| Summary: | <i>Chrysotila dentata</i> (Haptophyta), a harmful algal bloom (HAB) species frequently occurring in coastal waters of China, is one with strong environmental adaptability that poses a serious threat to marine ecosystems and fisheries. Current molecular detection techniques and early warning systems for this species remain limited. To address this, we developed a rapid and highly sensitive detection method for <i>C. dentata</i>. This method integrates recombinase polymerase amplification (RPA) with CRISPR-LbaCas12a and lateral flow dipstick (LFD) technologies, enabling visual readout of results. Key parameters, including the single-stranded DNA (ssDNA) reporter concentration, reaction time, and temperature, were systematically optimized. Field water sample testing demonstrated high specificity and sensitivity, achieving a detection limit of 5 × 10<sup>−6</sup> pg μL<sup>−1</sup> for genomic DNA under laboratory conditions and 2.82 × 10<sup>1</sup> cells mL<sup>−1</sup> in simulated environmental samples. The entire detection process takes only 1 h (at a constant 39 °C), and results can be directly interpreted via LFD strips. For early warning and prevention of <i>C. dentata</i> outbreaks, this assay provides a powerful, reliable, and field-ready monitoring tool.
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