Mackerel Loin Plain. This succulent Mackerel Loin can be served whole or broken into pieces. Applaws Cat Treats is great for your pets nutrition. The ultimate healthy snack, Applaws Loins can be served either whole or broken into pieces. As a natural source of Omega 3 essential fatty acids, each 30g Loin offers your cat a low fat, high protein everyday treat. 100% Mackerel - We insist on only the highest quality, human grade fish protein in this pouch. 100% Natural - Nothing added, Nothing hidden. Innovative packaging - See the quality of our ingredients with our see-through packaging.