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Production trends and yield predictive models for culture-based fisheries in irrigation reservoirs of Sri Lanka
(Australian Center for International Agricultural Research, 2026) Adikari, A.M.A.N.; De Croos , M.D.S.T.; Amarasinghe , U.S.; Perera , H.A.C.C.
This study aims to develop empirical yield predictive models for CBF in perennial irrigation reservoirs of Sri Lanka, focusing on the GFP (M. rosenbergii), alongside carp and tilapia species. Conducted across 39 reservoirs, the research involved the collection of extensive data on species stocking densities, fish yields and various limnological parameters. Results indicate that stocking densities of carp and GFP significantly influenced yields, with optimal stocking densities identified as over 900 fingerlings ha-¹ yr-¹ for carp and approximately 1,000 post larvae ha-¹ yr-¹ for GFP in major reservoirs. Notably, the study found a significant relationship between fishing intensity and carp yield, although no such correlation was observed for GFP. Limnological assessments revealed that chlorophyll-a concentrations positively correlated with carp yields, while other parameters exhibited limited variability. TSI indicated that most reservoirs were classified as eutrophic. PCA highlighted key variables influencing productivity, with significant relationships established for carp yield. The study underscores the critical role of stocking strategies and limnological factors in optimising fish production, providing valuable insights for sustainable aquaculture development in Sri Lanka’s inland water bodies. The predictive models developed offer a framework for enhancing CBF, thereby contributing to improved livelihoods in rural communities reliant on freshwater fish as a vital protein source.
The culture-based fishery of giant freshwater prawn in Sri Lankan perennial reservoirs: evaluation of past stocking and production data
(Australian Center for International Agricultural Research, 2026) Digamadulla, D.S.; Amarasinghe , U.S.; Wijenayake , W.M.H.K.; Jayasinghe-Mudalige , U.K.; De Croos , M.D.S.T.
The present study has been articulated as a system approach to sustainably develop the high valued giant freshwater prawn (FWP) CBF in Sri Lankan perennial reservoirs. The approach comprised of (a) appraising past stocking practices; (b) assessing reservoir capacity and CBF performance with multiple strategic scientific studies; (c) investigating possible measures to increase the production and recapture; (d) identifying the market driving factors; and (e) understanding the constraints in the management of a socioecological system. Based on the scientific evidence, recommendations for better approaches for future FWP CBF have been suggested.
Analysing the agrarian reservoir environment to optimise culture-based fisheries in Sri Lanka
(Australian Center for International Agricultural Research, 2026) Jayasinghe, A.D.
Compared to the long agrarian history of Sri Lanka, inland fisheries in agrarian reservoirs are a recent development based mainly on introductions of exotic species. The aim of this short review is to analyse published information on agrarian reservoir environment and its suitability for fisheries production. In global scale, total fisheries production keeps rising due to both marine and inland aquaculture inputs, and a similar trend can be found in Sri Lanka as well. The development of culture-based fisheries (CBF) in agrarian reservoirs was not efficient at first, due to lack of knowledge on the limnological properties of the reservoirs. Since then, several scientists have formulated relationships between fish yield and the reservoir nutrient levels and other factors deciding primary production. Lately, indigenous riverine giant freshwater prawns (GFP) were introduced to the reservoir systems as a culturable species to diversify the catch and boost the income of rural fishing communities. Despite the continued stocking, the catch of GFP in return was not comparable. As a solution, proper scientific investigations on harvesting techniques, assessment of existing biomass, GFP distribution in microhabitats and their interactions with the agrarian reservoir environment and co-existing species, were subject to research.
Analysing the agrarian reservoir environment to optimise culture-based fisheries in Sri Lanka
(Australian Center for International Agricultural Research, 2026) Jayasighe, A.D.
Compared to the long agrarian history of Sri Lanka, inland fisheries in agrarian reservoirs are a recent development based mainly on introductions of exotic species. The aim of this short review is to analyse published information on agrarian reservoir environment and its suitability for fisheries production. In global scale, total fisheries production keeps rising due to both marine and inland aquaculture inputs, and a similar trend can be found in Sri Lanka as well. The development of culture-based fisheries (CBF) in agrarian reservoirs was not efficient at first, due to lack of knowledge on the limnological properties of the reservoirs. Since then, several scientists have formulated relationships between fish yield and the reservoir nutrient levels and other factors deciding primary production. Lately, indigenous riverine giant freshwater prawns (GFP) were introduced to the reservoir systems as a culturable species to diversify the catch and boost the income of rural fishing communities. Despite the continued stocking, the catch of GFP in return was not comparable. As a solution, proper scientific investigations on harvesting techniques, assessment of existing biomass, GFP distribution in microhabitats and their interactions with the agrarian reservoir environment and co-existing species, were subject to research.
The role of the National Aquaculture Development Authority in the culture-based fisheries project
(Australian Center for International Agricultural Research, 2026) Pothuwila, R.H.and; Gunasena, M.G.; Asoka, J.M.