This rapid tooth-growing pattern is an unusual one in the world of fish research—but probably not in nature
, reveals that the Pacific lingcod gains and loses an average of 20 teeth every day.
A voracious hunter, the lingcod eats “anything it can shove in its mouth,” Cohen says—and there’s a lot going on in its mouth.Photograph by Kimberly Schoenberger“The lingcod have a set of upper and lower jaws, just like ours, but they’re more mobile—they can be thrown forward and spread out,” she explains. “If you look inside the mouth on their palate, it’s also covered in teeth.
First, 20 juvenile lingcod were immersed in tanks spiked with the fluorescent dye alizarin red for 12 hours. Since alizarin red is attracted to the calcium in teeth, the result was hundreds of glowing-red gnashers. Over the next 10 days, batches of the lingcod were exposed to a second, green dye, calcein fluorescein. Teeth in place on day one of the study were stained red, while teeth that erupted later appeared green.
After examining the smiles of each of the 20 fish, Carr and her team learned that lingcod teeth are fated, meaning each tooth erupts exactly where it’s destined to spend the rest of its career. That’s contrary to other famously toothy fish like the great white shark, whose teeth start out tiny at the back of the jaw and move forward as they grow.
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