Prevalence of black scraper Thamnaconus modestus with body surface abnormalities in Mitsu Bay, Hiroshima Prefecture

January 1, 2026NIPPON SUISAN GAKKAISHIOpen Access

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Key Points

This research aims to investigate the prevalence of body surface abnormalities in Thamnaconus modestus in Mitsu Bay.
Conducted an investigation from 2023 to 2025 of Thamnaconus modestus in Mitsu Bay.
Collected data from 102 individuals weighing between 235–800 g.
Analyzed the occurrence of body surface abnormalities throughout the year.
Observed a high prevalence rate of 80.4% for body surface abnormalities.
Abnormalities manifested as black granular foreign bodies, particularly clustered around the mouth and tail.
No significant correlation was found between the prevalence of abnormalities and fish sex or obesity.

Survey identifies high prevalence of body surface abnormalities in Thamnaconus modestus, indicating health concerns.

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ARATANI et al. (2026) studied this question.

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