294 Prorocentrum minimum 微小原甲藻 Phylum: Dinoflagellata 门：甲藻門 Class: Dinophyceae 纲：甲藻綱 Order: Prorocentrales 目：原甲藻目 Family: Prorocentraceae 科：原甲藻科 Morphology Cells are relatively small and vary from triangular, oval to heart-shaped. Cells are relatively flat anteriorly, slightly narrow and rounded posteriorly. Two apical spines arise anteriorly. One apical spine is large and curved slightly while another one is small. 形態 細胞較小，形狀多變，呈三角形、橢圓形以及心形。細胞前端平坦，後端收窄但圓 潤，頂端具兩個小刺，一個較大，輕微彎曲，另一個較小。 Ecology and distribution Prorocentrum minimum is a cosmopolitan species in cold temperate to tropical waters inhabiting primarily estuarine and neritic habitats. Prorocentrum minimum is a bloom forming species and has caused numerous blooms in many countries. In Hong Kong coastal waters, Prorocentrum minimum formed 33 blooms in Hong Kong coastal waters from 1986 to 2023 and caused fish kill in 1990s. It is capable to produce venerupin (hepatotoxin) which may result in shellfish poisoning and further cause illnesses and even deaths in humans (Faust and Gulledge, 2002). 生態與分佈 本種從寒溫帶到熱帶的河口區域和近岸均有分佈。微小原甲藻是紅潮原因種，曾在 很多國家多次引發紅潮。1986年至2023年以來微小原甲藻在香港近岸也曾引發33
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