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Journal of Heredity Advance Access published online on January 11, 2006
Journal of Heredity, doi:10.1093/jhered/esj010
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© The American Genetic Association. 2006. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.
Received July 2, 2005
Accepted November 28, 2005

Brief Communication

A Blue Variant in the Rainbow Trout, Oncorhynchus mykiss Walbaum

J. M. Blanc 1, Huguette Poisson 1, and Edwige Quillet 2 *

1 From INRA, Station d'Hydrobiologie, St-Pée-sur-Nivelle, France
2 From Laboratoire de Génétique des Poissons, 78350 Jouy-en-Josas, France

* To whom correspondence should be addressed.
Edwige Quillet, E-mail: Edwige.Quillet{at}jouy.inra.fr


  Abstract

A blue variant of the rainbow trout, which appeared in a French fish farm, displayed an iridescent body color that was cobalt blue on the back, lighter on the undersides, and silvery on the belly and which held up to adult stage. This color was supposed to result from a Tyndall effect involving a structural arrangement of melanin pigments because it disappeared when it was associated with a depigmenting gene. This blue variant appeared to be governed by an autosomal recessive gene. Blue fry survival and body weight were about 25% less than those of wild-type sibs, but no major problem was observed in further breeding performances, including reproduction. These features do not correspond with those of the blue variants previously described in the rainbow trout.


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