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Evaluation of novel PCR-based method to assess gill injuries in fish caused by the cnidarian Ectopleura larynx
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Evaluation of novel PCR-based method to assess gill injuries in fish caused by the cnidarian Ectopleura larynx
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Journal Article
Evaluation of novel PCR-based method to assess gill injuries in fish caused by the cnidarian Ectopleura larynx
2024
Overview
Gill disease is a major threat to aquaculture of Atlantic salmon, with an unknown and likely underestimated contribution from cnidarians such as jellyfish and biofouling hydroids. To better understand the risk and thus enable mitigation, technology for the certain identification of cnidarian-related gill damage is needed. We used the hydroid
Ectopleura larynx
in a case study to determine whether the exposure of salmon to nematocyst-bearing hydrozoans can be deducted via non-destructive PCR-based methods. In a field experiment, we evaluated (i) whether swabbing the inside of the gill operculum in farmed
Salmo salar
and subsequent PCR analysis can provide quantifiable information about the presence of
E. larynx
material in the gill chamber and, if so, (ii) whether the screening results correlate with histological assessments of gill damage.
The developed PCR methods were able to detect the presence of biofouling hydroids in ambient water. However, despite exposure to suspended hydroid particle concentrations that did result in gill damage in some salmon, quantitative PCR results did not correlate with histological gill assessments. For opercular swabs to serve as a diagnostic tool for detecting biofouling-mediated gill damage in live salmon, increased specificity of genetic markers and improved sampling methods are needed.
Animal trial permit no. 24252 (granted 06.07.2020, Norwegian Food Safety Authority).
Publisher
Springer International Publishing,Springer Nature B.V
Subject
