Vpak, or Vitality Pak, is an all natural, highly purified nutritional pack that has been shown to materially improve survival and production yields in cultured shrimp. Based on the principles of “Nutritional Immunology,” Vpak uses a unique blend of selected nutrients and natural bioactive substances to materially reduce the impact of stress and increase disease resistance. Vpak is not a therapeutic but rather a completely nontoxic activator of the non-specific immune system.