SYNSEA™ FeedAd, a probiotic complex customized for aquatic livestock, contains PP4012, the only Lactobacillus strain isolated from fish sources, and several other patented probiotics. It is suitable for addition to aquatic livestock feed, and provides the following benefits: improved growth efficiency and regularity of fish and shrimp, suppressed growth of harmful early mortality syndrome (EMS)-causing bacteria, reduced mortality rates associated with Vibrio anguillarum and Photobacterium infections, increased dissolved oxygen in water, enhanced tolerance abilities of aquatic livestock, greatly increased feed conversion rate, and shortened feed cycles. SYNSEA™ FeedAd can be mixed with feed and fed directly to the livestock, and is also suitable for pelleting.