NorthFin Jumbo Fish Formula Premium Food. Big fish means serious food, and that is what NorthFin’s Jumbo Fish Formula offers. Professionally formulated with whole Antarctic krill meal, high DHA Omega-3 whole herring meal, organic kelp and montmorillonite clay, you can be confident your large carnivore and omnivore fish obtain their daily nutrients. With NorthFin’s Jumbo Formula, your fish can indulge in a tasty nutritious treat with every bite. Available pellet size : 4, 6 mm Pellet type : Slow sinking pellets Recommended for : All types of freshwater carnivore and omnivore fish. Available Sizes: 4 mm (250 g, 500 g, 1 kg, 2.5 kg) 6 mm (250 g, 500 g, 1 kg, 2.5 kg)