World Aquaculture Society Meetings


Your browser does not support the most current secure communications protocol. The World Aquaculture Society is committed to the security of your private information. In order to accept credit card data on this site we are recquired to be in compliance with Payment Card Industry (PCI) standards. Current PCI standards will not allow us to accept traffic from browsers that do not support TLS 1.2 after June 30, 2018. We are alerting you to the important need to update your browser. Changes to our web server made on or before June 30, 2018 will make unavailable with the browser you are currently using. [More..]

Add To Calendar 29/04/2016 09:30:0029/04/2016 09:50:00Africa/JohannesburgAsian-Pacific Aquaculture 2016histopathological changes in maRINE FISH WITH NATURALLY OCCURING VIRAL INFECTION   Crystal 4The World Aquaculture Societyjohnc@was.orgfalseanrl65yqlzh3g1q0dme13067DD/MM/YYYY


Azila, A.*, Norazila, J., Zamri-Saad, M. and Siti Zahrah, A.
 National Fish Health Research Centre, Batu Maung, 11960 Penang, Malaysia

Aquaculture industry in Malaysia is expanding rapidly, producing approximately 526,507 tonnes with estimated wholesale value of RM 3 billion (DoF, 2011). Of this, about 25,374 tonnes of fish were from marine aquaculture cages, with estimated wholesale value of RM 558 million. However, intensification and commercialization of aquaculture industry lead to disease problems caused by bacteria, viruses, parasites and fungi (Bondad-Reantaso et al., 2005). This report describes the histopathological lesions associated with naturally occuring viral infection in fish kept in open-sea cage culture.

A marine fish farm practicing open-sea cage culture system with history of high rate of mortality was selected. A one-year epidemiology study was conducted between February 2014 and January 2015 to determine the prevalence of both bacterial and viral infections involving 3 main cultured species; tiger grouper (Epinephelus fuscoguttatus), Crimson snapper (Lutjanus sp.) and sea bass (Lates calcarifer). Sick fish were collected at monthly intervals for virology and histopathology examinations. Major clinical signs included exophthalmia and abnormal swimming pattern. Internal organs showed enlarged and congested kidney and spleen, and soft and watery brain. Laboratory results revealed either betanodavirus or iridovirus infection. Histological examinations revealed haemorrhagic lesions in the spleen, particularly in the red pulp (Fig.1) and necrosis of the kidneys due to iridovirus infection. Focal encephalitis involving mononuclear cells was often observed following betanodavirus infection (Fig. 2). In conclusion, iridovirus infection involved spleen and kidneys while betanodavirus involved brain tissue.

Copyright © 2001-2018 World Aquaculture Society All Rights Reserved.