PE Mysis Proudly Available Here at PJ's. PE Mysis is promoted as one of the best Mysis shrimp available! As seen in TFH, FAMA Magazines so you know what this is and is used in many public aquariums. PE Mysis are collected when the shrimp are feeding and are naturally gut-loaded full of phytoplankton to contain 3 to 7 times the amount of omega 3 highly unsaturated fatty acids and the highest protein content to produce exceptional health and coloration in fish and LPS corals. Great for your Freshwater fish to.