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Pallid sturgeon are marked with small PIT tags injected under the skin

By Columbia Environmental Research Center
Pallid sturgeon are marked with small PIT (passive integrated transponder) tags injected under the base of the dorsal fin.
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Detailed Description

Pallid sturgeon are marked with small PIT (passive integrated transponder) tags injected under the base of the dorsal fin.  The tags be read with a special electronic reader that displays the 10-digit code that uniquely identifies the sturgeon. 

Sources/Usage

Public Domain.