Ichthyological terms, not general ones.
Phylum of generally blue-green coloured bacteria, often confused with algae, that obtain their energy via photosynthesis and include unicellular and colonial species. Some species occur commonly in aquaria where they're normally regarded as pests.
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See 'cyanobacteria'.
Sessile, aquatic organisms that live attached to submerged surfaces in aquatic environments. Often complex in form and may comprise organisms from several groups including algae, cyanobacteria, other microbes, and detritus.
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The photosynthesizing constituent of a planktonic community, consisting of algae, cyanobacteria and other microorganisms.
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Possessing cells without membrane-bound nuclei. Typical in bacteria and cyanobacteria.