Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/31020
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Environmental conditions influence susceptibility of striped catfish Pangasianodon hypophthalmus (Sauvage) to Edwardsiella ictaluri
Author(s): Phuoc, Nguyen Ngoc
Richards, Randolph
Crumlish, Margaret
Contact Email: margaret.crumlish@stir.ac.uk
Keywords: Edwardsiella ictaluri
Pangasianodon hypophthalmus
Environmental conditions
pH
salinity
Issue Date: 30-Jun-2020
Citation: Phuoc NN, Richards R & Crumlish M (2020) Environmental conditions influence susceptibility of striped catfish Pangasianodon hypophthalmus (Sauvage) to Edwardsiella ictaluri. Aquaculture, 523, Art. No.: 735226. https://doi.org/10.1016/j.aquaculture.2020.735226
Abstract: Over the last 20 years the production farmed Vietnamese striped catfish (Pangasianodon hypophthalmus) has increased significantly and in 2016, over 1.2 million tonnes of catfish were farmed and sold globally. Bacterial disease outbreaks due to Edwardsiella ictaluri continue to be one of the biggest threats to the sector, however, little is known on how the environmental conditions affect the survival of the fish during disease outbreaks. Growth of 14 Edwardsiella ictaluri strains recovered from natural disease outbreaks occurring in 4 provinces in Vietnam between 2002 and 2011 was investigated in vitro under different pH and salt concentrations. The results showed that a pH value of 6.5, NaCl concentration of 0.5% was optimal for the growth of the bacteria in vitro. The effect of varied pH and salt concentrations on the susceptibility of striped catfish to E. ictaluri infection was also studied in vivo following an immersion bacterial challenge (1.1 x 107 cfu ml−1 E. ictaluri for 30 s). The cumulative mortality of striped catfish in water at pH 5.5 and pH 6.5 was significantly higher than that of fish maintained in more alkaline water (p < .05). The cumulative mortality of the striped catfish maintained in 0.5% NaCl was significantly lower than those kept in 0%, 1% and 1.5% NaCl (p < .05). This study identified the effect of pH and salinity changes on the susceptibility of striped catfish to E. ictaluri infections.
DOI Link: 10.1016/j.aquaculture.2020.735226
Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. Accepted refereed manuscript of: Phuoc NN, Richards R & Crumlish M (2020) Environmental conditions influence susceptibility of striped catfish Pangasianodon hypophthalmus (Sauvage) to Edwardsiella ictaluri. Aquaculture, 523, Art. No.: 735226. https://doi.org/10.1016/j.aquaculture.2020.735226 © 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Licence URL(s): http://creativecommons.org/licenses/by-nc-nd/4.0/

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