Abstract
Occurrences of basking shark, Cetorhinus maximus (Gunnerus, 1765) (Lamniformes: Cetorhinidae) in Sagami Bay were reviewed. There are three certain records of this species in the bay: an individual fished off Enoshima in March 21, 1961, a female of about 4 m in total length fished off Sajima in June 8, 2005, and a male of 4.74 m in total length fished off Chojagasaki in April 26, 2009. These fishes were captured with a set-net, and immature in all
cases. When we analyzed sea conditions of April 24 to 27, it was suggested that occurrence of Chojagasaki's specimen is no relation to the Oyashio Current. We presumed that this species strayed accidentally into the bay because of extremely low frequency of occurrence.
