Officers from the Department of Primary Industries, Parks, Water and Environment's Marine Conservation Program found a deceased sei whale dead on arrival.

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"Sei whales migrate past Tasmania's East Coast each year but it is rare to see them deceased on the beach," a department spokesperson said.

"Wildlife biologists will conduct a necropsy to try to determine a cause of death but it appears the whale may have had a long-term underlying issue.

"It is not yet been determined if it is male or female.

"Necropsy on a pygmy whale found dead at a separate beach at Bridport last week did not reveal any obvious cause of death."

Sightings or strandings can be reported to the Whale Hotline (0427 WHALES).