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Caribbean ciguatera: a changing paradigm.

T R Tosteson1

  • 1Department of Marine Sciences, University of Puerto Rico-Mayaguez, Isla Magueyes Marine Station, P.O. Box 908 Lajas. cigua@aol.com

Revista De Biologia Tropical
|May 1, 2007
PubMed
Summary
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A 1985-1988 model for barracuda ciguatoxicity is outdated. Recent data show increased fish toxicity, loss of seasonality, and multiple toxins, linked to rising sea temperatures.

Area of Science:

  • Marine Biology
  • Ecotoxicology
  • Fisheries Science

Background:

  • Ciguatera fish poisoning is a significant public health concern in tropical and subtropical regions.
  • A predictive model for ciguatoxicity in great barracuda (Sphyraena barracuda) was developed using data from 1985-1988 in Puerto Rico.
  • This model aimed to correlate fish toxicity with benthic dinoflagellate abundance and human intoxication cases.

Purpose of the Study:

  • To re-evaluate the validity of the 1985-1988 ciguatoxicity model using contemporary data from 1990-2000.
  • To investigate changes in barracuda ciguatoxicity patterns and their potential environmental drivers.
  • To assess the impact of changing environmental conditions, specifically sea surface temperatures, on fish toxicity.

Main Methods:

Related Experiment Videos

  • Analysis of ciguatoxicity in great barracuda samples collected between 1990-2000.
  • Comparison of toxicity data with historical data from 1985-1988.
  • Correlation analysis between fish toxicity, seasonality, toxin profiles, and sea surface temperature records.

    • Main Results:

    • The proposed 1985-1988 model's predictive validity was questioned by the new dataset.
    • Barracuda ciguatoxicity lost its prominent seasonality during the 1990-2000 period.
    • A significant increase in the proportion of ciguatoxic barracuda was observed, with individuals often containing multiple toxins, correlating with rising sea surface temperatures.

    Conclusions:

    • Environmental changes, particularly elevated sea surface temperatures, are altering ciguatoxicity dynamics in great barracuda.
    • The observed changes necessitate a revision of existing models for predicting ciguatera fish poisoning risk.
    • Understanding these shifts is crucial for public health advisories and fisheries management in affected regions.