You mean POSITIVE 15 per mil? If not, this could indicate that these fish come from the sea, where such values are common for carnivorous fish. I don't know if this is your case, but as far as I know salmon are fishes that born in the freshwater, live in the sea and come back. Most of their  meat should come from marine sources.

Matheus C. Carvalho

PhD student

Kitasato University - School of Fishery Sciences

Japan

--- Em ter, 24/6/08, Bjoern Wissel <[log in to unmask]> escreveu:
De: Bjoern Wissel <[log in to unmask]>
Assunto: [ISOGEOCHEM] high del13C values in stream fish
Para: [log in to unmask]
Data: Terça-feira, 24 de Junho de 2008, 19:39

HI,
we ran a number of salmonid fish muscle and liver tissue samples for a small 
stream in Quebec and came across fairly high de13C values (around 15 per 
mil). I assume that terrestrial insects that rely on C4 plants are not an
option 
in temperate regions. Does anyone know what food sources might have such 
high values, or could it be a physiological effect? I am open to any 
suggestions and speculations....
Thanks, Bjoern

Björn Wissel, PhD
EQAL Manager, Faculty of Science
Adjunct Professor, Department of Biology
265.2 Laboratory Building
University of Regina
Regina, SK S4S 0A2 Canada
phone    306 585-4890
fax      306 337-2410
e-mail   [log in to unmask]


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