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Summary sheet for Aeromonas spp infections Smyrli M., Katharios P. in

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Summary sheet for Aeromonas spp infections

Smyrli M., Katharios P.

in

Zrncic S. (ed.).

Diagnostic Manual for the main pathogens in European seabass and Gilthead seabream aquaculture

Zaragoza : CIHEAM

Options Méditerranéennes : Série B. Etudes et Recherches; n. 75 2020

pages 158-159

Article available on line / Article disponible en ligne à l’adresse :

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http://om.ciheam.org/article.php?IDPDF=00007955

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To cite this article / Pour citer cet article

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Smyrli M., Katharios P. Summary sheet for Aeromonas spp infections. In : Zrncic S. (ed.). Diagnostic Manual for the main pathogens in European seabass and Gilthead seabream aquaculture. Zaragoza : CIHEAM, 2020. p. 158-159 (Options Méditerranéennes : Série B. Etudes et Recherches; n. 75)

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http://www.ciheam.org/

http://om.ciheam.org/

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Options Méditerranéennes, B no. 75, 2020

158

Summary sheet for Aeromonas spp infections

M. Smyrli and P. Katharios1

1 Hellenic Centre for Marine Research, Institute of Marine Biology, Biotechnology and Aquaculture (IMBBC), Heraklion Crete, Greece.

Aetiological agent/s

A. veronii bv. sobria, A. hydrophila and A. salmonicida

Epidemiology

Host/s (species; age): European seabass (Dicentrarchus labrax) mainly affected; juvenile and grown fish. Also isolated in mixed infections from various diseased fish e.g. gilthead seabream (Sparus aurata), sharpsnout seabream (Diplodus puntazzo), common pandora (Pagellus erythrinus) and common dentex (Dentex dentex).

Morbidity and mortality rates: Variability among cases. Generally, low daily mortality (0.5- 1%). Cumulative mortality during outbreaks may reach 20%. Long term, cumulative mortality of affected fish may reach 80%.

Transmission: Horizontal

Factors (environmental, others) for disease outbreak: Outbreaks often occur at seawater temperature > 21oC. Also, stress induced; from sudden deterioration of environmental conditions or transportation of fish.

Clinical signs

Lethargy and loss of appetite. Icteric (yellowish) appearance and internal haemorrhages in the case of A. veronii bv. sobria. Darkening of fish colouration, haemorrhagic spots and/or ulcerative lesions. Internally, enlargement of the spleen is common among different

Aeromonas spp. infections. Multiple abscesses on spleen, liver and kidney in fish affected by A. veronii bv. sobria and A. salmonicida subsp. masoucida/ achromogenes.

Samples to be collected for diagnostics

Moribund whole fish. Target organs for microbiology/histology: the kidney and spleen.

Presumptive diagnostics analysis

Disease signs and/or mortality of fish vaccinated for vibriosis and photobacteriosis. History of elevated water temperature or stress factors. Low daily or sudden high mortality.

Splenomegaly.

Bacterial cultures fully grown on TSA 2% NaCl at 48h, 25oC. No growth on mediums supplemented with 4% NaCl. Resistance to the vibriostatic agent O/129 and ampicillin.

Generally, no or limited growth on TCBS. Biochemical diagnostic kits may identify up to genus level.

Confirmatory diagnostic analysis PCR (ISR, GCAT, gyrB, rpoD)

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Diagnostic Manual for the main pathogens in European seabass

and Gilthead seabream aquaculture

159

Enlarged spleen with multiple abscesses, A. veronii-European seabass

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