The potential benefits of using giant clam farming systems to rear trochus for restocking were investigated in Solomon Islands.
The large body of information available on tilapia biology and culture presents a confusing picture to the prospective culturist. Further stock improvement and standardization of intensive culture methods are needed. Concentration on a few species - Oreochromis aureus, O. niloticus, their hybrids and the 'red' tilapias will facilitate progress. the macrophyte-feeder Tilapia rendalli may also have potential particularly for polyculture with microphagous tilapias. International cooperation is recommended for establishing research facilities and programs.
Upland farming systems can have severe negative effects through intensified slash-and-burn activities, erosion-enhancing farm practices on moderate to steep slopes, and further encroachment into forest areas. ICLARM studied, in a 2-year applied research activity, opportunities for the improvement of existing pond management practices in an upland forest buffer zone environment, mainly through integration with other farm enterprises and through the introduction of polyculture.
Three major carp species, viz. catla Catla, Labeo rohita and mrigal Cirrhinus mrigala, are farmed in polyculture systems in the southern state of Andhra Pradesh, India. A survey of 189 carp farms was undertaken, and principal component analysis was used to assess the relationships between farm inputs and fish yield. Model results exhibited a strong relationship of yield with the stocking density of all three major carp species.
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.
Common carp (Cyprinus carpio) is the single most important species for aquaculture in the state of Karnataka, India, where it is generally grown in polyculture with Indian major carps. Precocious maturation and unwanted reproduction in the species have been identified as constraints to increase production in aquaculture and culture-based fisheries in Karnataka state. Stocks of C.
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 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.
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.
The paper reviews freshwater and coastal aquaculture practices in Thailand, and compares the productivity, costs, and benefits across various types of cultivation and various intensities of production. The paper is based on data that were collected in surveys conducted during 1998-2001 by the Department of Fisheries (DOF), Thailand and the WorldFish Center. More than 22% of Thailand's fish supply comes from aquaculture, with coastal aquaculture accounting for more than 88% of this in terms of value.