Of Course I have the answer... but I am old and slow.
Salmons are "co-dominant"... (well, technically they are dominant but we'll get into that in a sec.) What that means is, take everything you know about genetics and hets and reverse it.
A "Salmon" is really a het for hypo. A Super Salmon is really a homozygous hypo.
If you breed a salmon to a normal, you get approximately 50% salmons and 50% normals.
If you breed a salmon to a salmon, you get approximately 25% normals, 50% salmons, and 25% super salmons. Just like with the difference between hets for albino and normals, you cannot tell the difference just by looking at salmons vs. super salmons.
If you breed a super salmon to a normal, you get 100% salmons.
If you breed a super salmon to a salmon, you get 50% salmon and 50% super salmons.
All that make sense?
