Wipe fish with damp cloth; sprinkle inside & out with salt & pepper; dip in flour. Heat half the butter & oil in large skillet; fry fish, until lightly browned, about 5 minutes per side. Remove fish to heated platter. Continue cooking remaining fish, adding more butter & oil as needed. Add shallots & garlic to pan juices; cook until tender. Combine wine, mustard, thyme & sage: add to shallots & cook until sauce is slightly thickened. Pour over fish & serve piping hot. Bass, lake trout & scup may be used.