International Journal of Modern Biological Research
ISSN: 2053-180X
Vol. 2(2), pp. 16-23, June 2014
doi.org/10.33500/ijmbr.2014.2.003



The monogenean community on the gills of Oreochromis niloticus from Melen fish station in Yaounde, Cameroon

TOMBI Jeannette*, AKOUMBA John Francis and BILONG BILONG Charles Félix

Laboratory of Parasitology and Ecology, Faculty of Science, University of Yaounde I, P. O. BOX 812, Yaounde, Cameroon.

*To whom correspondence should be addressed. E-mail: tombijeannette2007@yahoo.fr.

Received 07 May, 2014; Received in revised form 26 May, 2014; Accepted 02 June, 2014.

Abstract


Key words:
Oreochromis niloticus, Monogenea, Gill parasites, Distribution.


The distribution of monogenean gill parasites of 191 specimens of Oreochromis niloticus caught at Melen fish station in Yaounde, Cameroon; between February and July 2012 was investigated. Standard methods of parasitological examination were used for identification of monogenean species. Four parasite species were found, of which, three (Cichlidogyrus thurstonae, C. halli and C. tilapiae) were classified as core species and one (Scutogyrus longicornis) was classified as secondary. All parasites found aggregated within the host population, although one individual fish was without any parasite. Generally, the mean intensities of the different parasite species were very low, except for C. thurstonae, with low mean intensity. From the results obtained, it was observed that parasitism increased with increase in host size but appeared to be sex dependent for S. longicornis only; which was significantly more concentrated in males than in females. The distribution of the parasites in the right side was similar to that of the left side and the colonization of the four pairs of gill arches was done in an anterio-posterior direction.

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