BMAA C-CTX-1 Chinese yellow catfish Ciguatera fish poisoning Daphnia magna ELISA Gambierdiscus LC-HRMS LC-MS/MS Microcystis N2a NMR spectroscopy PPIA Rastrineobola argentea ShK-like peptide acute toxicity adaptation algal-bacterial relationship animal toxins beta-methyl-amino-l-alanine bivalve mollusks calcium-activated K+ ion channel caribbean ciguatoxins cationization ciguatera fish poisoning conotoxin cyanobacterial toxin cyanotoxins disulfide-rich peptide dopaminergic neurons