The ichthyotoxicity and toxin composition of a red‐tide producing chloromonad Fibrocapsa japonica (Toriumi and Takano) were examined. The flagellate showed the highest toxicity in mid‐logarithmic phase and the lowest in the stationary phase with increased number of spherical‐shaped cells. Five neurotoxic components, FjTx‐I, FjTx‐II, FjTx‐IIIa, FjTx‐IIIb and FjTx‐IV, which corresponded to brevetoxin components, PbTx‐1, PbTx‐2, PbTx‐9, PbTx‐3 and oxidized PbTx‐2 were tentatively identified from analysis of F. japonica toxins on TLC and HPLC. The quantity of each component fluctuated with the age and growth stage of the culture. Among the five toxic components the yield of FjTx‐II per cell was highest in both logarithmic and stationary phases.
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Khan et al. (1996) studied this question.
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