ABSTRACT: Stable fish provision from fish farms is more important than ever under limitation of fish catch and heavy dependence on the fish for protein by people in the Southeast Asia. Aiming at providing basic information which could contribute to developing research to mitigate damages by fish kills caused by Harmful Algal Blooms (HABs), this study investigated reports of red tides with fish kills in the Southeast Asia and discusses its trends. Literature review and information gathering through joining at a regional training on HABs clarified that at least fifty red tides with fish kills occurred from 1976 to March, 2016. A trend was identified that more detailed reports describing economic loss and amount of the fish killed have increased in line with development of aquaculture in the region. The fifty red tide cases are composed of thirty five by dinoflagellates, six by cyanobacteria, two by raphidophyte, one by haptophyte, two by diatoms, one by ciliate, and five unknown. Thirteen were identified as causative genera of HABs with fish kills.
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