Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/34867
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Prospective Longitudinal Study of Putative Agents Involved in Complex Gill Disorder in Atlantic salmon (Salmo salar)
Author(s): Herrero, Ana
Rodger, Hamish
Hayward, Adam D
Cousens, Chris
Bron, James E
Dagleish, Mark P
Thompson, Kim D
Contact Email: j.e.bron@stir.ac.uk
Keywords: aquatic animals
emerging diseases
pathogens
complex gill disease
Desmozoon lepeophtherii
Paranucleospora theridion
Candidatus Branchiomonas cysticola
salmon gill poxvirus
Neoparamoeba perurans
amoebic gill disease
Issue Date: Aug-2022
Date Deposited: 15-Feb-2023
Citation: Herrero A, Rodger H, Hayward AD, Cousens C, Bron JE, Dagleish MP & Thompson KD (2022) Prospective Longitudinal Study of Putative Agents Involved in Complex Gill Disorder in Atlantic salmon (Salmo salar). <i>Pathogens</i>, 11 (8), Art. No.: 878. https://doi.org/10.3390/pathogens11080878
Abstract: Complex gill disorder (CGD) is an important condition in Atlantic salmon aquaculture, but the roles of the putative aetiological agents in the pathogenesis are uncertain. A longitudinal study was undertaken on two salmon farms in Scotland to determine the variations in loads of CGD-associated pathogens (Desmozoon lepeophtherii, Candidatus Branchiomonas cysticola, salmon gill pox virus (SGPV) and Neoparamoeba perurans) estimated by quantitative PCR. In freshwater, Ca. B. cysticola and SGPV were detected in both populations, but all four pathogens were detected on both farms during the marine stage. Candidatus B. cysticola and D. lepeophtherii were detected frequently, with SGPV detected sporadically. In the marine phase, increased N. perurans loads associated significantly (p < 0.05) with increases in semi-quantitative histological gill-score (HGS). Increased Ca. B. cysticola load associated significantly (p < 0.05) with increased HGS when only Farm B was analysed. Higher loads of D. lepeophtherii were associated significantly (p < 0.05) with increased HGS on Farm B despite the absence of D. lepeophtherii-type microvesicles. Variations in SGPV were not associated significantly (p > 0.05) with changes in HSG. This study also showed that water temperature (season) and certain management factors were associated with higher HGS. This increase in histological gill lesions will have a deleterious impact on fish health and welfare, and production performance
DOI Link: 10.3390/pathogens11080878
Rights: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Licence URL(s): http://creativecommons.org/licenses/by/4.0/

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