title: Structure and dynamics of myxosporean parasites component communities in two freshwater Cichlids in the Chari River (Republic of Chad).
abstract: Myxosporean parasites of two freshwater Tilapia species from the Chari River, Chad Republic, Oreochromis niloticus and Sarotherodon galilaeus, were investigated from November 2001 to October 2002. A total of 360 specimens per Cichlid species were examined. Eleven parasite species were found in both cases with different prevalences. Myxobolus agolus, M. brachysporus, M. clarii, M. cichlidarum, M. heterosporus, M. tilapiae and M. camerounensis in O. niloticus) appeared common while M. equatorialis, M. nyongana (and M. camerounensis in S. galilaeus) were secondary; lastly M. israelensis (and M. kainjiae in O. niloticus) were rare. The gills, fins, eyes and teguments were preferential locations of cysts building pathogens while the kidneys then the gall bladder were most commonly infected by myxosporean spores. In the Chari ecosystem, no significant host sex and size effects were found for the parasite cystic load. A clear seasonal occurrence was observed for most of these pathogens. In the view of pathogenic control, this study raised the necessity in a farm fish station to identify the most important myxosporean species and the period of their potential demographic explosion.
authors.affiliation: Département de Biologie (FSEA), Université de Ndjamena, BP 1117 Ndjamena (Tchad).
authors.forename: Abakar
authors.initials: A
authors.lastname: Ousman
authors.forename: Bilong Bilong Charles
authors.initials: BB
authors.lastname: Félix
authors.forename: Njiné
authors.initials: N
authors.lastname: Thomas
authors.forename: Fomena
authors.initials: F
authors.lastname: Abraham
mesh_terms: D000818:Animals; D002596:Chad; D023681:Cichlids / Q000469:parasitology*; D005260:Female; D005618:Fresh Water; D008297:Male; D055764:Myxozoa / Q000145:classification / Q000302:isolation & purification*; D013045:Species Specificity