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Peer-reviewedCC BYVeterinary sciences

Chronic Erosive Dermatopathy (CED) Associated with Ectoparasite Infestation in Nile Tilapia Post-Larvae (Oreochromis niloticus Linnaeus, 1758).

  • Pornpawit Tanpichai1
  • Onanong Charoenwai2
  • Sayamon Srisuwatanasagul3
  • Patharapol Piamsomboon4
4 affiliations
  1. 1Aquatic Animals Clinic, Faculty of Veterinary Medicine, Mahanakorn University of Technology, Bangkok 10530, Thailand.
  2. 2Graduate Program in Veterinary Science and Technology (VST) International Program, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand.
  3. 3Department of Anatomy, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand.
  4. 4Department of Veterinary Medicine, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand.
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Abstract

Chronic erosive dermatopathy (CED) associated with ectoparasites was investigated in Nile tilapia (Oreochromis niloticus). Between 2023 and 2024, craniofacial lesions occurred at a prevalence of <1% across culture stages. Histopathology showed epidermal goblet cell proliferation and disappearance of the muscular layer, with no active pathogens or inflammation. Clinical history indicated heavy ectoparasite infestations during the 0.1 g fry stage, supported by parasite remnants found in deep skin scrapes of CED lesions. A clinical trial assessed this link using 3000 post-larvae (0.01 g each), divided into a control group (untreated) and a treatment group (tank water disinfected with 75% chlorine powder to 15 ppm for 24 h before stocking). Sampling 30 fish weekly for three weeks revealed CED incidence rates of 30% (9/30), 40% (12/30), and 27% (8/30) in controls, whereas the treatment group developed no lesions. The odds of developing CED were 25.7-, 40.0-, and 21.8-fold higher in controls at weeks 1, 2, and 3, respectively. These findings suggest early-stage ectoparasite infestations contribute to CED development. Implementing strict sanitary measures from post-larval stages is essential to minimize prevalence.

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Cite

BibTeXRIS
BibTeX
@article{tanpichai2026chronic,
  title = {{Chronic Erosive Dermatopathy (CED) Associated with Ectoparasite Infestation in Nile Tilapia Post-Larvae (Oreochromis niloticus Linnaeus, 1758).}},
  author = {Pornpawit Tanpichai and Onanong Charoenwai and Sayamon Srisuwatanasagul and Patharapol Piamsomboon},
  journal = {Veterinary sciences},
  year = {2026},
  month = oct,
  doi = {10.3390/vetsci13101052},
  url = {https://europepmc.org/article/MED/42944148},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Chronic Erosive Dermatopathy (CED) Associated with Ectoparasite Infestation in Nile Tilapia Post-Larvae (Oreochromis niloticus Linnaeus, 1758).
AU  - Pornpawit Tanpichai
AU  - Onanong Charoenwai
AU  - Sayamon Srisuwatanasagul
AU  - Patharapol Piamsomboon
PY  - 2026
DA  - 2026/10/08
JO  - Veterinary sciences
DO  - 10.3390/vetsci13101052
UR  - https://europepmc.org/article/MED/42944148
AB  - Chronic erosive dermatopathy (CED) associated with ectoparasites was investigated in Nile tilapia (Oreochromis niloticus). Between 2023 and 2024, craniofacial lesions occurred at a prevalence of <1% across culture stages. Histopathology showed epidermal goblet cell proliferation and disappearance of the muscular layer, with no active pathogens or inflammation. Clinical history indicated heavy ectoparasite infestations during the 0.1 g fry stage, supported by parasite remnants found in deep skin scrapes of CED lesions. A clinical trial assessed this link using 3000 post-larvae (0.01 g each), divided into a control group (untreated) and a treatment group (tank water disinfected with 75% chlorine powder to 15 ppm for 24 h before stocking). Sampling 30 fish weekly for three weeks revealed CED incidence rates of 30% (9/30), 40% (12/30), and 27% (8/30) in controls, whereas the treatment group developed no lesions. The odds of developing CED were 25.7-, 40.0-, and 21.8-fold higher in controls at weeks 1, 2, and 3, respectively. These findings suggest early-stage ectoparasite infestations contribute to CED development. Implementing strict sanitary measures from post-larval stages is essential to minimize prevalence.
SN  - 2306-7381
ER  -