Fish Productivity Response to Water Quality Variations: A Case Study of Nyumba ya Mungu Dam, in Pangani Water Basin, Tanzania

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dc.contributor.authorMangi, Halima O.
dc.contributor.authorOnywere, Simon M.
dc.contributor.authorKitur, Esther C.
dc.date.accessioned2023-09-06T07:27:50Z
dc.date.available2023-09-06T07:27:50Z
dc.date.issued2023
dc.descriptionarticleen_US
dc.description.abstractFish habitat degradation, such as water pollution due to the rapid expansion of incompatible land uses, is one of the noteworthy challenges to freshwater ecosystems. Elevated contents of nutrients and contaminants in water are some of the imperative challenges. *is research was conducted to investigate the link between water qualities and 3sh productivity in the Nyumba ya Mungu Dam, whose 3shery potential had decreased by 95% between 1972 and 2018. Physicochemical characteristics, namely, temperature, pH, dissolved oxygen (DO), turbidity, total nitrogen, total phosphorus, chlorophyll a, and the water depth of 3shing net location, were assessed following standard procedure. Fish catches per unit e;ort representing 3sh biomass/productivity were monitored for twelve months from January to December 2019. Pearson’s correlation analysis indicated that 3sh catch per unit e;ort was positively and signi3cantly correlated with turbidity (r = 0.461, P < 0.01) and TP (r = 0.405, P < 0.01). Stepwise multiple regression model results indicated that turbidity, dissolved oxygen, and the depth of the 3shing net location are the statistically signi3cant predictors of 3sh catch per unit e;ort which represented 3sh biomass. Findings further indicated that the model combining turbidity and dissolved oxygen predicted a 24% change in 3sh catch per unit e;ort, whereas turbidity, dissolved oxygen, and the depth of 3shing net location contributed a 28.9% change in 3sh catch per unit e;ort. In conclusion, 3sh productivity in the NMD is limited by organic matter availability and nutrient levels that cause algae bloom occurrence. Turbidity is an indicator of organic matter availability and the e;ect of algae bloom on 3sh productivity. InCow of nutrients to the dam nourishes the algae biomass, thus creating vicious cycles on 3sh productivity as 3sh species in the dam failed to take advantage of high primary production by algae.en_US
dc.identifier.citationMangi, H. O., Onywere, S. M., & Kitur, E. C. (2023). Fish productivity response to water quality variations: A case study of nyumba ya mungu dam, in pangani water basin, Tanzania. International Journal of Ecology, 2023.en_US
dc.identifier.otherhttps://doi.org/10.1155/2023/7353898
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/26896
dc.language.isoenen_US
dc.publisherijeen_US
dc.titleFish Productivity Response to Water Quality Variations: A Case Study of Nyumba ya Mungu Dam, in Pangani Water Basin, Tanzaniaen_US
dc.typeArticleen_US
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