Variance of shell-boring polychaete infestation of farmed abalone, Haliotis discus hannai at Wando waters, Korea
Jin Do Kim, Jin Seo Park, Byung-Hak Kim, Kyoung-Mi Won and Deok-Chan Lee
Aquaculture management Division, South Sea Fisheries Research Institute, NIFS, Yeosu 59780, Korea Fish Pathology Division, NIFS, Busan 46083, Korea
It is known that severe infestation of polychaetes with abalone shells can cause mortality and affect productivity. In order to obtain accurate data on polychaete infestations, we surveyed the infection rate of polychaetes in the abalone, Haliotis discus hannai cage farms located in Wando area. The survey included changes in infestation rates for three years, monthly and seasonal changes in infestation rates and infestation rates in the spawning field. The range of infestation rate of polychaetes against abalone for 3 years was 23.8-52.8%. In general, infestation rate increased rapidly around high temperature (around August) and peaked in autumn. The mean infestation rate of the polychaetes of the onshore farms producing abalone was 5.4%. Therefore, the rate of polydorides infestation in abalone farms in Wando-gun increased during the period of rising water temperature, and it is considered that the infestations that occur during the production of young shell may be affected.
  
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