Abstract
Two Risso's Dolphins (Grampus griseus; Cetacea: Delphinidae) were recorded in
the Sagami Bay in the first half of 2018. The first individual was a young male, with a body
length of 2550 mm, stranded on the Katase Nishihama Coast of Fujisawa City on January
28, 2018. The second individual was a male calf with a body length of 1840 mm, found
drifting along the Tsujido Higashi Kaigan Coast of Fujisawa City on June 2, 2018. There
have been 54 reports of this species from the coasts of Sagami Bay and Tokyo Bay, recorded
over 60 years between 1958 and 2018. This study reports on the sighting of the two stray
individuals in 2018, as well as presents an overview of the observational records from the
past 60 years.
