The marine environment of the state of Kuwait has observed a massive fish kill mainly in mullets (Liza macrolepis) from 17 September 1999.Five days latter, water coloration was observed in Al-Beda‚a coast south of Kuwait Bay. The bloom was due to the dinoflagellate Gymnodinium spp; other species detected in the bloom including Prorocentrum micans, Dinophysis caudata and Gyrodinium spirel. In the 4th October the bloom was spread in Kuwait Bay. This time was associated with another fish kill, particularly in the cages of aquaculture sea bream (Sparidentex hasta), it was estimated that 100 tons of fish were killed .The bloom species was Gymnodinium c.f. mikimotoi. Four stations were established at various patches, they were samples for plankton analysis, water quality and chemical analysis. The bloom was mainly attributed to Gymnodinium c.f. mikimotoi, with cell counts ranged from 2678000 to 7627000 cells/l. The G. mikimotoi bloom was succeeding by the bloom of photosynthetic ciliate Mesodinium rubrum. The main objective of this report is to share Kuwait experience of dealing with the first harmful algal blooms in its territorial water and finding the environmental conditions .In addition to assistant and support Environment Public Authority (EPA) received from the national, regional and international communities.