%0 Journal Article
%T Impact of Lernaea cyprinacea Linnaeus 1758 (Crustacea : Copepoda) almost a decade after an initial parasitic outbreak in fish of Malilangwe Reservoir, Zimbabwe Impact de la Lernaea cyprinacea (Crustacea : Copepoda) pr¨¨s d¡¯une d¨¦cennie apr¨¨s une premi¨¨re ¨¦pid¨¦mie parasitaire chez les poissons du r¨¦servoir Malilangwe, Zimbabwe
%A Dalu T.
%A Nhiwatiwa T.
%A Clegg B.
%A Barson M.
%J Knowledge and Management of Aquatic Ecosystems
%D 2012
%I EDP Sciences
%R 10.1051/kmae/2012020
%X An assessment was carried out on the impact of Lernaea cyprinacea on fish populations ten years after its first outbreak in the Malilangwe reservoir, and Lernaea cyprinacea is currently showing no sign of declining in the reservoir. Eight fish species were examined for ectoparasite prevalence and intensity. The possible relationship between L. cyprinacea infestation and environmental factors were investigated. Two parasite species, L. cyprinacea in Oreochromis mossambiccus, Oreochromis placidus, Oreochromis macrochir, Labeo altivelis and Tilapia rendalli and trematode cysts (Clinostomoides brieni) in Clarias gariepinus were found. Lernaea cyprinacea prevalence was 100% amongst all cichlids but varied for L. altivelis. Parasite intensity increased during the cool, dry season (May to July), with the greatest mean intensity being observed amongst the cichlids. There was a significant relationship between parasite intensity and environmental factors; dissolved oxygen (p < 0.05), temperature (p < 0.001) and pH (p < 0.001). Une ¨¦valuation a ¨¦t¨¦ r¨¦alis¨¦e sur l¡¯impact de Lernaea cyprinacea sur les populations de poissons dix ans apr¨¨s sa premi¨¨re apparition dans le r¨¦servoir Malilangwe. Lernaea cyprinacea ne montre actuellement aucun signe de d¨¦clin dans le r¨¦servoir. Huit esp¨¨ces de poissons ont ¨¦t¨¦ examin¨¦es pour la pr¨¦valence et l¡¯intensit¨¦ des ectoparasites. La relation possible entre l¡¯infestation de L. cyprinacea et les facteurs environnementaux a ¨¦t¨¦ ¨¦tudi¨¦e. Deux esp¨¨ces de parasites, L. cyprinacea dans Oreochromis mossambiccus, Oreochromis placidus, Oreochromis macrochir, Labeo altivelis et Tilapia rendalli et les kystes de tr¨¦matode (Clinostomoides brieni) dans Clarias gariepinus ont ¨¦t¨¦ trouv¨¦s. La pr¨¦valence de Lernaea cyprinacea ¨¦tait de 100 % chez tous les cichlid¨¦s, mais variable pour L. altivelis. L¡¯intensit¨¦ parasitaire a augment¨¦ au cours de la saison fra che et s¨¨che (de mai ¨¤ juillet) avec une intensit¨¦ moyenne plus grande observ¨¦e parmi les cichlid¨¦s. Il y avait une relation significative entre l¡¯intensit¨¦ du parasite et des facteurs environnementaux; oxyg¨¨ne dissous (p < 0,05), la temp¨¦rature (p < 0,001) et le pH (p < 0,001).
%K Lernaea cyprinacea
%K Clinostomoides brieni
%K parasite
%K cichlids
%K intensity
%K Malilangwe
%K Lernaea cyprinacea
%K Clinostomoides brieni
%K parasite
%K cichlid¨¦s
%K pr¨¦valence
%U http://dx.doi.org/10.1051/kmae/2012020