Data/hora: 26/06/2024 11:38:29

Biblioteca(s): 	Epagri-Sede.	
Data corrente: 	29/08/2017	
Data da última atualização: 	29/08/2017	
Autoria: 	TANCREDO, K. R.; MARCHIORI, N. C.; FURTADO, W. E.; MARTINS, M. L.	
Título: 	Prevalence of monogenean species in Oreochromis niloticus from southern Brazil.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	In: INTERNATIONAL SYMPOSIUM ON MONOGENEA, 8., 2017, Brno, Czech Republic. Abstracts... Brno, Czech Republic: ISM, 2017. p. 133	
Idioma: 	Inglês	
Conteúdo: 	Due to its species richness, ubiquity and epizootic potential, monogenean parasites are
considered one of the most important in captive fish breeding, including Nile tilapia
Oreochromis niloticus whose association, not rarely, results in significant economic losses
due to high mortality rates. Among the studies necessary for the elaboration of control
strategies for the group, there is a highlight for parasitology. Therefore, the knowledge of
their indices and forms of distribution are fundamental. The aim of this study was to report
the prevalence of monogenean species in the gills and stomach of O. niloticus collected in
the southern Brazil. A total of 55 fish (weight of 21.65 ± 12.62 g, total length of 10.97 ±
1.92 cm) were collected from a fish farm in earthen pond and transported alive to the Aquatic
Organisms Health Laboratory (AQUOS) of the Federal University of Santa Catarina
(UFSC). 24 h after acclimation period, the fish were anesthetized with eugenol (75 mg / L)
and euthanized by cerebral commotion.The gill arches were removed, bathed in hot water
(55°C) and fixed in 70% ethanol for further quantification and identification. With the help
of a stereomicroscope, all Monogenea specimens were mounted in Hoyer's and identified
according to specialized literature. Prevalence indices were calculated according to Bush et
al. (1997). A total of 93 parasites specimens were found, with the highest prevalence
reported for Cichlidogyrus sclerosus Prince and Kirk, 1967 (61%), followed by C. tilapiae
Paperna, 1960 (16%), C. dossoui Döuellou, 1993 (10%) Enterogyrus cichlidarum Paperna,
1963 (8%), C. halli Prince and Kirk, 1967 (4%) and Scutogyrus longicornis Paperna and
Thurston, 1969 (1%). Parasitism by monogenean is common in fish farms around the world.
Therefore, in order to contain economic losses caused by massive mortalities, cultivation
environments must provide adequate water quality conditions in order to avoid eutrophic
water with excess of organic matter and favorable to the proliferation and spread of these
parasites. In a study conducted by Lerssutthichawal Theerawoot in Thailand with
O. niloticus a total of seven species of monogenean were identified from cyprinid and clariid
fish. In the state of Santa Catarina, southern region of Brazil, E. cichlidarum was reported
parasitizing the stomach of cultured tilapia for the first time in 2007. In the same region and
culture conditions, specimens of C. sclerosus, C. halli, C. thurstonae Ergens, 1981,
C. tilapiae and S. longicornis were found parasitizing the gills of O. niloticus. Parasitic
surveys already carried out in fish farms in this region have shown that C. sclerosus is
commonly the most prevalent species of the genus, corroborating with the results obtained
here. In the present study, nine specimens of C. dussoui were found parasitizing the gills of
O. niloticus grown in earthen ponds. C. dossoui has a wide geographic distribution and host
specificity, and has been reported so far in nine different cichlid species and six countries,
none of them in South America. Therefore, this work is the first record of this species in
Brazil and, consequently, in the South American continent.	
Palavras-Chave: 	Monogenea.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
URL: 	http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_39705.pdf	
Registro original: 	Epagri-Sede (Epagri-Sede)	
Exemplares: 	Epagri-Sede - (101582-1) - UPC - PL - DD -  -  -  - DIS