1. The vestibular system consists of the otolith organs and the semicircular canals. 2. The oldest known individual was 11 years old based on otolith rings. 3. Otolith size is also proportional to the length and weight of a fish.4. A statocyst with a single otolith is attached dorsally to each pedal ganglion. 5. Otolith microchemistry has been used to accurately identify estuarine nursery areas of fish.6. However, some studies disprove a direct link between body growth and otolith growth. 7. Otolith microstructural studies exist for 50 families and 135 species of fish and squid.8. In recent years otolith microchemistry has shown that this is not always the case. 9. This relationship is clearly evident in otolith chemistry. 10. The calcium carbonate that the otolith is composed of is primarily derived from the water. 
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