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从尼罗罗非鱼肠道中分离出41株好氧菌和6株厌氧菌。好氧菌中31株为革兰氏阴性菌,10株革兰氏阳性菌;厌氧菌中,革兰氏阳性菌5株,革兰氏阴性菌1株。41株好氧菌中有31.7%的菌株能分泌蛋白酶(13株菌);有39.0%的菌株能分泌脂肪酶(16株菌);有17.1%的菌株能产淀粉酶(7株菌),有36.6%的菌株能产纤维素酶(15株菌)。其中,产3种酶的有7株菌,产2种酶的有9株菌,产1种酶的有12株菌,不产酶的有13株菌。好氧菌在尼罗罗非鱼消化食饵过程所起的作用大;6株厌氧菌中仅有1株菌能产脂肪酶和纤维素酶,对尼罗罗非鱼消化食饵所起作用相对不大。优化罗非鱼肠道中微生物菌群的结构很有必要。
41 strains of aerobic bacteria and 6 strains of anaerobic bacteria were isolated from the gut of Nile tilapia. 31 strains of aerobic bacteria were Gram-negative bacteria, 10 Gram-positive bacteria; anaerobic bacteria, Gram-positive bacteria 5 strains, Gram-negative bacteria 1 strain. Among 41 strains, 31.7% strains secreted protease (13 strains), 39.0% strains could secrete lipase (16 strains), 17.1% strains could produce amylase (7 strains) 36.6% of strains can produce cellulase (15 strains). Among them, there are 7 strains producing 3 kinds of enzymes, 9 strains producing 2 kinds of enzymes, 12 strains producing 1 kind of enzymes and 13 strains not producing enzymes. Aerobic bacteria play a significant role in the process of digestion and prey of Nile tilapia. Only one of the six strains of anaerobic bacteria can produce lipase and cellulase, which play a role in the digestion of bait of Nile tilapia Not big. It is necessary to optimize the structure of microbial flora in the gut of tilapia.