摘要
本文报道三种鲤对嗜水气单胞菌引起暴发性鱼病的抗病力试验结果。当菌液浓度为６．０×１０￣８ＣＦＵ／ｍｌ，采用１０￣０、１０￣（－１）、１０￣（－２）、１０￣（－３）四个稀释度、０．３ｍｌ／尾注射剂量时，建鲤、野鲤和镜鲤的半数致死量（ＬＤ＿（５０））分别为１０￣（－１．３７５）、１０￣（－０．９７６）、１０￣（－０．５６２）。这三种鲤的半数致死量差异显著（Ｆ＞Ｆ＿（０．０５））。从四个方面研究了抗病机理：白细胞吞噬功能和补体替代途径（Ｃ＿３旁路）杀菌能力，镜鲤较强于野鲤和建鲤，但无显著差异（Ｆ＜Ｆ０．０５）；红细胞Ｃ＿（３ｂ）受体花环率和补体总量（单位／ｍｌ），是建鲤＞野鲤＞镜鲤，差异极显著（Ｆ＞Ｆ０．０１）。本研究结果还表明建鲤的红细胞Ｃ＿（３ｂ）受体花环率和补体总量稍高，但对暴发性鱼病病原（嗜水气单胞菌）较易感染。以上结果证明，不同品系鲤鱼对暴发性鱼病有种内特异性。
This paper reports the resistance variation of wild, mirror and jian common carps to the outbreak-fish-disease caused by the Aeromonas hydrophilla. When the bacteria concentration was 6. 0 ×108 CFU/ml (four gradients at 100, 10-1, 10-2 and 10-3), injection dosage was 0. 3 ml/fish, the median lethal dose (LD50) for wild carp, mirror carp and jian carp was 10-0. 976, 10-0. 562 and 10-1. 375 respectively, which indicated that there was a significant difference in the median lethal dose among strains (F>F0.05). The mechanism of resistance was studied from 4 sides: In sides of leucocyte phagocytic function and bactericidal reaction by alternative pathway of complement (C3 shunt), mirror carp was higher than wild carp and jian carp without significant differences (F<F0.05); in the sides of erythrocyte C3b receptors-aggregates and the total amount of complements, the rank was jian carp >wild carp>mirror carp at a high significant differences (F>F0.01 ). Erythrocyte C3b receptorsaggregates and the total amount of complements are two important indicators which reflect the immune capacity of fishes. This study found that the jian carp is little higher in these two indicators, but it is more infectious to the pathogen of outbreak-fish-disease, Aeromonas hydrophilla, this situation represents that different strains of common carp have a within species heterogeneity to outbreak-fish-disease.
出处
《水产学报》
CAS
CSCD
北大核心
1994年第4期290-296,共7页
Journal of Fisheries of China
关键词
建鲤
野鲤
散鳞镜鲤
暴发性鱼病
抗病力
wild common carp
mirror common carp
jian common carp
outbreak-fish-disease
resistance
