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First-of-Its-Kind Bright Orange Nurse Shark Recorded Off Costa Rica Makes History
This is the first-ever recorded case of xanthism in this species and in the Caribbean Sea.

The nurse shark (Ginglymostoma cirratum) was seen in Costa Rican waters during a sport fishing trip near Tortuguero National Park last year, and the photos were shared on its Facebook page. According to a new paper, the shark was captured at a depth of 37 meters (and subsequently released), was around 2 meters long (6.5 feet), and had yellow-orange skin. This indicates a condition known as xanthochromism and is the first documented case of xanthism in the species and the first record of any species in the Caribbean Sea.
It also had white eyes "with no visible irises", instead of the typical black, which the researchers suggest indicates a rare case of albino-xanthochromism rather than just xanthism alone. Until now, there has been no documentation of partial or full xanthism in cartilaginous fishes in the Caribbean or the Pacific coasts of Costa Rica
