Moorish Idol vs. Longfin Bannerfish

  • 4 years ago
There are two very similar-looking reef fish which divers often encounter in tropical waters of the Indian & West Pacific Oceans. Because they look very similar, and they are rarely seen together, it's very easy to misidentify them.
The common names of these fish are the Moorish Idol and the Longfin Bannerfish (a.k.a. Pennant Coralfish). They are similar in size & shape, and they both have two broad black vertical stripes. They also both have long, white frontal dorsal fins.
To tell the difference, the Morrish Idol (Zanclus cornutus) has a long snout and a black tail fin. But the Longfin Bannerfish (Heniochus acuminatus) has a white face without a long snout. Its rear dorsal and tail fins are yellow.

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