The advantages of Modified Atmosphere Packaging for fish are numerous. It enables retailers to keep enough product on hand during periods of heavy demand while minimizing the risks of product deterioration, as well as preserving fish quality long enough to supply distant markets. For instance, Salmon fillets from South America packaged in a modified atmosphere mother bag have enough extended shelf life to allow for shipping by sea, rather than air shipping, allowing the end user to save 30-35 cents per pound that air freighting adds to the product cost. Frozen fish can also benefit from modified atmosphere packaging. Frozen fish tastes stale and may have off odors when cooked and eaten, due to fat breakdown when exposed to air. With vacuum or gas back flush available, oxygen is removed and fat breakdown is reduced.