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Lipophilic toxins were investigated in different benthic compartments of Paranaguá Bay, southern Brazil. Relatively low concentrations of okadaic acid (OA) were frequently reported in macrophyte extracts (maximum 0.64 ng g −1 ), mainly in sheltered estuarine areas, correlated with the cell abundance of toxigenic benthic dinoflagellates,  Prorocentrum lima . Non-conjugated OA was also detected in benthic marine animals, mostly during summer-autumn 2016. Higher OA concentrations were found in the viscera of  Genidens genidens  fish (24.3 ± 3.7 ng g −1 ) and in soft tissues of  Mytella guyanensis  bivalves (21.3 ± 2.13 ng g −1 ), whereas lower levels were less frequently reported in many other benthic feeders, including cephalopods, gastropods, crustaceans and fishes. Although OA concentrations were below the levels associated with acute human intoxication, possible chronic effects to benthic animals and their consumers cannot be disregarded due to the frequent presence of this biotoxin in various fishery resources. Human health risks are substantially enhanced for small-scale fishing communities and other socioeconomically vulnerable populations.

Prevalence of okadaic acid in benthic organisms associated Prorocentrum lima complex in a sub-tropical estuary