In recent years, the pufferfish Lagocephalus lagocephalus has been recorded with unusual frequency in coastal areas of the Canary Islands. The most notable episodes occurred in March and November 2017, when numerous shoals were observed along the coasts of the Western Canary Islands. A toxicological study of these episodes was carried out, analyzing liver, kidney, gonads, skin, and muscle of a representative population. In all toxic samples (33.3% and 41.7% of specimens in March and November 2017, respectively), only the liver extract showed toxicities, using a mouse biological assay (MBA). The toxicological profile was determined by UHPLC-MS-MS, identifying saxitoxin (STX) and tetrodotoxin (TTX) congeners. This analytical methodology was optimized to determine 26 marine toxins. Thus, in the March 2017 episode, the toxicological profile was characterized by the co-occurrence of tetrodotoxins (TTX and 4-epiTTX) and paralytic shellfish toxin (PST) analogues (dcSTX, dcneoSTX, and doSTX); however, STX and neoSTX emerged as the dominant toxins in specimens collected during the November 2017 episode. The results show that L. lagocephalus in the Canary Islands presents a variable and dynamic toxicological profile, strongly influenced by environmental factors. These findings highlight the need for continued monitoring and for analytical approaches capable of capturing this complexity and assessing potential risks to public health.
Nocchi et al. (Mon,) studied this question.