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red tide

red tide
A red tide is an ocean-coloration effect caused by a population explosion of certain dinoflagellates which release may also release an alkaloid, poisonous to fish, into the water. A more general name for this type of phenomenon is algal bloom. Red tides are typically seen in areas near the coast. The red coloration is due to photosynthetic pigments present in the organisms, which become visible on a large scale in high concentrations.

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