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A longfin damselfish.

A longfin damselfish.

Even though the oceans occupy the majority of the planet, scientists know far less about environmental factors that cause disease transmission in oceans than on land. Sikkel found evidence that longfin damselfish, such as this one pictured here, are infected by blood parasites, implicating gnathiids as possible disease spreaders.

Credit: P. Sikkel, Arkansas State University

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