Low-input cage culture: towards food security and livelihood improvement in rural Kenya.

2020 ◽  
Keyword(s):  
Lake Victoria ◽  
Farming Systems ◽  
Cage Culture ◽  
Lake Victoria Basin ◽  
Fish Food ◽  
Low Input ◽  
Food And Feed ◽  
Rural Kenya ◽  
Global Increase ◽  
Area Of Concern

Abstract Recent experiences and successes including the dwindling capture fisheries and global increase in aquaculture production have spurred interest in the development of commercial cage culture in Africa. This case study centres on cage culture of tilapia in Kenyan waters of Lake Victoria and in satellite dams within Lake Victoria's catchment. It reports on unique challenges and the innovative ways in which Kenyan fish farmers and fishers have had to undertake to ensure success. Increased public concern and suspicion on the long-term environmental and ecological sustainability of cage-based farming systems in the lake has been a major area of concern. This study presents ways in which farmers and researchers have managed to rear caged fish with low input fish food and feed, provide quality fish seed, use locally available materials for making cages and ensure cage security. Cage culture can be beneficial in the Lake Victoria basin as emerging constraints are resolved.

L'élevage en cage à faible niveau d'intrants: vers la sécurité alimentaire et L'amélioration du niveau de vie en zones rurales au Kenya.

2020 ◽  
Author(s):  
Harrison Charo-Karisa ◽  
Jonathan M Munguti ◽  
Herwig Waidbacher ◽  
David Liti ◽  
Werner Zollitsch
Keyword(s):  
Lake Victoria ◽  
Low Cost ◽  
Farming System ◽  
Cage Culture ◽  
Lake Victoria Basin ◽  
Sécurité Alimentaire ◽  
Aquaculture Production

Abstract Recent experiences and successes, including the decline in capture fisheries and the overall increase in aquaculture production, have sparked the development of commercial cage culture in Africa. This case study focuses on tilapia cage culture in the waters of Lake Victoria in Kenya and in secondary dams in the Lake Victoria basin. It highlights the challenges and innovations that Kenyan fish farmers and fishermen have demonstrated to achieve success. In particular, the study takes into account the public's ever-growing interest in and questioning of the sustainability of this farming system in the lake, both ecologically and environmentally. This study presents how fish farmers and researchers have successfully reared caged fish with low cost feed, to produce quality seeds, and to use locally available materials for the construction and safety of cages. Cage farming can be profitable in the Lake Victoria basin if the obstacles that arise as the process develops are gradually overcome.

A spatial analysis of climate-related child malnutrition in the Lake Victoria Basin

2015 ◽  
Author(s):  
David Lopez-Carr ◽  
Kevin M. Mwenda ◽  
Narcisa G. Pricope ◽  
Phaedon C. Kyriakidis ◽  
Marta M. Jankowska ◽  
...  
Keyword(s):  
Spatial Analysis ◽  
Lake Victoria ◽  
Child Malnutrition ◽  
Lake Victoria Basin

scholarly journals Recent changes in terrestrial water storage in the Upper Nile Basin: an evaluation of commonly used gridded GRACE products

2017 ◽  
Vol 21 (9) ◽  
pp. 4533-4549 ◽  
Author(s):  
Mohammad Shamsudduha ◽  
Richard G. Taylor ◽  
Darren Jones ◽  
Laurent Longuevergne ◽  
Michael Owor ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Lake Victoria ◽  
Water Storage ◽  
Terrestrial Water Storage ◽  
Nile Basin ◽  
Lake Victoria Basin ◽  
Groundwater Storage ◽  
Terrestrial Water ◽  
Substantial Uncertainty

Abstract. GRACE (Gravity Recovery and Climate Experiment) satellite data monitor large-scale changes in total terrestrial water storage (ΔTWS), providing an invaluable tool where in situ observations are limited. Substantial uncertainty remains, however, in the amplitude of GRACE gravity signals and the disaggregation of TWS into individual terrestrial water stores (e.g. groundwater storage). Here, we test the phase and amplitude of three GRACE ΔTWS signals from five commonly used gridded products (i.e. NASA's GRCTellus: CSR, JPL, GFZ; JPL-Mascons; GRGS GRACE) using in situ data and modelled soil moisture from the Global Land Data Assimilation System (GLDAS) in two sub-basins (LVB: Lake Victoria Basin; LKB: Lake Kyoga Basin) of the Upper Nile Basin. The analysis extends from January 2003 to December 2012, but focuses on a large and accurately observed reduction in ΔTWS of 83 km3 from 2003 to 2006 in the Lake Victoria Basin. We reveal substantial variability in current GRACE products to quantify the reduction of ΔTWS in Lake Victoria that ranges from 80 km3 (JPL-Mascons) to 69 and 31 km3 for GRGS and GRCTellus respectively. Representation of the phase in TWS in the Upper Nile Basin by GRACE products varies but is generally robust with GRGS, JPL-Mascons, and GRCTellus (ensemble mean of CSR, JPL, and GFZ time-series data), explaining 90, 84, and 75 % of the variance respectively in "in situ" or "bottom-up" ΔTWS in the LVB. Resolution of changes in groundwater storage (ΔGWS) from GRACE ΔTWS is greatly constrained by both uncertainty in changes in soil-moisture storage (ΔSMS) modelled by GLDAS LSMs (CLM, NOAH, VIC) and the low annual amplitudes in ΔGWS (e.g. 1.8–4.9 cm) observed in deeply weathered crystalline rocks underlying the Upper Nile Basin. Our study highlights the substantial uncertainty in the amplitude of ΔTWS that can result from different data-processing strategies in commonly used, gridded GRACE products; this uncertainty is disregarded in analyses of ΔTWS and individual stores applying a single GRACE product.

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