Effect of TDA-producing Phaeobacter inhibens on the fish pathogen Vibrio anguillarum in non-axenic algae and copepod systems

Bastian Barker Rasmussen, Katrine Ege Erner, Mikkel Bentzon-Tilia, Lone Gram*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The expanding aquaculture industry plays an important role in feeding the growing human population and with the expansion, sustainable bacterial disease control, such as probiotics, becomes increasingly important. Tropodithietic acid (TDA)‐producing Phaeobacter spp. can protect live feed, for example rotifers and Artemia as well as larvae of turbot and cod against pathogenic vibrios. Here, we show that the emerging live feed, copepods, is unaffected by colonization of the fish pathogen Vibrio anguillarum, making them potential infection vectors. However, TDA‐producing Phaeobacter inhibens was able to significantly inhibit V. anguillarum in non‐axenic cultures of copepod Acartia tonsa and the copepod feed Rhodomonas salina. Vibrio grew to 106 CFU ml−1 and 107 CFU ml−1 in copepod and R. salina cultures, respectively. However, vibrio counts remained at the inoculum level (104 CFU ml−1) when P. inhibens was also added. We further developed a semi‐strain‐specific qPCR for V. anguillarum to detect and quantify the pathogen in non‐axenic systems. In conclusion, P. inhibens efficiently inhibits the fish larval pathogen V. anguillarum in the emerging live feed, copepods, supporting its use as a probiotic in aquaculture. Furthermore, qPCR provides an effective method for detecting vibrio pathogens in complex non‐axenic live feed systems.
Original languageEnglish
JournalMicrobial Biotechnology
Volume11
Issue number6
Pages (from-to)1070-1079
ISSN1751-7907
DOIs
Publication statusPublished - 2018

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This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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