Comparative study of different metacercarial infections in two freshwater fishes from Lake Nasser, Nile River and hatcheries at Aswan - Egypt

Saad, A.I.

Journal of the Egyptian-German Society of Zoology, D 51: 107-125

2006


ISSN/ISBN: 1110-5356
Accession: 022242576

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Abstract
In the present survey an attempt was made to, elucidate the prevalence of infections with different metacercarial infections among Oreochromis niloticus niloticus (Linnaeus, 1757) and Tilapia zillii (Gervais, 1848) from three different localities at Aswan Governorate namely: Lake Nasser, Nile River and fish hatcheries. Incidence of infection was higher among Tilapia zillii than Oreochromis niloticus. Regarding to the incidence' of infection in relation to the location, it was found higher in hatcheries than in Lake Nasser and River Nile. Parasitological examination revealed that eight species of metacercariae were found parasitizing fish. These belonged to: 'Prohemistomum 'vivax, Centrocestus sp., two Haplorchis spp., two diplostomatids, Euclinostomum heterostomum and Clinostomum sp. Moreover, the distribution pattern of each species of metacercariae in their hosts was reported. The distribution of such metacercariae may be affected by the parasite behavior as well as the host habitat.