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Articles
by
A. Marques |
Total Records (
1 ) for
A. Marques |
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M. Boungou
,
G.B. Kabre
,
A. Marques
and
L. Sawadogo
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The study of the gill fishes of 176 Oreochromis niloticus
(L.) was undertaken in the dam of Loumbila (Burkina Faso), in order to
obtain the first information on the dynamics of population of the Monogeneans
parasites in a population of wild hosts. These data are essential in the
search for means to avoid the enormous losses that often occur in intensive
pisciculture. This analysis revealed the presence of five species of Monogeneans
(Cichlidogyrus tilapiae, Cichlidogyrus halli, Cichlidogyrus
thurstonae, Cichlidogyrus rognoni and Scutogyrus longicornis).
On the levels of the recorded infestations, these species taken individually
probably do not control the population of Oreochromis niloticus.
In the dam of Loumbila, the fluctuations of parasitic abundances are neither
seasonal nor cyclic. The size either does not have an influence on parasitism.
However, the sex effect was noted with C. halli, the females thus
were more infested than the males. O. niloticus is parasitized
all the year, because the recruitment of these organisms, although relatively
weak, is continuous; this logically results in their accumulation in this
fish. |
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