Our Latest News

New lease of life for original lighthouse vents

15/05/2018

As part of the ongoing conservation of the Cape Bruny and Maatsuyker Island lighthouses, a team effort has been underway to restore the original bronze vents from the lighthouses' lantern rooms.More

Record visitor numbers at Highfield Historic Site

09/05/2018

Visitation numbers at Highfield Historic Site in Stanley have reached a record high, with 12,535 people visiting in the 12 months ending March 2018.More

Cradle Mountain shuttle bus tender awarded

08/05/2018

A new bus fleet featuring environmentally friendly technology and vehicles with improved accessibility and increased capacity will help to meet increasing visitor numbers following the awarding of the tender to McDermott Coaches.More

Rissos Dolphin

Drawing by Graham Sanders
Risso’s Dolphins are robust dolphins with a blunt head, lacking a distinct beak. The forehead has a distinctive deep crease. The mouthline slopes upward and contain about seven pairs of teeth. The flippers are long, pointed and recurved and the dorsal fin is tall and sickle-shaped. Newborns are light grey and adults are a very light grey to white with a narrow cape on some individuals. The ventrum is dark with a large white anchor shaped grey patch. They often heavily scarred. Both sexes reach up to 230kg in weight. They are very gregarious swimming in groups of 25 up to several hundred and often swim in a line formation although single animals can be found swimming alone at times.

General Information

Risso’s Dolphins are abundant in tropical and temperate waters. They are still hunted off Japan. They generally occur in waters deeper than 1km . They are regularly seen with other cetaceans particularly pilot whales and they have been known to interbreed with Bottlenosed Dolphins. Calving is generally in summer although a newborn was recorded from Victoria in winter. Birth weight is around 60kg and 1.5m. Weaning occurs around 2m in length and maturity at about 3m length. They breed at two or three yearly intervals. They feed mainly on squid.

Stranding Information

Risso’s Dolphins have been recorded as stranding from all Australian States including one from Tasmania. All Australian records of strandings are single individuals although mass strandings have occurred in other parts of the world.