in Brazil's Doce River, the Valdes Peninsula in Argentina and in the of Uruguay.

Undated handout picture of dead La Plata dolphins. The long-beaked La Plata River dolphin, a small species living in in South America's Atlantic coastal waters, is increasingly threatened with extinction from big-net fishing, Brazilian researchers warn.

But they are most threatened in Brazilian waters because fishing in Uruguay and Argentina is conducted in a less intensive manner.

"In Brazil, the boats are bigger with 20 fishermen (against four or five in Uruguay and Argentina) who stay at sea for up to 20 days, which leads to the accidental capture of many cetaceans," said Ferreira.

To remedy the situation, he said his team recommends reducing the size of fishnets and banning fishing up to a depth of 20 meters (66 feet).

"We did a simulation by excluding fishing up to a depth of 20 meters and the accidental capture and dolphin fell by 72 percent," he added.

Ferreira said new rules had been set to reduce the size of fishnets to 15 kilometers.

"We will then gradually reduce them further. We also launched a campaign of awareness among the fishermen," he added.

Explore further: Man 'expelled from Croatia for punching monk seal'

add to favorites email to friend print save as pdf

Related Stories

Bangladesh to set up dolphin sanctuaries

Oct 31, 2011

Bangladesh will declare three river areas in its southwest as dolphin sanctuaries, wildlife officials said Monday, in a bid to protect the country's population of endangered freshwater cetaceans.

18 endangered dolphins spotted off Borneo: WWF

Feb 07, 2012

Conservation group WWF said it spotted 18 critically endangered Irrawaddy dolphins in Indonesian waters off Borneo island Tuesday and called for greater protection of the species' habitat.

WWF calls for action to save Mekong dolphins

Aug 17, 2011

Conservation group WWF on Wednesday called for urgent action to prevent the extinction of freshwater dolphins in the Mekong River, including the creation of special conservation zones.

Recommended for you

Brother of Hibiscus is found alive and well on Maui

11 hours ago

Most people are familiar with Hibiscus flowers- they are an iconic symbol of tropical resorts worldwide where they are commonly planted in the landscape. Some, like Hawaii's State Flower- Hibiscus brackenridgei- are en ...

Boat noise impacts development and survival of sea hares

13 hours ago

While previous studies have shown that marine noise can affect animal movement and communication, with unknown ecological consequences, scientists from the Universities of Bristol and Exeter and the École Pratique des Hautes ...

Classic Lewis Carroll character inspires new ecological model

Jul 30, 2014

Inspired by the Red Queen in Lewis Carroll's Through the Looking Glass, collaborators from the University of Illinois and National University of Singapore improved a 35-year-old ecology model to better understand how species ...

Saving seeds the right way can save the world's plants

Jul 30, 2014

Exotic pests, shrinking ranges and a changing climate threaten some of the world's most rare and ecologically important plants, and so conservationists establish seed collections to save the seeds in banks ...

User comments : 0