Project Report from the year 2022 in the subject Geography / Earth Science - Oceanography, , language: English, abstract: This work aims to analyse the spatial and temporal variation of phytoplankton biomass in the eastern parts of the Unguja and Pemba Channels and its impact on anchovy catches. Secondary data from anchovy catches and Chl-a concentrations will be used as a proxy for phytoplankton biomass to gain important ecological and fisheries science insights. The study by Edward Paul, submitted to the University of Dar es Salaam, addresses the important role of phytoplankton as primary producers in aquatic ecosystems. Using secondary data on anchovy catches and Chl-a concentrations as a measure of phytoplankton biomass, the study examines the spatial and temporal variation of this biomass in the eastern parts of the Unguja and Pemba Channels and its impact on fisheries. Chl-a concentrations were found to be higher in Unguja than in Pemba, with significant differences between seasons. Interestingly, anchovy catches were higher in the Pemba Channel, with the correlation between Chl-a and anchovy catches being positive but not significant. These results provide important insights for fisheries science and the protection of marine ecosystems.