The Bicolor Parrotfish (Cetoscarus bicolor) is a large and vibrant marine species native to the Red Sea. Renowned for its striking coloration and significant size, this species plays a crucial role in the health and maintenance of coral reef ecosystems.
Key Information
• Small fish safe: Yes
• Small invertebrate safe: ❌ No (feeds on corals and other sessile invertebrates)
• Coral safe: ❌ No (actively consumes live corals)
• Minimum tank size: 5,000 litres (1,319 gallons)
• Adult size: Up to 90 cm (35.4 inches)
• Diet: Herbivorous, primarily feeding on algae; also ingests coral polyps and calcareous substrates
• Be aware of: Requires a very large aquarium due to its size; not suitable for typical home aquariums; can cause significant bio-load due to its feeding habits
Appearance and Colouration
C. bicolor exhibits notable changes in coloration as it matures:
• Juveniles: Display a distinctive white body with an orange-red head and a prominent black spot on the dorsal fin.
• Adults: Transition to a more uniform coloration, often showcasing shades of green, blue, or brown, with subtle patterns depending on the individual.
Natural Habitat and Behaviour
Inhabiting coral reefs, C. bicolor is typically found at depths ranging from shallow waters to about 30 meters. These fish are diurnal and spend their days grazing on algae and corals, playing a vital role in controlling algal growth and bioerosion of reefs.
Aquarium Care
Due to its substantial size and specific dietary needs, the Bicolor Parrotfish is not recommended for home aquariums. Successful maintenance requires:
• Tank Size: A minimum of 5,000 litres to accommodate its growth and swimming needs.
• Diet: A continuous supply of natural algae and supplemental feeding with marine-based foods.
• Environment: Robust filtration systems to manage the heavy bio-load and a tank setup that mimics natural reef structures.
Important Considerations
• Reef Compatibility: C. bicolor is not reef-safe. Its feeding habits can lead to the consumption of live corals and damage to reef structures.
• Behaviour: Generally peaceful towards other large fish but may exhibit territorial behaviour, especially in confined spaces.
• Conservation: While not currently listed as endangered, responsible aquarium practices are essential to prevent overexploitation of wild populations.
Summary
The Bicolor Parrotfish (Cetoscarus bicolor) is a remarkable species that contributes significantly to the health of coral reef ecosystems. Due to its size and specialised care requirements, it is best appreciated in the wild or in large public aquariums designed to accommodate its needs. Hobbyists are encouraged to consider more suitable species for home aquariums to ensure the well-being of both the fish and the reef environment.