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Dictyota
Dictyota sp.
Chromista›Ochrophyta›Phaeophyceae›Dictyotaceae
📍 Worldwide in tropical and subtropical seas
Flat, iridescent brown-olive blades that spread over rockwork and corals. Beautiful under certain lighting — shimmers blue-green — but highly invasive in reef tanks. Produces chemical deterrents that most fish avoid. Very difficult to eliminate; manual removal stimulates regrowth. Sea urchins (Diadema) and Thalassoma wrasses occasionally graze it.
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Quick Facts
- role
- nuisance — persistent
- cause
- high nutrients, low herbivore pressure
- control
- Diadema urchin, manual removal, reduce nutrients
- warning
- extremely difficult to eradicate once established; chemical deterrents repel most fish