Authors
Pornpawit Tanpichai, Onanong Charoenwai, Sayamon Srisuwatanasagul, Patharapol Piamsomboon
Published in
Veterinary sciences. Volume 13. Issue 10. Oct 08, 2026. Epub Oct 08, 2026.
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.
PMID:
42944148
Bibliographic data and abstract were imported from PubMed on 27 Oct 2026.
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