About the size of a diamond and comes from the inner ear of a fish, this tiny construction holds a treasure trove of information--a calcium carbonate microchip made of bone and accessed by a laser. Let’s take a look at the science of otoliths. An otolith is a fish ear bone (from the Greek words oto, meaning ear and lithos, meaning stone). From every population of fish Heidi Golden finds, she preserves a number of otoliths to take back to the lab. These bones are roadmaps of Arctic grayling lifetimes.
Provided by Frontier Scientists