Chelmonops truncatus, also known as the eastern talma or truncate coralfish, is a captivating marine ray-finned fish belonging to the butterflyfish family (Chaetodontidae). This unique species is endemic to Australia.
Here are some fascinating details about the Chelmonops truncatus:
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Description: The Chelmonops truncatus bears a striking resemblance to the Western talma (C. curiosus). The primary difference lies in the dorsal fin: while the Western species has a long filament, the dorsal fin of the Chelmonops truncatus is truncated. The fins and dark bands on its body often exhibit a vinaceous tinge, giving them a dark, reddish appearance in certain lighting conditions. Juveniles of this species have an obvious ocellus (eye-like spot) on their dorsal fin, which becomes less pronounced as they mature. Additionally, the rear part of the dorsal fin appears smoother in younger fish and elongates slightly in adults.
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Size: The Chelmonops truncatus reaches a maximum total length of approximately 22 centimeters (about 8.7 inches).
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Distribution: This butterflyfish is found along the southeastern coast of Australia, ranging from Double Island Point in southern Queensland to around Jervis Bay in New South Wales.
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Habitat and Diet: Chelmonops truncatus inhabits coastal bays and estuaries, where it resides along deep rocky walls. Adults are often encountered in pairs, while juveniles are frequently solitary. Their diet includes small crustaceans, worms, and filamentous algae. Pairs of these fish defend territories.
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Aquarium Trade: Although rare in the aquarium trade, the Chelmonops truncatus is almost never exported from Australia.
Next time you explore the underwater wonders of Australia, keep an eye out for this intriguing butterflyfish!
