A fisherman has spotted a 3.5-4 metre shark in the Beechford area, the species of shark was not reported.
Tasmania Police issued a community alert on Wednesday morning, after receiving reports of the sighting, warning people to consider entering the water in the Beechford area.
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It was reportedly spotted about five to 10 kilometres off shore, near Tenth Island.
The time of the sighting has not been reported.
The alert comes after Lucas Arnott, 10, was attacked by a great white about five kilometres off the coast of Stanley on July 17.
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