Effect of harmful phytoplankton on the survival of the abalones, Haliotis discus and Sulculus diversicolor
1998
Matsuyama, Y. (Nansei National Fisheries Research Inst., Ono, Hiroshima (Japan)) | Koizumi, Y. | Uchida, T.
During harmful algal blooms (red tide) on the coast of Japan, massive mortalities of marine animals including commercially important gastropods have resulted in economic losses of wild resources and local aquaculture. In order to evaluate the detrimental effect of the algal blooms, the effects of three phytoflagellates, Heterocapsa circularisquama, Gymnodinium mikimotoi, and Heterosigma akashiwo on survival of juvenile abalone, Haliotis discus and Sulculus diversicolor were studied in the laboratory. The results demonstrate that H. circularisquama and G. mikimotoi frequently kill both abalone species within 24 hours at densities 10(4) cells/ml accompanied with unusual avoidance behaviors; vigorous contraction of tentacles, escape locomotion, and paralysis of the animals. The raphidophyte species H. akashiwo showed lower detrimental effects compared with the two dinoflagellates
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