剑尾鱼在检测细菌毒力方面的应用

Application of Xiphophorus helleri to detection of virulence of fish pathogenic bacteria

用 18株从鱼类所分离的细菌攻毒剑尾鱼 ,结果显示细菌对剑尾鱼的毒力与回归感染或攻毒敏感鱼的毒力结果较为一致 ,另外 ,用剑尾鱼感染病原菌的适宜途径为背肌注射 ,与原代比较 ,近交高代剑尾鱼个体之间对病原菌的反应较为一致 ,感染后死亡时间相对集中。

Swordtail fish (Xiphophorus helleri) were infected with 18 strains of fish bacteria. The result showed that the sensitivity of swordtail fish to the strains was coincident with that of the fishes from which the strains of bacteria were isolated or other sensitive fishes. It occurred notably stair changes of dead rates to strong, medium strong and weak virulence strains. The appropriate route of swordtail fish infected with pathogenic bacteria was injection in the dorsal muscle. The individual difference of the high generation swordtail to the pathogenic bacteria was less than the primary generation. And it had shorter time from the first infected fish to death to the last one of the same group. The research suggests that the purebred swordtail fish have good prospects as an aquatic laboratory animal in detection of the virulence of fish pathogenic bacteria.