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<p>The prevalence and effects of <i>Gyge ovalis</i> (Shiino, 1939) infestation on its host, <i>Upogebia major</i> (De Haan, 1841), were monitored monthly between 2012 and 2015 at two tidal flats in Seonjaedo and Jugyo on the west coast of Korea, eastern Yellow Sea. <i>Gyge ovalis</i> was the predominant parasite on mud shrimp, accounting for over 90% of macroparasite occurrences at both sites. The mean prevalence was 5.0% in Seonjaedo and 29.1% in Jugyo. Monthly prevalence declined over the study period but peaked in summer due to a reduced catch of uninfested mud shrimp. Ovigerous <i>G. ovalis</i> were present from April to September. Infestation of newly settled mud shrimp, together with the infrequent occurrence of small <i>G. ovalis</i> on large hosts, is consistent with predominant establishment during host recruitment and limited later establishment. The size-specific prevalence did not differ significantly between males and females.&#xa0;Estimated apparent annual mortality was 6.2 and 11.5 percentage points higher in infested mud shrimp at Seonjaedo and Jugyo, respectively.&#xa0;Infested mud shrimp were 7.3–14.2% smaller in size, with older cohorts showing larger relative differences. In particular, infested mud shrimp rarely reached the minimum carapace length required for reproduction (25&#xa0;mm). Size-adjusted weight loss in infested mud shrimp was 14.8% in Seonjaedo and 8.5% in Jugyo, with no difference between sexes. None of the infested females were ovigerous, suggesting female castration by <i>G. ovalis</i>. In the context of its lifespan, the observed persistence of <i>G. ovalis</i> broadly aligned with the duration of the host cohort, with both rarely detected&#xa0;5–6&#xa0;years after host recruitment.</p>

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Prevalence and impact of bopyrid isopod infestation on mud shrimp populations in the eastern Yellow Sea

  • 期刊论文

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  • 发表日期：

    2026年8月1日

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  • Sungtae Kim,
  • Chae-Lin Lee,
  • Chul Yu,
  • Taewon Kim,
  • Jae-Sang Hong

摘要

The prevalence and effects of Gyge ovalis (Shiino, 1939) infestation on its host, Upogebia major (De Haan, 1841), were monitored monthly between 2012 and 2015 at two tidal flats in Seonjaedo and Jugyo on the west coast of Korea, eastern Yellow Sea. Gyge ovalis was the predominant parasite on mud shrimp, accounting for over 90% of macroparasite occurrences at both sites. The mean prevalence was 5.0% in Seonjaedo and 29.1% in Jugyo. Monthly prevalence declined over the study period but peaked in summer due to a reduced catch of uninfested mud shrimp. Ovigerous G. ovalis were present from April to September. Infestation of newly settled mud shrimp, together with the infrequent occurrence of small G. ovalis on large hosts, is consistent with predominant establishment during host recruitment and limited later establishment. The size-specific prevalence did not differ significantly between males and females. Estimated apparent annual mortality was 6.2 and 11.5 percentage points higher in infested mud shrimp at Seonjaedo and Jugyo, respectively. Infested mud shrimp were 7.3–14.2% smaller in size, with older cohorts showing larger relative differences. In particular, infested mud shrimp rarely reached the minimum carapace length required for reproduction (25 mm). Size-adjusted weight loss in infested mud shrimp was 14.8% in Seonjaedo and 8.5% in Jugyo, with no difference between sexes. None of the infested females were ovigerous, suggesting female castration by G. ovalis. In the context of its lifespan, the observed persistence of G. ovalis broadly aligned with the duration of the host cohort, with both rarely detected 5–6 years after host recruitment.