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Fish-kill dinoflagellates in Korean coastal waters – A comparative ecosystem approach Changkyu Lee Fishery and Ocean Information Division, National Fisheries Research Institute, Gijang-eup, Busan, R Korea. E-mail: [email protected] HAB (Harmful algal blooms) caused by flagellates have had severe impacts on fisheries along the Korean coastline since the 1980s. In particular, HAB caused by the fish-kill flagellate, Cochlodinium polykrikoides, have become annual and persistent occurrences since the mid 1990s. There is clear evidence of contrasting occurrences and impacts of fish-kill flagellates in Korean coasts. Data describing these fish-killing flagellates provide a unique opportunity for east-west Pacific comparisons to identify and rank those environmental factors that promote harmful algal bloom success at different times. Here, I focus on the fish-killing species, Cochlodinium polykrikoides, Heterosigma akashiwo and Chattonella that historically have caused fisheries damage in the eastern and/or western Pacific. I present the available dataset on these 3 genera from the 1990s to the present on the following parameters: HAB species presence, maximum abundance, toxicity, optimal conditions for growth, time of year, temperature range, salinity range, stratification, nutrients, wind, river flow, upwelling indices, and a suite of other environmental parameters associated with these problems. Together with other workshop participants, I will evaluate the trends and patterns in these data to develop hypotheses for the initiation, development, and abatement of these HABs.
