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First report of pughead skeletal deformity in a Queen Angelfish

By Shane Graber - Posted Nov 08, 2012 11:00 AM
Few reef fish in the wild are reported with this condition and now two Queen Angelfish at the St. Peter and St. Paul Archipelago, Mid Atlantic Ridge, Brazil are reported with this abnormality. What caused it?
First report of pughead skeletal deformity in a Queen Angelfish

Fig. 1 a A healthy queen angelfish H. ciliaris (about 35 cm total length) and b A pughead H. ciliaris (about 30 cm total length) at St. Peter and St. Paul Archipelago, Mid Atlantic Ridge, Brazil

A pughead skeletal deformity is where the entire top jaw is compressed downward, which ends up making the bottom jaw look like it is pushed outward.  While pughead skeletal deformities are more common in captive fish, this condition is relatively rare in wild fish. In captive populations, this condition is typically attributed to "chemical contaminants, dietary limitations or excesses, temperature variations during larval development, and inbreeding."

According to Francini-Filho  and Amado-Filho, the two scientists who reported this abnormality in the journal Coral Reefs, this is the first recorded incident of pughead skeletal deformity reported in Queen Angelfish and in the family Pomacanthidae.

During a diving trip between May 24 and June 8, 2011, they found two Queen Angelfish, Holacanthus ciliaris, while at St. Peter and St. Paul Archipelago, Mid Atlantic Ridge, Brazil. Both fish were large, ranging from 30 to 35 cm in length (12-14 inches) and appeared healthy with the exception of the pughead skeletal deformity. Given that inbreeding and low genetic connectivity are already reported for this species in St. Peter and St. Paul Archipelago, Francini-Filho and Amado-Filho both believe this is what caused the abnormality.

Author: Shane Graber
Location: Indiana

Shane has kept saltwater tanks for the last 12 years, is a research scientist, lives in northern Indiana, and is a proud Advanced Aquarist staffer.

Website: http://www.advancedaquarist.com/.

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