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Mass mortality of Nile tilapia caused by co-infection with Enterogyrus spp. (Monogenea: Ancyrocephalinae) and Aeromonas jandaei following transport stress
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  • Inácio Mateus Assane,
  • Karen Dayana Prada-Mejia,
  • Sílvia Umeda Gallani,
  • Natasha Fernandes Weiser,
  • Gustavo Moraes Ramos Valladão,
  • Fabiana Pilarski
Inácio Mateus Assane

Corresponding Author:[email protected]

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Karen Dayana Prada-Mejia
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Sílvia Umeda Gallani
Nilton Lins University
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Natasha Fernandes Weiser
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Gustavo Moraes Ramos Valladão
Nilton Lins University
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Fabiana Pilarski
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Monogenean infection of the internal organs is extremely rare when compared to external infections. This study describes mass mortality of Nile tilapia (Oreochromis niloticus L.) originating from co-infection with Enterogyrus spp. and Aeromonas jandaei following transport stress. The first fish deaths occurred on day 1 post-transport, while cumulative mortality reached approximately 90% by day 10 post-stocking. An atypical amount of pale (whitish) faeces floating on the surface of the water as well as typical clinical signs of motile Aeromonas septicemia, were reported. Adult monogeneans and countless eggs of monogeneans were found in the stomachs and the intestines of both moribund and dead fish, respectively. Two strains of A. jandaei were isolated from the kidneys. Scanning electron microscope microphotographs of the stomach revealed the presence of numerous monogeneans penetrating deep into the gastric tissue, and diffuse lesions filled with bacilliform bacteria. This is the first report of co-infection by Enterogyrus spp. and A. jandaei in Nile tilapia and the first report of E. coronatus, E. foratus, and E. malbergi parasitizing tilapia in Brazil. These findings indicate that synergic co-infection by Monogenean stomach parasites (E. coronatus, E. foratus, and E. malbergi) and A. jandaei may induce high mortalities in tilapia following transport stress.
08 Apr 2021Submitted to Transboundary and Emerging Diseases
09 Apr 2021Submission Checks Completed
09 Apr 2021Assigned to Editor
14 Apr 2021Reviewer(s) Assigned
28 Jun 2021Review(s) Completed, Editorial Evaluation Pending
28 Jun 2021Editorial Decision: Revise Major
06 Jul 20211st Revision Received
06 Jul 2021Submission Checks Completed
06 Jul 2021Assigned to Editor
17 Jul 2021Reviewer(s) Assigned
26 Jul 2021Review(s) Completed, Editorial Evaluation Pending
29 Jul 2021Editorial Decision: Revise Minor
30 Jul 20212nd Revision Received
30 Jul 2021Submission Checks Completed
30 Jul 2021Assigned to Editor
10 Aug 2021Reviewer(s) Assigned
16 Aug 2021Review(s) Completed, Editorial Evaluation Pending
17 Aug 2021Editorial Decision: Accept