为了解达氏鳇肠道微生物组成特征,采集6尾喂养人工配制饲料4周的达氏鳇后肠内容物分别提取DNA,并利用16S r RNA V3-V4变异区扩增子高通量测序的方法分析达氏鳇幼鱼肠道微生物组成与多样性。结果显示:6个样本共获得541575条有效序列,73...为了解达氏鳇肠道微生物组成特征,采集6尾喂养人工配制饲料4周的达氏鳇后肠内容物分别提取DNA,并利用16S r RNA V3-V4变异区扩增子高通量测序的方法分析达氏鳇幼鱼肠道微生物组成与多样性。结果显示:6个样本共获得541575条有效序列,73个操作分类单元(OTUs)。73个OTUs隶属于7个门,其绝对优势菌群在门、目、科、属分类水平上分别为厚壁菌门(98.253%)、梭菌目(98.216%)、梭菌科(98.137%)、狭义梭菌属(92.892%)。序列注释发现,梭菌属中绝大部分为具有降解糖类为短链脂肪酸功能的Clostridium colicanis。此外,还分布有少量的分节丝状菌(3.99%)、鲸杆菌属(1.22%)等菌群。展开更多
Larval digestive organs of Amur sturgeon,Acipenser schrenscki and hybrid sturgeon(Huso Huso♀×A.schrenscki♂) hatched out at 17～21℃ were successively observed under Olympus microscope after being sectioned. His...Larval digestive organs of Amur sturgeon,Acipenser schrenscki and hybrid sturgeon(Huso Huso♀×A.schrenscki♂) hatched out at 17～21℃ were successively observed under Olympus microscope after being sectioned. Histological development of yolksac, pharyngeal cavity, esophago, stomach, intestine, pyloric caecum, liver and pancreas is described. It shows that the development of the digestive organs of the two fishes is similar to several other Acipenseridae fishes. Characters of the digestive organs about the two fishes and the relationships among earlier development period, ingestion, digestion and absorption are discussed.展开更多
文摘为了解达氏鳇肠道微生物组成特征,采集6尾喂养人工配制饲料4周的达氏鳇后肠内容物分别提取DNA,并利用16S r RNA V3-V4变异区扩增子高通量测序的方法分析达氏鳇幼鱼肠道微生物组成与多样性。结果显示:6个样本共获得541575条有效序列,73个操作分类单元(OTUs)。73个OTUs隶属于7个门,其绝对优势菌群在门、目、科、属分类水平上分别为厚壁菌门(98.253%)、梭菌目(98.216%)、梭菌科(98.137%)、狭义梭菌属(92.892%)。序列注释发现,梭菌属中绝大部分为具有降解糖类为短链脂肪酸功能的Clostridium colicanis。此外,还分布有少量的分节丝状菌(3.99%)、鲸杆菌属(1.22%)等菌群。
文摘Larval digestive organs of Amur sturgeon,Acipenser schrenscki and hybrid sturgeon(Huso Huso♀×A.schrenscki♂) hatched out at 17～21℃ were successively observed under Olympus microscope after being sectioned. Histological development of yolksac, pharyngeal cavity, esophago, stomach, intestine, pyloric caecum, liver and pancreas is described. It shows that the development of the digestive organs of the two fishes is similar to several other Acipenseridae fishes. Characters of the digestive organs about the two fishes and the relationships among earlier development period, ingestion, digestion and absorption are discussed.
