本文报道了从黄鳍鲷消化道中分离细菌的数量与组成。结果表明，好气异养细菌9．0×105～8．3×107个／g。其中含见丁质分解菌3．8×105～3．7×106个／g，弧菌1．1X10’～1．8×104个／g。共分离232株细菌。其种群组成为弧菌、不动杆菌、气单胞菌、假单胞菌、埃希氏菌、无色杆菌、节细菌和链球菌等8属。并测定其生。特性，表明该类菌对多种有机质具有强的分解能力，这些特姓有利于鱼类对营养物质的消化和吸收，促进其生长。 This article reports the number and composition of bacteria isolated from the digestive tract of the yellow fin fin. The results showed that the number of aerobic heterotrophic bacteria 9.0 × 105 ~ 8.3 × 107 个 / g. It contained 3.8 × 105 ~ 3.7 × 106 cells / g of bacteria and 1.1 × 10 ’~ 1.8 × 104 cells / g of Vibrio parahaemolyticus. A total of 232 strains of bacteria were isolated. Its population is composed of Vibrio, Acinetobacter, Aeromonas, Pseudomonas, Escherichia, Achromobacter, Arthrobacter and Streptococcus and other 8 genera. And determine the students. Characteristics, indicating that these bacteria have a strong ability to decompose a variety of organic matter, these special surname is conducive to fish digestion and absorption of nutrients to promote their growth.