Marine Mammals Information Database :Illustrated Guide of Marine Mammals

Risso's dolphin

Scientific Name : Grampus griseus / Japanese Name : hana-gondou


Order Cetacea
Suborder Odontoceti
Family Delphinidae
Genus Grampus
Species griseus
Subspecies -
Subtype -
CITES Appendix II IUCN RedData Status Least Concern
Baleen plates or tooth-Upper jaw - Baleen plates or tooth-Lower jaw 3-8
At birth At weaning Adult Adult male Adult female
Body length - - 10-13ft - -
Body weight - - 300-600kg - -
Feature and Habit
Their body is massive at the anterior portion and taper toward the tail stock. The head is rounded and have indistinct rostrum. They have the characteristic longitudinal depression on the melon. The dorsal fin is high, falcated, and locates in the middle of the body length. The flippers are long and pointed. Their body is light to dark gray with heavy scars. As they grow up, their bodies become white. The flippers, the flukes, the dorsal fin are darker. They have no teeth in the upper jaw and 3-8 teeth in each side of the lower jaw. They inhabit in offshore waters. They are single or in pods of several dolphins and sometime in large pod.
Stranding Record(s) in Japan

Marine Mammals Skull Database

A click on the skull thumb nail will bring you to detailed images.

Sex F Reproductive Condition -
Body length 195 Locality Kii-Katsuura, Wakayama Pre.
Museum No. - Other No. -

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