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Bacillariophyta—the diatoms

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Pfiesteria—a toxic dinoflagellate that<br />

forms lesions on fish skin<br />

Found in coastal rivers and estuaries<br />

mainly along the US east coast<br />

Pfiesteria piscicida<br />

Complex life-cycle with free living and<br />

parasitic ameboid phases—can produce<br />

toxins that are harmful to fish and possibly<br />

humans.<br />

Estuarine Associated Syndrome<br />

Symptoms include: headache, dizziness, skin rashes,<br />

nausea, muscle cramps, and short-term memory loss.<br />

However, not all Pfiesteria organisms are toxic

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