Volume : II, Issue : XI, December - 2012 A PRELIMINARY REPORT ON THE ECOLOGICAL INTERACTION BETWEEN GYRODACTYLUS RYSAVYI AND MACROGYRODACTYLUS CONGOLENSIS, VIVIPAROUS GYRODACTYLID MONOGENEANS FROM THE SKIN AND FINS OF THE NILE CATFISH CLARIAS GARIEPINUS![](ArticleImage/No_Image.jpg) AHMED M. EL-NAGGAR Published By : Laxmi Book Publication Abstract : A preliminary report has been given of the ecological interaction between two
cohabitant viviparous gyrodactylid monogeneans, namely Gyrodactylus rysavyi Ergens,
1973 and Macrogyrodactylus congolensis (Prudhoe, 1957) Yamaguti, 1963, skin
dwellers of the Nile catfish Clarias gariepinus. These monogeneans are very highly host
specific and occupy a definite niche on the catfish host. They showed considerable
morphological, ecological and behavioural variations. The small-sized G. rysavyi is a
fast-growing species and attains a high reproductive potential. In contrast, the
cohabitant, large-sized M. congolensis is a slow-growing species and attains a
comparatively lower reproductive potential. While the attachment of M. congolensis is
highly destructive to the niche, the footprint of G. rysavyi is less destructive. On the feral
catfish population, these monogeneans typically survive at low prevalence, mean
intensity and abundance, and tend to aggregate in restricted niches, namely the dorsal
surface of the head region. In all experimental bispecific monogenean infestation trials,
G. rysavyi outnumbered its rival, M. congolensis. However, in all monospecific
monogenean infestation trials, each species exhibited an exponential growth followed by
a dramatic decline and eventual disappearance from the catfish host population. The
proximate and ultimate causes as well as the consequences of the ecological interaction
between G. rysavyi and M. congolensis are discussed in detail. Keywords : Article : Cite This Article : AHMED M. EL-NAGGAR, (2012). A PRELIMINARY REPORT ON THE ECOLOGICAL INTERACTION BETWEEN GYRODACTYLUS RYSAVYI AND MACROGYRODACTYLUS CONGOLENSIS, VIVIPAROUS GYRODACTYLID MONOGENEANS FROM THE SKIN AND FINS OF THE NILE CATFISH CLARIAS GARIEPINUS. Indian Streams Research Journal, Vol. II, Issue. XI, http://oldisrj.lbp.world/UploadedData/1768.pdf References : - Anttila, P.; Romakkaniemi, A. Kuusela, J. and Koski, P. (2008). Epidemiology of Gyrodactylus salaris (Monogenea) in the River Tornionjoki, a Baltic wild salmon river. Journal of Fish Diseases, 31 (5): 373–382.
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