Technology and knowledge transfer has been a great challenge for many developing countries in South Asia due to poor information and communications technology networks. A limited number of institutions focused on science and technology, weak linkages among private and public institutions and political instability. These factors have hampered the successful transfer and diffusion of new and proven technologies between countries.
Based on lessons learned from field trials, carp-small indigenous fish species (SIS)-prawn polyculture technology was improved to a "carp-SIS polyculture" technology suitable for small scale farmers in Terai, Nepal. In December 2008, the project was initiated to improve income and nutrition of Tharu women in Chitwan (100 farmers) and Kailali (26 farmers) districts. The present paper presents the final results of the project.
Following two decades of work on aquaculture technologies for smallholder farmers, WorldFish is leading the aquaculture component of the Agriculture and Nutrition Extension Project (ANEP), targeting poor farmers in Bangladesh and Nepal.The main goal of ANEP aquaculture component was to increase fish production, household nutrition, incomes and alternative employment opportunities for smallholders by facilitating the adoption of productive and environmentally sustainable agricultural technologies.
Polyculture of tilapias (Oreo¬chromis niloticus and 0. mossambicus/O. niloticus hybrid) with shrimp (Penaeus orientalis) has been investigated several times in China since 1981. The results have caused much debate. Oppositionists held that finfish, especially tilapias, would rapidly consume the shrimp postlarvae and juveniles as happened when shrimp were put together with tilapias in a small tank. This article gave an overview of this practice in China.
Two sustainable, low-cost pond polyculture technologies have been developed to culture carps and mola in ponds, and culture carps and mola in ponds connected to rice fields. These technologies can increase total fish production from ponds. Farmers depend on carps as an income source, and mola is rich in micronutrients that can help to meet the nutritional requirements of the rural poor, particularly women and young children.
The climate, land and water resources of Cameroon, combined with the high demand for fisheries products, makes this Central African country a high potential area for aquaculture. Fingerling availability and quality have been identified as key constraints which hold the sector back from rapid expansion. Nile tilapia (Oreochromis niloticus) and sharptooth catfish (Clarias gariepinus) are the two most widely cultured species and are often grown in polyculture. Some 32 government hatcheries have been built, but few are functional and none operates at full capacity.
African catfish Clarias gariepinus is widely distributed through and has long been considered as one of the most suitable species for culture in Africa (El Bollock & Koura, 1960; De Kimpe & Micha, 1974). C.Gariepinus had been introduced into Europe, Asia and Latin America for farming purposes. Despite being native to Africa, this fish species have not yet played the role it is supposed to play in the African aquaculture. To a large extent the poor performance of Clarias sp.
The research documented in this article estimates the levels and determinants of farm-level technical efficiencies (TE) in freshwater pond polyculture systems in China, India, Thailand, and Vietnam. The levels of country-specific TE were estimated for different production intensity levels by estimating stochastic production frontier functions involving the model for technical inefficiency effects. The results were compared with estimates from past studies of aquaculture TE. It was found that yield, input levels, and TE increases in line with intensity levels.
The paper discusses the status of freshwater aquaculture, and the productivity and cost effectiveness of alternative technologies in the major fish producing countries in Asia, such as Bangladesh, China, India, Indonesia, the Philippines, Thailand and Vietnam. The analysis is based on field survey data collected by the WorldFish Center and its partner research institutes, and supplemented by secondary information. The paper adopts descriptive techniques to compare the performance of each technology across the countries in terms of productivity, cost effectiveness and profitability.
Shire tilapia, Oreochromis shiranus shiranus (Boulenger 1897), was grown in monoculture and polyculture with either straightfin barb, Barbus paludinosus (Peters 1852), or threespot barb, Barhus trimaculatus (Peters 1852), (collectively known as matemba) under conditions which simulated smallholder farming conditions in Southern Malawi. Over 150 days, B. paludinosus-O. shiranus shiranus polyculture was significantly (P < 0.05) more productive than either O. shiranus shiranus or B. paludinosus monoculture. Over 107 days. B. trimaculatus-O.