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Jim: What kind of UV filters? Were they blocking all wavelengths BUT
UV? (Most UV-pass filters also lead IR, incidently) If these were
UV-pass filters, where did you get them and how did you see what you
were doing? Halogen bulbs seem to put out a fair bit of UV, but much of
that is blocked by the standard lens on a dive light--there may still
be enough to be useful, but I'd be very interested in the details if
you still have them.
Thanks, Pete
----------------------------------
Peter A. Nelson, Ph.D.
Marine Fisheries Advisor
University of California
Sea Grant Extension Program
2 Commercial Str, Suite 4
Eureka, California 95501
tel 707.443.8369
fax 707.445.3901
On May 18, 2005, at 8:49 AM, Jim West wrote:
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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
> [log in to unmask]
>
>>>> [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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