Glossary V

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velocity: Rate at which water travels downstream in a river or stream and is usually measured in centimeters per second (cm/s).
ventral: Refers to the underside of an organism.
vermiculations: "Worm-like" markings on the skin of certain trout, such as brook trout. These marking are useful for identifying brook trout from bull trout. Brook trout also have black markings on their dorsal fin and bull trout do not.
visible implant (vi) tags: Very small (1-2 mm), individually coded alpha-numeric (example: J71) tags implanted into any clear tissue (commonly inserted behind the eye in trout).
visible implant elastomer (vie) tags: Externally visible, internally implanted fluorescent plastic tag that is inserted into clear tissues using a small needle. The tag remains in liquid form until it solidifies after injection, but remains pliable. VIE tags are often used to distinguish groups of fish.