San Francisco Bay Brand Frozen Omega Brine Shrimp have been gut-loaded with a lipid formula high in Omega-3 polyunsaturated fatty acids (PUFAs) in holding tanks prior to freezing. PUFAs have been proven to be essential nutrients for a wide variety of fish for maintaining their immune regulatory system, cell membrane fluidity & integrity, and various other regulatory functions. Consumption of Omega Brine Shrimp will help provide fish with these PUFAs.