Browsing by Author "Sandra Langi"

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Histological features of the gastrointestinal tract of elongate tiger fish, Hydrocynus forskahlii (Cuvier, 1819), from Lake Albert
(The Journal of Basic and Applied Zoology, 2024-05-10) Nasser Kasozi; Gerald D. Iwe; Sandra Langi; Victoria T. Namulawa; John Walakira
The tiger fish (Hydrocynus forskahlii) is an important food fish in different regions of Africa. As such, interest in its performance and nutritional requirements as a potential candidate for aquaculture is increasing. Char- acterization of the morpho-histological features and functions of the gut provides valuable insights into the feeding physiology and digestive system of fish species.
Integration of probiotics in aquaponic systems: an emerging alternative approach
(Aquaculture International, 2023-08-28) Nasser Kasozi; Gerald Degu Iwe; John Walakira; Sandra Langi
The increasing demand on water resources, reduced land for agriculture, and concerns over food and nutrition security have prompted the evolution of innovative and complex food production systems. In this context, e cient and sustainable food production systems such as aquaponics are viewed as an important and environmentally friendly technology for adaptation under resource-limited environments. Producing food in soilless systems is a promising strategy, as this method utilizes signi cantly less water than traditional agricul- ture. However, optimizing growing conditions to enhance crop and sh yields in aquapon- ics is frequently ambiguous and is often not economically feasible. One of the strategies to improve plant yields and supply of nutrients in aquaponics is the application of probiotics. With this strategy, the crop yields in aquaponics are improved via a variety of mechanisms, including nitrogen xation, solubilization of mineral nutrients, organic matter mineraliza- tion, plant hormone modulation, and biocontrol. As a result, incorporating probiotics in aquaponic systems is a strategy for mitigating environmental e ects and advancing sustain- able agriculture. This review paper provides the current knowledge of the use of probiot- ics in aquaponics. Suggestions for further studies on the e ects of probiotics in aquaponic systems are proposed. Through literature review, integrating probiotics into aquaponic systems has the potential to improve nutrient supply, modulation of water quality param- eters, and microbial communities, which are key processes in enhancing the productivity of aquaponic systems.
Scaling aquaculture for food security and employment in Africa: Insights from Egypt, Kenya and Nigeria
(Center for Development Research, University of Bonn, 2023-06-07) John K. Walakira; Etienne Hinrichsen; Victoria Tarus; Sandra Langi; Nabil Ahmad Ibrahim; Olanrewaju Badmus; Andrew Aziz; Heike Baumüller
Aquaculture is the fastest growing food sector in the world and now accounts for more than half of the fish consumed globally. However, the sector in Africa remains in its infancy, with the notable exception of Egypt, one of the world’s largest producers. This paper provides a thorough analysis of the sector in the selected countries of Egypt, Kenya and Nigeria to help identify investment and policy priorities that can sustainably advance aquaculture across Africa to boost income and employment, rural development and food security. The analysis focuses on nine themes to ensure a comprehensive overview of the sector and to better understand the relative strengths and weaknesses in each country: sector trends, national policy frameworks, government institutions, natural resources to support aquaculture, sector-specific innovation, feed and seed, market access, public-private partnerships, and sectoral impacts. With these in mind, the paper provides a series of recommendations for African policymakers and investors aimed at improving sectoral development across the continent. Among other factors, the recommendations highlight the need to not only increase productive capacity but also linkages to markets and consumers, adopt national policies that provide targeted support to high-potential areas, increase local research capacities and scaling of research results, decentralize seed and feed production for improved access, and promote sustainably produced fish as a promising source of animal-derived protein.