Parasitic fauna and histopathology of farmed freshwater ornamental fish in Brazil

Publication date: 1 March 2017
Source:Aquaculture, Volume 470
Author(s): Monyele Acchile Santos, Gabriela Tomas Jerônimo, Lucas Cardoso, Karen Roberta Tancredo, Paula Brando Medeiros, José Victor Ferrarezi, Eduardo Luiz Tavares Gonçalves, Guilherme da Costa Assis, Maurício Laterça Martins
Ornamental fish farming represents a consolidated market over the world. However, confinement is a factor that favors the occurrence of diseases. This study aimed to report the parasitic fauna of ornamental fish from three facilities, as well as to observe the histological pathogenesis caused by the parasites. Between May 2015 and February 2016, a total of 781 ornamental fishes were used for parasitological and histopathological analysis. Water quality was measured in fishponds from each facility. Ciliate protozoans Ichthyophthirius multifiliis; Trichodina sp.; the monogeneans Dactylogyrus extensus, D. minutus and Diaphorocleidus kabatai; metacercariae of the digeneans; the cestode Bothriocephalus acheilognathi; the nematode Rhabdochona sp.; and the branchiuran Argulus japonicus were found in the examined fish. The greatest prevalence and mean intensity was observed in the gills of Gymnocorymbus ternetzi parasitized by D. kabatai, followed by the protozoan parasite I. multifiliis on the body surface of Xiphophorus maculatus. Histopathological analysis showed epithelial interlamellar hyperplasia of the secondary lamellae, partial fusion of the secondary lamellae, telangiectasia, justalamellar edema and eosinophilic inflammatory infiltrate. The intestine of cestode parasitized fish showed necrosis in the submucosa, intestinal obstruction and lymphoeosinophilic inflammatory infiltrate. It is important to know the parasitic fauna of farmed fish and the pathogenesis caused by the parasites in order to ensure fish production and the health of the hosts. Statement of relevance Ornamental fish production as a consolidate activity around the world faces problems of parasite infection leading to fish mortality and economic losses. To ensure farming production, it is important to monitor the status of fish health. Parasitic fauna and histopathological analysis are used as important tools for the diagnosis of tissue lesions.

Glossaire technique

Elevage commercial d'animaux marins ou d'eau douce et de plantes...
Les bothriocéphales sont des cestodes (vers plats) parasites exclusifs des...
Manifestation pathologique due à l'action des microbes.
Partie du tube digestif, de la sortie de l'estomac à l'anus.
Organisme qui vit aux dépens d'un autre organisme et qui est souvent...