Kole X Chevron Tang Hybrid At Pacific Island Aquatics

Joe RowlettBy Joe Rowlett 2 years ago
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At first glance, this darkly colored tang might not seem like anything particularly special, but it’s probably one of the rarest hybrids to enter the aquarium trade. It was collected in Hawaii and is said to be one of just a handful of its kind to have ever been found.  

Ctenochaetus strigosus X C. hawaiiensis. Credit: Pacific Island Aquatics

 Some quick detective work reveals the parents of this specimen as likely being a Kole Tang (Ctenochaetus strigosus) and a Chevron Tang (C. hawaiiensis). The salient traits to look for here are the gold ring around the eyes and the spotted head, both associated with C. strigosus, as well as the relatively dark colors of the body and the faint trace of orange in the opercular spots, which hint at C. hawaiiensis.  

Note the unusually dark body and the faint orange of the opercular spots. Credit: Pacific Island Aquatics

 These are, in fact, the only two species of bristletooth tang to occur in Hawaii, so it’s no great surprise that they would interbreed on occasion. But it is a bit perplexing that this hybrid should be so uncommon given that both of the parent species are closely related and fairly abundant in the region. You might think that with such large population sizes there would be ample opportunity for interspecies pairs to form, but the opposite might be true. It may be that there just isn’t all that much incentive for these fishes to mate outside their own species when there are so many of their own kind swimming around. 

Top: Kole Tang (C. strigosus) Bottom: juvenile and adult C. hawaiiensis. Credit: John Randall / fishbase

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Joe Rowlett
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 Joe Rowlett

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Joe is classically trained in the zoological arts and sciences, with a particular focus on the esoterica of invertebrate taxonomy and evolution. He’s written for several aquarium publications and for many years lorded over the marinelife at Chicago’s venerable Old Town Aquarium. He currently studies prairie insect ecology at the Field Museum of Natural History and fish phylogenetics at the University of Chicago.

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