Seasonal occurrence of metazoan parasites in Tigerfish, Hydrocynus vittatus Castelnau, 1861 (Characiformes: Alestidae) from Sanyati Basin, Lake Kariba, Zimbabwe
| Autor: | Maxwell Barson, Annemariè Avenant-Oldewage, Nyasha Mabika, Cobus van Dyk |
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| Rok vydání: | 2019 |
| Předmět: |
Zimbabwe
Wet season Gill Parasitic Diseases Animal Population Dynamics prevalence 030231 tropical medicine Cestoda Zoology Pentastomida Characiformes 030308 mycology & parasitology Copepoda Fish Diseases Annulotrema 03 medical and health sciences 0302 clinical medicine Hydrocynus vittatus Helminths Animals cestode Contracaecum Original Research 0303 health sciences lcsh:Veterinary medicine General Veterinary Alestidae biology aggregation Aquatic animal General Medicine biology.organism_classification Lakes Lamproglena Larva lcsh:SF600-1100 Seasons Helminthiasis Animal Monogenea |
| Zdroj: | Onderstepoort Journal of Veterinary Research, Volume: 86, Issue: 1, Pages: 1-8, Published: 2019 Onderstepoort Journal of Veterinary Research, Vol 86, Iss 1, Pp e1-e6 (2019) The Onderstepoort Journal of Veterinary Research |
| ISSN: | 2219-0635 0030-2465 |
| DOI: | 10.4102/ojvr.v86i1.1659 |
| Popis: | Lake Kariba is a tropical lake with slight variations in seasonal temperature. Temperature is an important physical variable in the biology of both fish and their parasites. Currently, there is no information on the seasonal occurrence of fish parasites in Lake Kariba. The objective of this study was to investigate the seasonal occurrence of metazoan parasites in Hydrocynus vittatus in Lake Kariba, Zimbabwe. Twenty fish specimens were collected by seine netting per season between October 2014 and July 2015 in the Sanyati Basin, Lake Kariba, and examined for metazoan parasites. Mean water temperatures ranged from 24.1 °C to 31.2 °C with slight variations between the seasons. Metazoan parasites consisting of Monogenea ( Annulotrema pikei, Annulotrema pseudonili, Annulotrema bracteatum ), Nematoda ( Contracaecum larvae), Copepoda ( Lamproglena hemprichii ), Cestoda (larval cestodes, Ichthybothrium sp.) and Pentastomida (pentastomid larvae) were recorded. Larval cestodes were recorded in autumn and spring, while pentastome larvae were recorded in summer and spring. The Ichthybothrium sp. was recorded once in winter. Annulotrema pikei and A. pseudonili were observed on the gills and A. bracteatum on both the gills and the skin. Contracaecum larvae, L. hemprichii and A. bracteatum (from the skin) were recorded in all the seasons, with slight variations in prevalence, mean abundance and mean intensity. However, these variations were not statistically significant (analysis of variance or ANOVA, p > 0.05). The slight variations in occurrence of the parasites were probably because of the thermal stability of the lake where variation in temperature was small between seasons. Both A. bracteatum and Contracaecum larvae were aggregated on the fish host, whereas L. hemprichii exhibited a random distribution. Parasite diversity was at its highest during winter. |
| Databáze: | OpenAIRE |
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