Seasonal occurrence and habitats of two pennellid copepods (Siphonostomatoida) infecting ranched black scraper and rockfish in Korea

Abstract

The seasonal occurrence of two pennellids were studied for two years by collecting host fishes (5/month), black scraper Thamnaconus modestus and Korean rockfish Sebastes schlegelii ranched at Tongyeong marine living resources research & conservation center, KIOST from July 2011 to June 2013. The habitat of the infested copepods, its abundance, prevalence and mean intensity were recorded. Statistical calculations were carried out for the season and infestation. Peniculus minuticaudae from Thamnaconus modestus: Total-391, Prevalence-85%, mean intensity-3.25, maximum intensity-23. Season wise, the infestation was observed as highest in autumn, and lowest in winter. It was infested only on fins of black scrapers and they were severely damaged. Abundance of pennellids was found on the pectoral fin (170), followed by anal (88), second dorsal (80) and caudal fins (53). Two-way ANOVA analysis showed changes between season and infected regions are significant. P. minuticaudae was also found from the fins of wild threadsail filefish Stephanolepis cirrhifer from Tonyeong, Yeosu and Jeju fish markets. It can be a new record on it host and localities. Peniculus truncatus from Sebastes schlegelii: Total-45, Prevalence-37.5%, mean intensity-0.37, maximum intensity-6. Season wise, infestation was observed as highest in summer month, and lowest in winter. Attachment site was the dorsal fin (45) and not infesting any other fins of roservation center, KIOST from July 2011 to June 2013. The habitat of the infested copepods, its abundance, prevalence and mean intensity were recorded. Statistical calculations were carried out for the season and infestation. Peniculus minuticaudae from Thamnaconus modestus: Total-391, Prevalence-85%, mean intensity-3.25, maximum intensity-23. Season wise, the infestation was observed as highest in autumn, and lowest in winter. It was infested only on fins of black scrapers and they were severely damaged. Abundance of pennellids was found on the pectoral fin (170), followed by anal (88), second dorsal (80) and caudal fins (53). Two-way ANOVA analysis showed changes between season and infected regions are significant. P. minuticaudae was also found from the fins of wild threadsail filefish Stephanolepis cirrhifer from Tonyeong, Yeosu and Jeju fish markets. It can be a new record on it host and localities. Peniculus truncatus from Sebastes schlegelii: Total-45, Prevalence-37.5%, mean intensity-0.37, maximum intensity-6. Season wise, infestation was observed as highest in summer month, and lowest in winter. Attachment site was the dorsal fin (45) and not infesting any other fins of ro