Comparative pathogenicity of Nocardia seriolae in Nile tilapia (Oreochromis niloticus), milkfish (Chanos chanos) and Asian seabass (Lates calcarifer)

Author:

Nazareth Sandra Celenia1ORCID,Cheng Li‐Wu1ORCID,Wang Pei‐Chi234ORCID,Chen Shih‐Chu12345ORCID

Affiliation:

1. Department of Veterinary Medicine National Pingtung University of Science and Technology Pingtung Taiwan

2. College of Veterinary Medicine, Southern Taiwan Fish Diseases Research Centre National Pingtung University of Science and Technology Pingtung Taiwan

3. International Degree Program of Ornamental Fish Technology and Aquatic Animal Health, International College National Pingtung University of Science and Technology Pingtung Taiwan

4. Research Centre for Fish Vaccine and Diseases, College of Veterinary Medicine National Pingtung University of Science and Technology Pingtung Taiwan

5. General Research Service Centre National Pingtung University of Science and Technology Pingtung Taiwan

Abstract

AbstractNocardiosis, caused by Nocardia seriolae, has been a prominent disease in Southeast Asian aquaculture in the last three decades. This granulomatous disease reported in various fish species is responsible for significant economic losses. This study investigated the pathogenicity of N. seriolae in three cultured species in Taiwan: Nile tilapia (omnivore), milkfish (herbivore) and Asian seabass (carnivore). Administration of an infective dose of 1 × 106 CFU/ fish in tilapia, seabass and milkfish demonstrated mortalities of 100%, 90% and 75%, respectively. Additionally, clinical signs namely, granuloma and lesions displayed varying intensities between the groups and pathological scores. Polymerase chain reaction (PCR) amplification specific for N. seriolae was confirmed to be positive (432 bp) using NS1/NG1 primers. Post‐mortem lesions revealed the absence of granulomas in tilapia and milkfish and their presence in the seabass. Interestingly, the gut in tilapia showed an influx of eosinophils suggesting its role during the acute stages of infection. However, post‐challenge, surviving milkfish exhibited granulomatous formations, while surviving seabass progressed toward healing and tissue repair within sampled tissues. Overall, in conclusion, these results demonstrate the versatility in the immunological ability of individual Perciformes to contain this pathogen as a crucial factor that influences its degree of susceptibility.

Funder

Council of Agriculture

National Pingtung University of Science and Technology

Publisher

Wiley

Reference47 articles.

1. Banno J. &Amar E.(1984).The culture of seabass.SEAFDEC Leganes Brackishwater Station Annual Report 1–5.

2. Nocardia species: host-parasite relationships

3. Eosinophils are part of the granulocyte response in tuberculosis and promote host resistance in mice

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