Ice-ice is a disease condition of seaweed. Ice-ice is caused when changes in salinity, ocean temperature and light intensity cause stress to seaweeds, making them produce a "moist organic substance" that attracts bacteria in the water and induces the characteristic "whitening" and hardening of the seaweed's tissues. Bacteria involved include those in the Vibrio-Aeromonas and Cytophaga-Flavobacteria complexes. The bacteria lyse epidermal cells and chloroplasts, turning the seaweed tissue white.
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