“…Supplementation of a probiotic in diet can also modulate gastrointestinal microbial communities (Akhter, Wu, Memon, & Mohsin, ; Bron, van Baarlen, & Kleerebezem, ; Nayak, ). A number of researchers have suggested that gram‐positive bacteria such as Carnobacterium , Enterococcus , Lactobacillus , Lactococcus , Micrococcus , Streptococcus, and Weissella, as well as gram‐negative bacteria such as Aeromonas , Alteromonas , Photorhodobacterium , Pseudomonas , and Vibrio can be used as successful probiotics in fish and shrimp (Chi et al., ; Gibson & Roberfroid, ; Iwashita, Nakandakare, Terhune, Wood, & Ranzani‐Paiva, ; Kim, Harikrishnan, Kim, Balasundaram, & Heo, ). In addition, the use of immune stimulants such as pro‐ and prebiotics may enhance the non‐specific defense mechanisms.…”