ISSN : 1225-3480
Laboratory exposure tests are helpful for specific clues between harmful algae and marine animals, but have a subject to be answered. That is if the cultured strains are as potent as the wild ones in nature. We tested damage potentials of cultured and wild strains of Cochlodinium polykrikoides to two aquaculture species, abalones Haliotis discus hannai and black scrapers Thamnaconus modestus at 26℃ for 24 hours in culture chamber (80 L) carrying each strain (50 L each) at around 2,000 cells mL-1 and two references, alga-free seawater and Tetraselmis suecica at 10 × 104 cells mL-1. The toxicities were species-specific. They were harmless to the abalone as were two controls. But both were acute to the fish with bigger potential of cultured one. In cultured strain, the fish reached mortality 40% at hour 0.25 and then total mortality at hour 2. The wild one was also damageable but less than cultured one with first and total mortalities at hour 2. All the findings were significant at least at P < 0.05. In the theory of allelochemical dynamics, dinoflagellate toxicity becomes more potent in nutritionally unfavorable waters. In our study, a conspicuous difference between the two strains was length of majority chain, 2-4 cells for cultured one and 8-16 cells for wild one. The shorter chain of cultured strain was reminiscent of the algal growth in less favorable nutrition and of higher production of allelochemicals, and thus might make it more toxic. Our estimation might be worth interpretation in exposure test of harmful dinoflagellates to marine animals.
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