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Simon we marked juvenile (80-100 mm) rockfish (Sebastes) with VIE tags in Puget Sound some years ago. The tags worked well, and we were able to observe them clearly at night for around 270 days. We ended the study then for other reasons but the tags were still clearly visible after that time. We used regular halogen dive lights fitted with UV filters that we simply cut to match the size of the lens (fitting the filter inside or behind the lens). We observed no change in behavior when we illuminated the fish.
Jim West
James E. West, M.Sc.
Marine Resources Division
Washington Dept. of Fish and Wildlife
600 Capitol Way N.
Olympia, WA, 98501-1091, USA
(360) 902-2842
fax (360) 902-2943
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>>> [log in to unmask] 05/17/05 10:27 AM >>>
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Hello everybody,
I aim to study night activity of atlantic salmon fry in a field experiment.
Because I want to measure activity at the individual level, every fish used
in the experiment will be individually tagged using VIE tags (Visible
Implant Elastomer, http://www.nmt.us/products/vie/vie.htm). Such tags are
highly visible under low luminosity conditions when fluoresced with blue
light and amber filters.
However, in a laboratory experiment I found that atlantic salmon fry were
highly disturbed when illuminated with such light. I contacted the
fabriquant and they said to me that this problem can be resolved using UV
lamps.
I've got two questions:
-Has someone ever used such kind of UV lamps? Is it really
possible to fluoresce VIE tags with UV lamps?
-Where can I find waterproof UV lamps?
Moreover, if someone used to do underwater observation by night, I would be
greatful for any advice!
I look foward to hearing from you
Simon Blanchet
BLANCHET Simon
PhD student
Université Laval - Québec-Océan / CIRSA
Pavillon Alexandre-Vachon
Local 8022
Québec (Québec), Canada G1K 7P4
Téléphone : (418) 656-2131 poste 8022
courriel : [log in to unmask]
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