Second Record of Argulus matuii (Branchiura: Argulidae) from Mariculture in Japan: Infection on a Juvenile Japanese Amberjack Seriola quinqueradiata Cultured in Kochi Prefecture

Abstract

One argulid specimen was collected from the caudal fin of a juvenile Japanese amberjack Seriola quinqueradiata cultured in coastal Pacific waters off Sukumo, Kochi Prefecture, western Japan. The specimen was identified as Argulus matuii based on morphological characters such as six streaks of yellow fringed with dark brown pigments on the dorsal surface of the carapace and foot-shaped natatory lobes on the fourth pair of legs. This species was previously reported from bastard halibut Paralichthys olivaceus farmed in Japan. Thus, the present collection of A. matuii represents its second record in the Japanese mariculture.