One of the biggest such species washed ashore recently was that of a 250 kg 'sea pig'. Besides, carcasses of dolphins and whales are also found at regular intervals at the park, South East Asia's first marine biosphere reserve.
Officials said a recent survey carried out by the park had revealed that use of explosives and banned nets to snare fish and discharge of effluents from factories near shore have led to the death of marine species.
Besides poachers were also playing havoc and so it was decided to install better monitoring systems to prevent sea poaching.
The marine park will also monitor effluent discharge, including quantity of oil leak and chemicals, the officials said, adding, they hoped better monitoring would help bring down poaching and control the pollution.
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The Gulf of Mannar Marine National Park has a core area of about 560 sq km from Rameswaram to Tutucorin on the south-east coast of India.
The Biosphere reserve comprises 21 islands with estuaries, mudflats, beaches, forests of the near shore environment, including marine components like algal communities, sea grasses, coral reefs, salt marshes and mangroves.