Comparison of diseases and immune parameters in the imported and domestic juvenile Manila clams, Ruditapes philippinarum during a 10 month cultivation on the west coast of Korea
Seung-Hyeon Kim, Hee-Do Jeung and Kyung-Il Park
Department of Aquatic Life Medicine, College of Ocean Science and Technology, Kunsan National University, Gunsan 54150, Republic of Korea Tidal Flat Research Center-National Institute of Fisheries Science, Gunsan, Jeonbuk 54001, Republic of Korea
Owing to limited production of juveniles, Manila clam (Ruditapes philippinarum) aquaculture in Korea has increasingly relied on imports of juvenile Manila clams from China. This study compared survival and physiological status of domestic and imported juvenile Manila clams. Domestic juvenile Manila clams were collected from Boryung, Chungnam Province, Korea, while imported juveniles were purchased from a trader who imported juvenile Manila clams. Clams of similar sizes were selected, and sown in clam cages installed in Gomso Bay, on the west coast of Korea. The mortality rate, growth, infection, reproductive cycle, and physiological response were monitored monthly from April 2015 to February 2016. Higher mortality and low immune parameters with higher pathogen infection rate were observed for imported clams compared to domestic clams during the experiment. It was hypothesized that the high mortality and low physiological status of imported clams might be caused by high levels of stress during the long period of transportation. High level pathogen infection in imported clams suggests that quarantine procedures should be consolidated to prevent the import of new diseases to the seas around Korea.
  
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