PondBuilder presents its Sakana fish food line, formulated for year-round feeding. The food contains spirulina—a blue-green algae food supplement—for maximum color enhancement, and nitrogen to ensure maximum freshness, the company states. Beneficial nutrients such as vitamin C help goldfish and koi develop healthy immune systems all season long, the company adds. The food pellets are available in small or large pellets, and the line comes in 8 oz. to 19.5 lb. seal-tight containers.