Caligus elongatus and Photobacterium damselae subsp piscicida Concomitant Infections Affecting Broodstock European Seabass, Dicentrarchus labrax, with Special Reference to Histopathological Responses
3b-Department of Microbiology and Immunology, Faculty of Veterinary Medicine, Cairo University, Giza Egypt
- *Corresponding Author:
- Elgendy MY
Department of Hydrobiology
National Research Centre
12622 Dokki, Giza, Egypt
E-mail: [email protected]
- Abdelsalam M
Department of Fish Diseases and Management
Faculty of Veterinary Medicine, Cairo University
E-mail: [email protected]
Received Date: March 29, 2015; Accepted Date: April 15, 2015; Published Date: May 25, 2015
Citation: Elgendy MY, Abdelsalam M, Moustafa M, Kenawy AM, Seida A (2015) Caligus elongatus and Photobacterium damselae subsp piscicida Concomitant Infections Affecting Broodstock European Seabass, Dicentrarchus Labrax, with Special Reference to Histopathological Responses. J quac Res Development 6:346. doi:10.4172/2155-9546.1000346
Copyright: ©2015 Elgendy MY, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Caligus elongatus and Photobacterium damsela subsp piscicida are pathogens of serious infections in European seabass, Dicentrarchus labrax. In this study, both agents were concomitantly isolated from moribund broodstock European seabass cultured within the hatchery unit at El-Max Research Station (NIOF), Alexandria governorate, Egypt. Externally, fish were heavily infested with Caligus elongatus ectoparasitic copepods. The overall prevalence, mean intensity and mean abundance of C. elongatus on examined fish were 92.3%, 23.3 and 21.5; respectively. Majority of samples noticed sever haemorrhages on the external body surface and fins. Internally, moribund fish showed characteristic whitish nodules and extensive adhesions of visceral organs. 88.46% of investigated fish were concurrently found to be infected with P. damsela subsp piscicida. No other bacterial species were detected. P. damsela subsp piscicida was also isolated from C. elongatus infesting clinically diseased fish. All P. damsela subsp piscicida isolates were confirmed by sequencing of the16S rRNA gene. Microscopically, multiple granulomas were regularly observed in haemopoietic organs. Our results as a whole indicate that C. elongatus may serve as a potential vector for P. damsela subsp piscicida and possibly enhance photobacteriosis dissemination among cohabitant fish, thus suggesting the desirability of redesigning the protocols presently used for microbial recognition during fish epidemiological studies to improve fish health.