High-resolution bathymetries and shorelines for the Great Lakes of the White Nile basin

This article is licensed under a Creative Commons Attribution 4.0 International License.HRBS-GLWNB 2020 presents the first open-source and high-resolution bathymetry, shoreline, and water level data for Lakes Victoria, Albert, Edward, and George in East Africa. For each Lake, these data have three primary products collected for this project. The bathymetric datasets were created from approximately 18 million acoustic soundings. Over 8,200 km of shorelines are delineated across the three lakes from high-resolution satellite systems and uncrewed aerial vehicles. Finally, these data are tied together by creating lake surface elevation models collected from GPS and altimeter measures. The data repository includes additional derived products, including surface areas, water volumes, shoreline lengths, lake elevation levels, and geodetic information. These data can be used to make allocation decisions regarding the freshwater resources within Africa, manage food resources on which many tens of millions of people rely, and help preserve the region’s endemic biodiversity. Finally, as these data are tied to globally consistent geodetic models, they can be used in future global and regional climate change models.ECU Open Access Publishing Support Fun

Changes in the Diet of Synodontis victoriae and Synodontis afrofischeri in Lake Victoria, Tanzanian waters.

The diet of Synodontis victoriae and S.afrofischeri was investigated from samples collected for stomach analysis in May 2013, October 2013, and April 2014 in the Tanzanian waters of Lake Victoria. The diet of S. victoriae was dominated by freshwater shrimps Caridina nilotica followed by unidentified fish remains, the cyprinids Rastrineobola argentea and Enteromius profundus as well as insects, molluscs, haplochromines and worms. The diet of S. afrofischeri was dominated by R. argentea followed by insects, fish remains, worms, molluscs, C. nilotica, algae and haplochromines. There was considerable variation in the diets of both species collected at different times and they displayed considerable plasticity in their diet. Both species exhibited a wider range of diet, utilizing food items that may not have been available before the changes in the lake that followed the Nile perch upsurge in the 1980s.Keywords: Caridina nilotica, Diet expansion, Food and Feeding habits, Rastrineobola argentea, Seasonal variatio

The socio-economic implications of illegal fishing practices in Lake Victoria: A case study of three Villages in Tanzania

Illegal fishing is a threat to the sustainability of fisheries in Lake Victoria and this paper examines the influence of socio-economic factors on illegal fishing practices. The study was conducted in three villages around Nyegezi Bay of Lake Victoria where a total of 240 households were surveyed. Results indicate that there is highly significant correlation between illegal fishing and ages in one of the study villages, but this was not the case in the others, which suggests that age alone is not a sufficient factor to explain illegality. Further findings reveal that there is highly significant positive correlation between income and education on one hand and on another hand income and residence, which suggests that poverty is a driver of illegalities when linked to the education and residence. In addition, there is highly significant negative  correlation between residence and education revealing a migration of poorly-educated people, probably for search of employment opportunities. Generally, the study has shown that there exists direct correlation between socio-economic factors with illegal fishing practices. Based on the findings, we suggest that improving the social and economic statuses of these community through improving education and increasing opportunities for alternative sources of livelihoods may help address the issue of illegality in these areas.Keywords: Age, Employment, Illegal fishing, Income,  management measures, Poverty