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Three phytoplankton species blooms which have been reported harmful to fisheries in UK waters are discussed:
(1) The armoured dinoflagellate Gonyaulax tamarensis has caused harmful levels to humans of paralytic shellfish poison in most years since 1968 in shellfish from sites on the British east coast between 54.5°N and 56.7°N. The months of maximum toxicity are May and June.
(2) Red tides of the naked dinoflagellate Gyrodinium aureolum have caused mortalities of wild marine animals in south-west England in 1978 and in North Wales in 1971, and killed farmed salmon in the west of Scotland in 1980. These red tides occurred between August and October. The dinoflagellate occurs all along the west coast of Britain and is often abundant at fronts.
(3) Blooms of flagellate X, possibly a species of Olisthodiscus or Chattonella, have killed farmed fish in sea-lochs on the west coast of Scotland in 1979 and 1982.

本文讨论了三种在英国水域被报道对渔业有害的浮游植物物种水华：
（1）装甲甲藻（armoured dinoflagellate）Gonyaulax tamarensis 自1968年以来，多数年份会在英国东海岸54.5°N至56.7°N之间海域的贝类中产生对人类有害的麻痹性贝类毒素（paralytic shellfish poison）。毒性最高的月份为5月和6月。
（2）裸甲藻（naked dinoflagellate）Gyrodinium aureolum 引发的赤潮曾于1978年在英格兰西南部、1971年在北威尔士导致野生海洋动物死亡，并于1980年在苏格兰西部造成养殖三文鱼死亡。此类赤潮发生在8月至10月之间。该甲藻广泛分布于英国西海岸，且常在锋面区域大量聚集。
（3）鞭毛虫X（flagellate X，可能属于Olisthodiscus属或Chattonella属）的水华曾于1979年和1982年在苏格兰西海岸的海湖中导致养殖鱼类死亡。