Devotees bathe in the water of Ganga ahead of Chhath Puja festival at Gandhi Ghat in Patna, Bihar, India on November 17, 2020.(Photo by Santosh Kumar/ Hindustan Times)
Devotees bathe in the water of Ganga ahead of Chhath Puja festival at Gandhi Ghat in Patna, Bihar, India on November 17, 2020.(Photo by Santosh Kumar/ Hindustan Times)

Plastic pollution from fishing nets threatening wildlife in Ganga, study finds

In the study, published in the journal Science of The Total Environment, surveys along the length of the river, from the mouth in Bangladesh to the Himalayas in India, show levels of waste fishing gear are highest near to the sea.
By Press Trust of India | Posted by Mallika Soni | Lucknow
PUBLISHED ON NOV 30, 2020 12:38 PM IST

Plastic pollution from discarded fishing gear in the Ganga River poses a threat to wildlife such as the critically endangered three-striped roofed turtle and the endangered Ganga river dolphin, according to an international team including researchers from the Wildlife Institute of India.

In the study, published in the journal Science of The Total Environment, surveys along the length of the river, from the mouth in Bangladesh to the Himalayas in India, show levels of waste fishing gear are highest near to the sea.

The researchers noted that fishing nets -- all made of plastic -- were the most common type of gear found.

Interviews with local fishers showed high rates of fishing equipment being discarded in the river -- driven by short gear lifespans and lack of appropriate disposal systems, they said.

“The Ganges River supports some of the world’s largest inland fisheries, but no research has been done to assess plastic pollution from this industry, and its impacts on wildlife,” said Sarah Nelms from the University of Exeter in the UK.

“Ingesting plastic can harm wildlife, but our threat assessment focussed on entanglement, which is known to injure and kill a wide range of marine species,” Nelms said.

The researchers used a list of 21 river species of “conservation concern” identified by the Wildlife Institute of India in Uttarakhand.

They combined existing information on entanglements of similar species worldwide with the new data on levels of waste fishing gear in the Ganges to estimate which species are most at risk.

“There is no system for fishers to recycle their nets. Most fishers told us they mend and repurpose nets if they can, but if they can’t do that the nets are often discarded in the river,” said Nelms.

“Many held the view that the river ‘cleans it away’, so one useful step would be to raise awareness of the real environmental impacts,” she said.

The findings offer hope for solutions based on “circular economy” where waste is dramatically reduced by reusing materials, according to Professor Heather Koldewey, from the Zoological Society of London(ZSL).

“A high proportion of the fishing gear we found was made of nylon 6, which is valuable and can be used to make products including carpets and clothing,” Koldeway said.

“Collection and recycling of nylon 6 has strong potential as a solution because it would cut plastic pollution and provide an income,” she added.

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