Zignature's Trout and Salmon Meal Formula combines two of the healthiest fish protein sources in the world. Both fish are high in heart-healthy Omega-3 fatty acids. They are also rich in minerals, namely potassium, phosphorous, and selenium. We bring together two great tasting fish that you dogs will love. Zignature® Trout and Salmon Meal Formula – Learned from Nature, Crafted to Perfection.