University of Khartoum

Parasitic and Histopathological Studies on Some Inland Fish Species at Khashm el Girba Reservoir

Parasitic and Histopathological Studies on Some Inland Fish Species at Khashm el Girba Reservoir

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Title: Parasitic and Histopathological Studies on Some Inland Fish Species at Khashm el Girba Reservoir
Author: Muna Mahmoud Mohamed Salih, Salih
Abstract: The present study represented the first systematic approach to evaluate the health status of some economically important fish species in Khash El Girba reservoir. Five fresh water fish species: Oreochromis niloticus, Labeo niloticus, Synodontis schall, Clarias lazera and Alestes baremose were collected at selected sites at Khashm El• Girba Reservoir, and systematically studied during the various seasons of the year. The objective was to monitor the health status of these fish species, and to record the presence and effects of helminth parasites. The presumably normal morphology of some vital organs including the gills, liver, intestines and kidneys pertinent to these fish species were grossly and histologically examined for comparison. However, some histological variations between healthy species were reported in the liver tissues. The histopathological investigations based on the assessment of the presence and effects of adults and larval stages of helminth parasites in different organs of the five fish species. The incidence rate of presence of metacercarial cysts in organs such as hepatopancreas and kidneys was taken as measurement to reflect the magnitude of ill effects caused by some of digenian parasites on fish. Macro- and microscopic examinations revealed two genera of digenetic trematode metacercariae associated with O. niloticus. These were identified previously by Khalil (1971) as Clinostomum tilapiae and Euclinostomum heterostomum. None was recorded in other fish species. The periodical examination of the selected fish species revealed presence of other helminth parasites. Four nematode genera were reported in most of the species of fish. These were adult Procamallnus spp., two types of larval Amplicaecum spp., Contracaecum spp. and Porrocaecum spp. (larvae). In addition, five unidentified larval nematodes were also reported in different fish species. Acanthocephalus parasites were found in only Labeo niloticus. Other fish species were free from these parasites. The prevalence rate, density of infection, morphometric of parasite, organ affected and pathogenicity were studied in more detail with respect to seasonality. However, O. niloticus and S. schall were found to be the most fish species exhibiting parasitic infestation and histopathological changes. The least fish affected was Alestes baremose.
URI: http://khartoumspace.uofk.edu/handle/123456789/13783
Date: 2015-06-22


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