Eye lens aging in the spiny dogfish (Squalus acanthias) I. Age determination from lens weight.

Measurements were made of lens wet weight, body length and spine diameter of male and female spiny dogfish Squalus acanthias. Age was estimated from body length and spine diameter. It appears that the dogfish eye lens grows continuously during life. Relationships were established between lens weight and age, which allow minimal age to be estimated from lens weight.