Investigations into nine great white shark deaths this year have revealed at least three are likely to have been killed by the toxic algal bloom.

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Government scientists have been conducting necropsies on some of the wildlife that have died since the bloom was first detected in South Australian waters.

Results released by the Department for Environment and Water show that of the nine sharks that died between April and July, three had "physical symptoms, including gill damage, consistent with a cause of death related to exposure to high levels of karenia spp".

In each of the three, the report stated that the cause of death could not be concluded, and while "low concentrations" of brevetoxin were identified, it was

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