Hundreds of fish are found dead on a farm in the seas off Geoje city on the south coast of South Korea because of red tide, a type of algal bloom that produces natural toxins and depletes dissolved oxygen, killing fish. The dead fish were reported four days after the National Fisheries Research and Development Institute issued a red tide warning for the coast around Geoje and Goheung-gun in South Jeolla province, according to a report by The Korea Herald.