The harmful algal blooms(HABs) are occurring in more locations than ever before and have caused serious destruction to the coastal marine environment and massive mortality of cultured organisms.Various mitigating methods,such as physical or chemical ones,have been proposed,but the results are not desirable because of their unpredictable impacts on marine ecosystem.Biological strategies are thus suggested for its potential HABs mitigating ability with little side effects.Macroalga is popular in aquatic ecosy...