A vast bloom of toxic algae is killing more than 200 species of marine life off the southern coast of Australia, scientists and conservation groups say.

The algae -- Karenia mikimotoi -- appeared in waters around South Australia state in March, causing mass deaths in species including sharks, rays, crabs and octopuses.

"There are carcasses littering beaches," said Brad Martin, a manager of the non-profit fish conservation group Ozfish.

"It is common for our volunteers to say: 'We walked for one kilometre along the beach and saw 100 dead rays and other marine........

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