The effects of Prorocentrum donghaiense, Karenia mikimotoi, Alexandrium catenella, the causative species of Harmful Algal Blooms in the East China Sea, on the survival and growth of Neomysis awatschensis and Artemia salina were investigated. And the toxicity of eleven strains of Alexandrium——A. lusitanicum(AL-1)、A. minutum(AM-1)、A. spp.(A-K)、A. tamarense(ATHK,ATCI02, ATCI03, AT5-1, AT5-3,AT-6)、A. affine(AS-1,AC-1) to the two above organisms were compared.The results showed that P. donghaiense and K. mikimotoi had no adverse effect on the survival and growth of N. awatschensis and A. salina at 96h.However, the survival rate of N. awatschensis and A. salina declined linearly with the increasing density of A. catenella, and the 96h LC50 for N. awatschensis and A. salina was 4500 and 460cells/mL, respectively.Five strains of Alexandrium——A. spp, A. lusitanicum(AL-1), A. tamarense(AT5-3, AT-6)and A.affine(AS-1)at the density of 4000cells/mL and 96h had no adverse impacts on N.awatschensis.But other six strains of Alexandrium——A.tamarense(AT5-1, ATHK, ATCI02, ATCI03), A.affine(AC-1)and A.minutum(AM-1)decreased the survival rate of N.awatschensis significantly. Two strains of Alexandrium——A. lusitanicum(AL-1)and A.tamarense(AT-6), at the density of 500cells/mL had no adverse effects on A.salina in 96h; while the other Alexandrium strains all had adverse effects on the survival of A.salina.A.salina could increase its length with the increasing density of P.donghaiense, K.mikimotoi and A.lusitanicum. The results indicate that P.donghaiense and K.mikimotoi have no significant effect on the survival of crustacean zooplankton in a short period.But several Alexandrium species/strains could influence the survival of crustacean zooplankton likely by non-PSP substances.A.salina is shown to be more sensitive than N.awatschensis as test organisms to harmful species.
