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[Ciguatera: neurophysiological demonstration of toxicity of several ciquatoxic fractions].

Raw extracts from one Polynesian, frequently ciguatera-inducing fish were submitted to fractional distillation by means of a chromatographic process using a silicic acid column. Three out of the seven fractions split this way exhibited either anticholinesterasic properties, or directly toxic properties at the muscle-cell level: fraction 5, which is not antagonized by atropine, presumably accounts for this direct action, as it competes with calcium at membrane sites. Fraction 6 appears to be more specially responsible for the anticholinesterasic action. It revealed a quaternary ammonium ion in its 6-2 sub-fraction. Fraction 7 shows the same properties as fraction 6, but on a smaller scale.

Action Potentials↗
PubMed1992

Bursts of ciguatera and endo-upwelling process on coral reef.

We propose a significant relationship between bursts of ciguatera following disturbance on a reef area and seepages of endo-upwelled interstitial waters, rich in nutrients. Such waters cannot continue to be used by a stressed or eliminated algal-coral ecosystem and are taken up by epibenthic planktons i.e. Gambierdiscus toxicus, of which population increases sharply.

Ciguatera Poisoning↗
PubMed1992

Toxicity of French Polynesian strains of Gambierdiscus toxicus in cultures.

Seven clonal strains of Gambierdiscus toxicus isolated from three ciguateric areas around Tahiti island were mass cultured and extracted for ciguatoxins and maitotoxin. CTX analogs were detected only in one clone (GTP1), suggesting that CTX production may be strain-dependent. However, this in vitro production of CTXs, which remains fairly poor with regards to the toxicity levels encountered in wild G. toxicus, is not a stable temporal characteristic. On the other hand, maitotoxic compounds were detected in all 7 strains in copious amount, especially in clone GTH2.

Animals↗