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A species of fish called the Pacific grouper has a total of 555 teeth packed in two sets of jaws.
A new study found that these fish have an amazing rate of tooth loss, with about 20 per day.
“Every bony surface in their mouth is covered with teeth,” said author Karly Cohen, a doctoral student in biology at the University of Washington.
The Pacific grouper (Ophiodon elongatus) is a predatory fish found in the northern Pacific Ocean. This fish can be up to 50cm long when mature, some types can reach 1.5m in length.
Instead of having incisors, molars, and fangs, these fish have hundreds of sharp and microscopic teeth. Their palate is also covered with hundreds of teeth.
Behind the main jaw is another auxiliary jaw, called the pharyngeal jaw, which this fish uses in the same way that humans use molars.
An animal’s teeth can reveal how and what kind of food they eat. The primary tooth is “the most abundant artifact in the fossil record with many species,” Cohen said.
Fish naturally lose a lot of teeth, but the problem Cohen poses is not knowing exactly how many teeth this fish loses.
Cohen and Emily Carr, biology students at the University of South Florida, raised 20 Pacific groupers at the University of Washington lab.
Because grouper teeth are so small, finding out how quickly these fish lose their teeth is not easy. Therefore, they put the grouper in a red tank to stain the fish’s teeth.
They then transferred the fish to a blue tank to stain their teeth one more time.
Then, Carr placed the tooth bones under the microscope and calculated the ratio of the red teeth to the blue teeth to the total number of teeth present in the mouth of the grouper. She counted more than 10,000 lost teeth from 20 fish.
From there, they concluded this fish loses an average of about 20 teeth per day. Teeth that grow in the oropharynx fall out much faster than teeth in other parts.
