A friend informed me that omble chevalier (loach?) is a different fish and shouldn't be confused with ombre (grayling):
 
The real fish is OMBLE CHEVALIER, but another fish is called ombre, for its colour as  you mentioned, but not to be confused with the former.

http://www.google.com/search?client=safari&rls=en&q=omble+chevalier&ie=UTF-8&oe=UTF-8
 
Is Ada's "Ombre chevalier" a misprint? Or is Mlle Larivière (as I suspect) confusing one fish with another?
 
ASklyarenko
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