Zepeda-Velázquez Andrea Paloma, Vega-Sánchez Vicente, Ortega-Santana César, Rubio-Godoy Miguel, de Oca-Mira Dany Montes, Soriano-Vargas Edgardo
Centro de Investigación y Estudios Avanzados en Salud Animal, Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma del Estado de México, Toluca 50200, Mexico.
Universidad Autónoma del Estado de Hidalgo, Instituto de Ciencias Agropecuarias, Tulancingo 43600, Hidalgo, Mexico.
Acta Trop. 2017 May;169:122-124. doi: 10.1016/j.actatropica.2017.02.013. Epub 2017 Feb 13.
Ten species of Aeromonas have been previously identified in farmed rainbow trout from Mexico. The aim of the current study was to investigate the pathogenicity of 10 Aeromonas isolates belonging to 10 different Aeromonas species in immersion experimentally-infected rainbow trout fry. Isolates of A. bestiarum, A. hydrophila, A. salmonicida, and A. veronii produced significant mortality (8.8%, 12.2%, 18.8%, and 8.8%, respectively). Isolates of A. caviae and A. sobria produced no significantly mortality (3.3% and 1.1%, respectively). No mortality was recorded in fish infected with A. allosaccharophila, A. lusitana, A. media, or A. popoffii. Microscopic lesions and bacterial reisolation were registered in liver of fish infected with the ten different Aeromonas isolates. Our results suggest that all Aeromonas species included in the study have the ability to colonize the liver. The results have confirmed that species A. bestiarum, A. hydrophila, A. salmonicida, and A. veronii affected fish as elsewhere reported. In conclusion, the variation in pathogenicity of Aeromonas isolates included in the study, emphasizes the importance of active, on-going monitoring of Aeromonas in the Mexican rainbow trout farming.
此前已在墨西哥养殖的虹鳟鱼中鉴定出10种气单胞菌。本研究的目的是调查属于10个不同气单胞菌物种的10株气单胞菌分离株对经实验性浸泡感染的虹鳟鱼苗的致病性。兽气单胞菌、嗜水气单胞菌、杀鲑气单胞菌和维氏气单胞菌的分离株导致了显著的死亡率（分别为8.8%、12.2%、18.8%和8.8%）。豚鼠气单胞菌和温和气单胞菌的分离株未导致显著死亡率（分别为3.3%和1.1%）。感染嗜糖气单胞菌、卢西塔尼亚气单胞菌、中间气单胞菌或波氏气单胞菌的鱼未记录到死亡情况。在感染了10种不同气单胞菌分离株的鱼的肝脏中记录到了微观病变和细菌再分离情况。我们的结果表明，本研究中包括的所有气单胞菌物种都有在肝脏中定殖的能力。结果证实，兽气单胞菌、嗜水气单胞菌、杀鲑气单胞菌和维氏气单胞菌对鱼的影响与其他地方报道的一致。总之，本研究中包括的气单胞菌分离株致病性的差异，强调了在墨西哥虹鳟养殖中对气单胞菌进行积极、持续监测的重要性。
