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Prevalence of fish parasites in nile tilapia (Oreochromis niloticus) and African catfish (Clarias gariepinus) and physicochemical characteristics of pond water in Arusha and Morogoro, Tanzania

Research Paper | December 1, 2020

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Frida Nyamete, Musa Chacha, Titus Msagati, Jofrey Raymond

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Int. J. Biosci.17( 6), 76-91, December 2020

DOI: http://dx.doi.org/10.12692/ijb/17.6.76-91


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Fish parasites can cause significant production and economic losses in aquaculture. This study examined 130 small-scale fish ponds in the Arusha and Morogoro regions of Tanzania between December 2019 and February 2020 to determine pond water physicochemical parameters and the prevalence of parasites in farmed Nile tilapia (Oreochromis niloticus) and African catfish (Clarias gariepinus). Most ponds sampled were small (20 ≤ 300 m2) and majorly of concrete. The physicochemical water parameters measured varied between sites and regions. The overall length and weight of fish sampled ranged from 6 to 23 cm (mean 14.4 ± 5.7 cm) and 30 to 412 g (mean 227 ± 124 g). The most and least prevalent parasites were Acanthocephalus sp. (49.2 – 50.7%) and leeches (4.6 – 7.6%). The prevalence of Diplostomum sp. (36.9 – 38. 4%), Dactylogyrus sp. (32.3 – 47.6%), Gyrodactylus sp. (36.9 – 47.6%), Contracaecum sp. (41.5 49.2%), and Trichodina sp. (41.5 – 44.6%) were higher than reported in other parts of East Africa. We recommend awareness of fish health and proper farm management practices to minimize parasitic infection and improve aquaculture in Tanzania.


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