[1] E. zodiacus is a harmful diatom that has become known as the predominant organisms causing the bleaching of aqua-cultured nori seaweed (Pyropia yezonesis).

Cells are flattened and interlock by two apical elevations (horns) to form long curved colony formations.

[5] Eucampia zodiacus is very widely distributed in south temperate regions of warmer waters.

[6] Since the mid 1990s E. zodiacus blooms have been frequently detected off the coast of Japan during winter months through early spring.

Its blooms have caused the exhaustion of nutrients in the water column during the nori seaweed harvest season.