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Seasonality of the Infection of Acanthochondria brevicorpa (Copepoda) on a Gobiid fish Acanthogobius hasta off the south coast of Korea (한국 남해안의 풀망둑에 기생하는 요각류 Acanthochondria brevicorpa 감염률의 계절성)

  • SUH, HAE-LIP
    • 한국해양학회지
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    • v.29 no.1
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    • pp.1-4
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    • 1994

  • The fish host, Acanthogobius hasta, was sampled monthly (April 1990 to March 1991) from Wando Islands, Korea, and examined for the parasitic Copepod Acanthochondria brevicorpa. Prevalence was positively correlated with fish length; parasitic copepods were only found in fishes > 24 cm TL. distinct seasonal variation in prevalence and intensity of A. brevicorpa infection was observed, although no data were available in April, June and July 1990 when no A. hasta was caught. Averaged over all samples, of the 83 fishes caught, 34.9% were infected with a mean intensity of 3 copepods per host No A. brevicorpa was found on the host between August and October. Ovigerous females of the Copepod were found between February and May, with an abundance peak in May. Young copepodids (Ci to CIII) of A. brevicorpa were not present throughout the year, but only late copepodids of CIV and CV were found on the fish in March and May. Results from the present study suggest that A. brevicorpa mainly produces larvae in spring, and may have a life cycle including additional hosts.

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A Harpacticoid Copepod Parasitic in the Cultivated Brown Alga Undaria pinnatifida in Korea

  • PARK Tai-Soo;RHO Yong-Gil;GONG Yong-Gun;LEE Dong-Yeub
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.23 no.6
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    • pp.439-442
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    • 1990

  • We have examined harpacticoid copepods inhabiting the phaeophyte Miyok, Undaria pinnatifida (Harvey), on the southern coast of Korea and cultured in the laboratory pieces of Miyok frond heavily infested by frond-mining nauplii to identify the harpacticoid copepod to which those nauplii belong. Of the harpacticoids found in Miyok-washings, only Amenophia orientalis Ho and Hong and an unidentified species of the genus Scutellidium occurred consistently in all Miyok samples examined. Many females of both species carried egg sacs. In the cultures the frond-mining nauplii developed, in 15 days at$15^{\circ}C$, into cope-podid stages or adults that were all identified with Amenephia orientalis. It is therefore concluded that this species is the causative agent for the so-called pinhole disease of the cultivated Miyok on the southern coast of Korea, which is diagnosed by the appearance on the thallus of numerous pinholes occupied by developing nauplii.

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