I was at petsmart today and for .67cents I bought a bag of Herring Steaks in the cat treat section, not only does my cat love them but the crabs can have them too. They are 100% natural, this is what the package says.... Wholesome, made from dried pacific herring with no by products, fillers or rendered materials. Natural, absolutely no additives, preservatives, colouring or artificial flavorings. Nutritious, a natural source of Omega 3 fatty acids, protein, natural vitamins and minerals. Safe, processed under strict quality control to meet the highest standards of nutrition. Ingredients: 100% dried pacific herring Crude Protein Minimum 65% Crude Fat minimum 12% Crude Fiber Maximum 1% Moisture Maximum 10% Omega 3 Fatty Acids minimum 1.6% There is a website too snack21treats.com I wonder if they have other kinds. I thought for .67 cents that was a great deal and they are in a bag not a can.