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- Title
Nocardiosis and other common diseases of cultured golden pompano (Trachinotus blochii) in Taiwan.
- Authors
Yan, Wei‐Xiao; Tseng, Yu‐Han; Huang, Wen‐Rou; Cheng, Li‐Wu; Wang, Pei‐Chi; Chen, Shih‐Chu
- Abstract
Golden pompano (Trachinotus blochii) is a carnivorous teleost cultured in the Asia‐Pacific region. Fish culture in high densities and numbers results in disease outbreaks, causing huge economic losses. Here, we collected cultured golden pompanos from 2021 to 2022 and identified the pathogens isolated from the diseased fish. Out of a total of 64 clinical cases observed in both sea cages and fish ponds, it was found that Nocardia seriolae was the predominant pathogen (26%), followed by Lactococcus garvieae (13%). Trichodina spp. was the most prevalent parasite in sea cages and earthen ponds (21%), while Neobenedenia spp. was the primary parasitic pathogen (16%) in sea cages. Given these findings, further investigations were conducted, including antibiotic susceptibility and pathogenicity tests specific to N. seriolae in golden pompanos. Antibiotic susceptibility tests of N. seriolae revealed that all strains were susceptible to doxycycline, oxytetracycline, florfenicol and erythromycin but resistant to amoxicillin and ampicillin. Additionally, a pathogenicity assessment was carried out by administering an intraperitoneal injection of 0.1 mL containing 107 CFU of N. seriolae per fish. The mortality rates observed varied between 40% and 90%, with the P2 strain exhibiting the highest level of virulence, resulting in a cumulative mortality of 90%. Therefore, disease outbreaks in fish can be minimized by developing effective treatments and prevention methods.
- Subjects
TAIWAN; PACIFIC Area; NOCARDIOSIS; MICROBIAL sensitivity tests; FISH farming; FISH ponds; DISEASE outbreaks
- Publication
Journal of Fish Diseases, 2024, Vol 47, Issue 3, p1
- ISSN
0140-7775
- Publication type
Article
- DOI
10.1111/jfd.13894