Harmful algal blooms(HABs) of the coastal raphidophyte Heterosigma akashiwo havebeen the focus of many studies,primarily due to the devastating effects this alga has had on the aquaculture industry.Heterosigma akashiwo is notorious for ichthyotoxicity and widely distributed in the world.Heterosigma akashiwo has caused great economic loss in many countries.Allelopathy is a prevalent natural phenomenon in aquatic ecosystems and also a means of biological control of water weeds.This paper studies the allelopat...