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Dynamics of Fish Stocks and Commercial Fisheries in Lake Victoria, East Africa: Implications for Management

Authored by Brad Czerniak
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The fishery of Lake Victoria is dominated by three fish species: the introduced species Nile perch (Lates niloticus), Nile tilapia, (Oreochromis niloticus), and the native Silver fish Dagaa (Rastrineobola argentea). Over time fish stocks have been changed both in composition and relative abundance in response to multiple stressors including but not limited to the changing water environment and the ever increasing fishing pressure. Therefore, this research reviews the available data on the current status of the fisheries of these three major fish species and proposed management measures in line with sustainable exploitation to support wealthy creation and nutritional security. The results indicated that there has been a progressive reduction in abundance of Nile perch and Nile tilapia over the years and a corresponding increase of Dagaa in the same period reaching a maximum of 1.3 mt compared to 1.1 mt for Nile perch in 2015. The highest proportion of Nile perch (65%) was registered to in 2001 and dropped to the lowest of 35.6% in 2015, while that of Dagaa increased from 20.2% in 1999, to a maximum of 44.4% in 2014, but has currently decreased to 40.7% in 2015. Catch rates of Oreochromis niloticus decreased significantly over the years with the 2014 survey recording the lowest catch rate of 1.36±0.65 kg/hr. The high fluctuations in relative abundance and composition call for regular monitoring of these fish stocks to understand the cause and the provision of timely scientific advice to guide their management.

Resource Type
Report
Theme
Sustainable Fisheries and Aquaculture Management
Geography
Kenya
Rwanda
Tanzania
Uganda
Lake Victoria
Publication Date
May 1 2017
Tag
African Great Lakes Conference
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Illegal, Unregulated and Unreported Fishing on Africas Great Lakes

Report
Authored by Brad Czerniak

Illegal, Unregulated and Unreported (IUU) fishing has been reported in many publications;_this_research project_provides an overview of the extent of IUU fishing on the African Great Lakes. Stock has been taken of fisheries regulations and legislations in the riparian countries to understand the diversity of the interpretation of illegal fishing operations. A summary has been presented of the regulations governing the target species of the different fisheries.

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Development of Best Practices for Cage Fish Farming to Increase Fish Production

Report
Authored by Brad Czerniak

Cage fish farming is growing fish in net enclosures suspended in water at high density in low volume (LVHD) or low density in high volume (HVLD) cages while maintaining free water exchange between the enclosure and the water body. Cage fish farming has increased in the African Great Lakes (AGL) region, since the beginning of the 21st century and has in less than 20 years, demonstrated capacity to increase fish production to more than 40 kg m-3 compared to ~5 kg m-3 from ponds which started more than 60 years ago.

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Ecological Risks of Net Pen Aquaculture in North American and African Great Lakes: Can BMPs Be Shared?

Project
Authored by Brad Czerniak

A recent expert review of the ecological risks of net pen aquaculture in the North American Great Lakes made a number of recommendations for Best Management Practices (BMPs) that should be applied to establishment of net pen farms. Based on that_study, researchers identified nine generic BMPs that could be applied to all Global Great Lakes.

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A Century of Rainfall Variability and Recent Change in the African Great Lakes Region

Report
Authored by Evans A.K. Miriti

The Great Lakes of Africa help to sustain the economies of several East African nations. Changes in the condition of these lakes is of great concern. The objective of this research was to examine long-term variations of precipitation in the Great Lakes region. Rainfall over the catchment was assessed for Lakes Albert, Edward, Kivu, Malawi, Tanganyika, Turkana, and Victoria, using gauge data. In most cases over 100 years of record are available. Assessments were also made for the region as a whole. TRMM satellite estimates of precipitation were also used to examine the years since 1998.

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From Fishing Rights to Human Rights in the Lives and Livelihoods of Women Fishers in the Great Lakes Region

Report
Authored by Brad Czerniak

This research project analyzes gender-based violence in cross-border fish trade in the GLR using a human rights perspective. A human rights perspective provides an understanding of the socio-economic conditions facing women fishers in the GLR. Expanding on established research on fishing rights of marginalized people, this analysis highlights human rights issues that have been less documented: gender-based cross-border violence and threats to personal security in the GLR.

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Impacts of Climate Change on the Water Balance in Lake Victoria

Report
Authored by Brad Czerniak

The hydrology of Lake Victoria is, to a large extent, a function of the balance between rainfall on and evaporation from the lake surface. Historical climate variability has resulted in significant fluctuations in the water level in the lake. Climate models predict changes to the balance between precipitation and evaporation over the coming decades, with potentially serious impacts on the lakes water balance. These impacts have implications for the approximately 30 million people living around the lake, as well as further downstream in the Nile River basin.

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Lake Level Fluctuations, Ecological Attributes and Fish Productivity in African Lakes and Reservoirs

Report
Authored by Brad Czerniak

Hydrological regimes, including inter- and intra-annual water level fluctuations, are key drivers of productivity and structure in freshwater ecosystems in Africa, where inland fisheries are a vital source of income and protein. Using a synthesis of seventeen standardized food web models of thirteen African lakes and reservoirs, this study explored the relationship between inter- and intra-annual water level fluctuations and sixteen ecological attributes associated with ecosystem configuration, productivity and maturity.

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Prognosis for Long-term Sustainable Fisheries in the African Great Lakes

Report
Authored by Brad Czerniak

The three largest lakes of the African Great Lakes system, Victoria, Tanganyika and Malawi, have distinctive fisheries and histories of fisheries management. All three provide essential and high quality food to their riparian populations and a range of other ecosystem services. Lakes Victoria and Tanganyika have highly commercialised and lake-wide, open-water fisheries. In Lake Malawi the commercial fishery is largely confined to the southern end of the lake, mainly exploiting demersal fish. Artisanal and low-level subsistence fisheries occur throughout all three lakes.

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Status of Two Native Lake Victoria Tilapiine Species: Oreochromis esculentus and O. variabilis (Graham 1929) in Satellite Lakes, Tanzania

Report
Authored by Brad Czerniak

Lake Victoria and its basin are comprised of enormous areas of permanent and seasonal small water bodies that have been singled out as important faunal reservoirs for the endangered and threatened native species of Lake Victoria. Two tilapiine fish Oreochromis esculentus and O. variabilis are endemic and were the most commercial species in the lake fishery in early 1900s. Pressure on the fisheries and introduction of new fish species caused a severe decline of these species from the lake.

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