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Exuberant granulation tissue response associated with Neobenedenia sp. (Monogenea: Capsalidae) infestation in two
J Hurley-Sanders1, C Harms1,2,3, E Christiansen1,3,4
1Environmental Medicine Consortium, North Carolina State University, Raleigh, NC, USA.
Monogenean parasites commonly affect captive fish gills. This study details an unusual case of excessive granulation tissue in cobia gills, suspected to be caused by Neobenedenia infestation.
Area of Science:
- Marine biology
- Ichthyology
- Aquatic veterinary medicine
Background:
- Monogenean parasites are prevalent ectoparasites in marine fish aquaculture.
- These parasites typically infest the skin and gills of teleosts.
- Early detection and treatment are crucial for managing parasite outbreaks.
Observation:
- Two captive cobia (Rachycentron canadum) presented with significant gill pathology.
- Exuberant granulation tissue formation was observed on the gill surfaces.
- The clinical signs were atypical for common monogenean infections.
Findings:
- Neobenedenia spp. infestation was suspected as the causative agent.
- The granulation tissue may represent an aberrant host response to chronic irritation.
- This presentation highlights unusual host-parasite interactions in aquaria.
Implications:
- Understanding atypical host responses is vital for diagnosing and managing fish diseases.
- Aquarium biosecurity and parasite surveillance protocols may need refinement.
- Further research into Neobenedenia pathogenesis in cobia is warranted.
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