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.contributor.author
dc.date.accessioned2024-06-20T08:37:24Z
dc.date.available2024-06-20T08:37:24Z
dc.date.issued2023-07-24
dc.descriptionDessertation
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. Tis research was conducted to investigate the link between water qualities and fsh productivity in the Nyumba ya Mungu Dam, whose fshery 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 fshing net location, were assessed following standard procedure. Fish catches per unit efort representing fsh biomass/productivity were monitored for twelve months from January to December 2019. Pearson’s correlation analysis indicated that fsh catch per unit efort was positively and signifcantly 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 fshing net location are the statistically signifcant predictors of fsh catch per unit efort which represented fsh biomass. Findings further indicated that the model combining turbidity and dissolved oxygen predicted a 24% change in fsh catch per unit efort, whereas turbidity, dissolved oxygen, and the depth of fshing net location contributed a 28.9% change in fsh catch per unit efort. In conclusion, fsh 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 efect of algae bloom on fsh productivity. Infow of nutrients to the dam nourishes the algae biomass, thus creating vicious cycles on fsh productivity as fsh species in the dam failed to take advantage of high primary production by algae.
dc.description.sponsorshipDAAD
dc.identifier.citationhttps://doi.org/10.1155/2023/7353898
dc.identifier.urihttps://www.suaire.sua.ac.tz/handle/123456789/6262
dc.language.isoen
dc.publisherSokoine University of Agriculture
dc.relation.ispartofseriesVolume 2023, Article ID 7353898,
dc.subjectFish Productivity
dc.subjectWater Quality Variations
dc.subjectNyumba ya Mungu Dam
dc.subjectPangani Water Basin
dc.subjectTanzania.
dc.titleFish productivity response to water quality variations: A case study of Nyumba ya Mungu dam, in Pangani water basin, Tanzania
dc.typeArticle

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