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为研究青鱼暴发性死亡原因,从病症典型青鱼(Mylopharyngodon piceus)肌肉、肝脏和肾脏处进行细菌接种,分离获得一株细菌(HZ2015),对其进行了形态观察、生化特性检测和16S r RNA序列分析,通过动物回归实验、毒力检测和药敏试验了解其对青鱼的致病性、毒力及药物敏感性。所得菌株为类志贺邻单胞菌(Plesiomonas shigelloides),动物回归实验能复制出类似症状,且能从体内再次分离到该菌株;分离株对小鼠的半数致死量(LD50)为106.6 CFU;对头孢呋辛、头孢哌酮、庆大霉素、卡那霉素、复达欣高度敏感。研究表明,菌株HZ2015为青鱼体表溃烂病病原,本研究系类志贺邻单胞菌致青鱼体表溃烂病的首次报道。 相似文献
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乐佩琦 《中国海洋湖沼学报》1995,(2)
The pharyngeal dental formula of Mylopharyngodon piceus is 4-5 as a rule, and the dentition isasymmetrical. It is difficult to identify each tooth in the larval dentition. In this paper the appearancepattem of tooth germ with developmental process in this fish is described in detail. The formationpattern of the left dentition is contrasted with that of the right one. In the developmental process,the left pharyngeal dentition lacks teeth at position An3. Thus the left dentition is D-type as designatedby Nakajima(1984), while the right one is A-type. 相似文献
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乐佩琦 《中国海洋湖沼学报》1995,(3)
Adult pharyngeal teeth in Mylopharyngodon piceus are molariform. Based on SEM observations ofthe developing teeth, this paper describes the morphological diversification of pharyngeal teeth in M.piceus. The larval and juvenile teeth are changed from conical to adult molariform teeth through sevenstages. Comparisons are made between each stage and corresponding types in some species of differentsubfamilies in Cyprinidae. It is considered that the ontogenetic resemblances of the pharyngeal teehbear relationship to the phylogeny of cyprinids. 相似文献
4.
Adult pharyngeal teeth inMylopharyngodon piceus are molariform. Based on SEM observations of the developing teeth, this paper describes the morphological diversification
of pharyngeal teeth inM. piceus. The larval and juvenile teeth are changed from conical to adult molariform teeth through seven stages. Comparisons are made
between each stage and corresponding types in some species of different subfamilies in Cyprinidae. It is considered that the
ontogenetic resemblances of the pharyngeal teeth bear relationship to the phylogeny of cyprinids.
This project was funded by the International Cooperation of Japan—China and the National Natural Science Foundation of China 相似文献
5.
The pharyngeal dental formula ofMylopharyngodon piceus is 4–5 as a rule, and the dentition is asymmetrical. It is difficult to identify each tooth in the larval dentition. In this
paper the appearance pattern of tooth germ with development process in this fish is described in detail. The formation pattern
of the left dentition is contrasted with that of the right one. In the developmental process, the left pharyngeal dentition
lacks teeth at position An3. Thus the left dentition is D-type as designated by Nakajima (1984), while the right one is A-type.
This project was funded by the International Cooperation of Japan-China and the National Natural Science Foundation of China. 相似文献
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