Abstract: A 35-year record of algal blooms in Mazatlan Bay is reviewed in order to register bloom-forming species, their seasonal presence, duration, degree of toxicity and environmental impact. 202 algal blooms have been recorded and 25 dominant species identified: 6 toxic, 5 harmful and 14 harmless species. A harmless species, Myrionecta rubra, tended to decrease in frequency, while toxic species Gymnodinium catenatum and Cochlodinium polykrikoides show a clear trend towards an increase in frequency. The discoloration days attributable to blooms are hi...
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