Such a system is already used extensively for juvenile salmon migrating
downstream on the Snake/Columbia river system. The tags are injected into
a body cavity of the juveniles, and when scanned as they swim by a
detector in a dam, the fish can be uniquely indentified.

Jim Lady
Columbia Basin Research
University of Washington
jlady at u.washington.edu


On Wed, 20 Nov 1996, Don Baccus wrote:

> >Under such a scenario, my suggestion would be to implant every bird with a
> >detection device just like those that protect books in some book stores, so
> >the legally exported birds could be monitored at any point.
>
> Such systems already exist for dogs, though I don't know how commonly
> they're in use. As an alternative to the old tag system (I think it's
> just a matter of injection by hypodermic).
>
> - Don Baccus, Portland OR <donb at rational.com>
> Nature photos, on-line guides, at http://www.xxxpdx.com/~dhogaza
>
>
>