Abstract: Gut microbiota play an important role in the growth and development of host animals, with huge abundance and complex structure. The studies of freshwater fish mainly focused on the influence of intestinal microbes on fish growth metabolism, absorption of nutrient, and immune regulation. By contrast, knowledge on marine fish remains relatively limited, which mainly focused on microbial diversity and the factors affecting and shaping the gut microbial community structure. By summarizing the functions and research methods of intestinal microorganisms in fish, we analyzed current status and development prospects of intestinal microorganisms in marine fish growth and development regulation, feeding habits, environmental adaptability and pollutant indication, with the aim to provide inspiration and reference for future interdisciplinary research on marine fish intestinal microorganism.

Key words: marine fish, gut microbiota, biological function, environment, feeding habit, water pollutant.