Abstract
Bacterial diseases are a major constraint in aquaculture, especially in larviculture. Antibiotics that
can control pathogens should be avoided due to risk of antibiotic resistance. We have shown in
axenic systems of live larval feed that marine Roseobacter clade bacteria can antagonize fish
pathogens and improve survival of fish larvae. Both pathogens and probionts are likely affected by
the natural microbiota, and the purpose of this study was to determine if the probionts would be
effective in non-axenic systems.
The growth and interaction of pathogen (Vibrio anguillarum) and probionts (Phaeobacter inhibens)
were studied in an Artemia and a Dunaliella tertiolecta challenge setup, and a controlled
microbiota of four bacteria isolated from aquaculture was added. P. inhibens grew well in Artemia
and D. tertiolecta cultures, also with a background microbiota. V. anguillarum was decreased
markedly (up to four log units) by P. inhibens irrespective in presence of background microbiota.
In aquaculture, the live feed is a well-known potential entry and propagation point for the fish
pathogens and, hence adding the probiont at this stage would be a logical stage of introduction.
This study demonstrates that probiotic bacteria can be introduced at the stage of live feed and
have a pathogen reducing effect in both an Artemia and a D. tertiolecta challenge setup. This can
potentially limit the subsequent use of antibiotics for control of pathogenic bacteria.
Original language | English |
---|---|
Title of host publication | The Danish Microbiological Society Annual Congress 2015 : Programme & Abstracts |
Publication date | 2015 |
Pages | 74-74 |
Publication status | Published - 2015 |
Event | The Danish Microbiological Society Annual Congress 2015 - Eigtved's Pakhus, Copenhagen, Denmark Duration: 9 Nov 2015 → 9 Nov 2015 |
Conference
Conference | The Danish Microbiological Society Annual Congress 2015 |
---|---|
Location | Eigtved's Pakhus |
Country/Territory | Denmark |
City | Copenhagen |
Period | 09/11/2015 → 09/11/2015 |