Resumen del producto

The monitoring of paralytic shellfish poisoning (PSP) in Mazatlan, Sinaloa consisted of determining and comparing the toxicity and profile of PSP in Striostrea prismatica (commercial species) and Chama sordida (non-commercial species) collected from 2003 to 2015. The PSP analysis was performed by applying a high-performance liquid chromatography with fluorescence detector (HPLC-FD) using the official method AOAC (2005.06) and Lawrence et al. (2005). The method showed high sensitivity to STX, GTX2,3, GTX5, C1,2, dcSTX, dcGTX2,3 and low sensitivity to GTX1,4 and NEO derivatives. The maximum concentrations of PSP during monitoring were 13,156.24 µg STX eq kg-1 to S. prismatica and 28,000 µg STX eq kg-1 to C. sordida. It was determined that C. sordida has high levels of PSP in 70.7% of the data collected. It has been found that C. sordida exceeds 2.5 times the level of PSP compared to S. prismatica. There was an increase of PSP in both species from March to May each year. Such seasonality is related to the presence of the toxic dinoflagellate G. catenatum; it the largest producer of PSP in the bay. On eight different occasions, (Mar 2003, Apr 2003, May 2003, Nov 2003, Mar 2010, Mar 2011, Mar 2013, Apr 2013), PSP levels exceeded the regulatory action limit set by the Mexican government (800 µg STX eq kg-1). Under natural conditions, it was determined that no significant differences (p<0.05) exist in the average concentration of STX, GTX2,3, GTX5 and dcSTX derivatives between S. prismatica and C. sordida, however, significant differences (p<0.05) were observed in the concentrations of C1,2 between the two species. C. sordida had a significantly higher concentration of C1, 2. This paper presents evidence of the most vulnerable period’s toxicity in shellfish (March and April). This data will prove invaluable to proposing measures for the handling and management of marine sanitation in this area. Furthermore, our research confirms that monitoring shellfish for PSP in areas with chronic toxic events is an essential tool to prevent health risks to the local and national population which may inadvertently consume contaminated shellfish.

Palabras clave: Monitoring; toxicity; Harmful algae blooms

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