Fait partie de [OMB75]

2020 - 172 p.

Summary sheet for viral nervous necrosis

Toffan A.

VNN (viral nervous necrosis) Aetiological agent Betanodavirus Epidemiology Host/s (species; age): All Mediterranean farmed fish: seabass (Dicentrarchus labrax) is the target species, flatfish (Solea spp., Scophthalmus spp.) and groupers (Ephinephelus spp.) are also very susceptible. Seabream (Sparus auratus) and meagre (Argyrosomus regius) appear to be affected only during the larval stage. The younger the fish the more sensitive they are. Morbidity and mortality rates: Depend on age/size class. Larvae up to 100%, juveniles up to 60%, adult fish are more resistant. Survivors remain persistently infected. Transmission: Horizontal as well as vertical (via infected eggs). Factors (environmental, others) for disease outbreak: Clinical signs insurgence is temperature-dependent. Outbreaks often occur at seawater temperatures above 20°C.



Citer cet article    

Toffan A. Summary sheet for viral nervous necrosis . In : Zrncic S. (ed.). Diagnostic Manual for the main pathogens in European seabass and Gilthead seabream aquaculture. Zaragoza : CIHEAM, 2020. p. 148-149. (Options Méditerranéennes : Série B. Etudes et Recherches; n. 75). http://om.ciheam.org/om/pdf/b75/00007950.pdf