Zebra Mussel -> Salmon

There's an Atlantic Salmon relative that is able to eat mollusks, using its gizzard. The Gillaroo, Salmo stomachicus, eats mostly snails in Lough Melvin, Eire. Crossed with Salmo salar, the Atlantic salmon, perhaps the offspring could be selected to eat Zebra mussels,(Dreissena polymorpha) or Quagga mussels (Dreissena bugensis), where invasive in Atlantic salmon native range. The hybrid salmon would be halfway native in such ranges, being half Atlantic salmon. Perhaps this hybrid could be genetically modified to digest organic toxins and excrete inorganic ones that might otherwise bio-accumulate from the oft-polluted Zebra and Quagga mussels, yielding purified salmon for the table.