Perkinsus sp. of Japanese Scallops in Asia


Category 1 (Not Reported in Canada)

Common, generally accepted names of the organism or disease agent

Perkinsus disease of Japanese scallops.

Scientific name or taxonomic affiliation

Perkinsus sp.

Geographic distribution

In scallops imported into the east coast of Russia from Aomori Prefecture, Japan.

Host species

Patinopecten (=Mizuhopecten) yessoensis.

Impact on the host

Reported in 86% of the young scallops within the same month (December 1979) that the scallops were imported into the inlets of Popov Island, Russia from Japan. The parasites were confined to 1-2 spherical cysts in various organs and tissues of each scallop. Pathological effects on the scallops were not mentioned.

Diagnostic techniques

Wet Mounts: Spherical cysts (0.2-0.3 mm in diameter) containing meronts (trophozoites) and prezoosporangia are morphologically similar to those described for Perkinsus olseni in the abalone Haliotis ruber. Mature sporangia have long tubes (up to 1.5 times the diameter of a sporangium) through which numerous motile flagellated zoospores are released.

Methods of control

No known method of prevention or control.


Kurochkin, Y.V., E.M. Tsimbalyuk and A.V. Rybakov. 1986. Parazitî i bolyezni. (Parasites and diseases.) In: P.A. Motavkin (ed.). Primorskii grebeshok. (The Yezo scallop or Japanese common scallop Mizuhopecten yessoensis (Jay).) Institute of Marine Biology, Far East Science Centre, Academy of the USSR, Vladivostok, p. 174­182. (In Russian).

Citation Information

Bower, S.M., McGladdery, S.E., Price, I.M. (1994): Synopsis of Infectious Diseases and Parasites of Commercially Exploited Shellfish: Perkinsus sp. of Japanese Scallops in Asia.

Date last revised: Fall 1994
Comments to Susan Bower

Date modified: