Intensive aquaculture systems (e.g. pangasius farming) make important contributions to food security in developing countries, including Bangladesh, but are associated with a variety of negative environmental impacts, including the discharge of nutrient rich sediments into local ecosystems.
The development of a saline tolerant tilapia strain able to grow fast is of importance in the Philippines, where 240 000 ha of brackish water ponds are available. To this end, founder hybridization between Oreochromis niloticus (with favorable growth traits) and O. mossambicus (with favorable salinity tolerance traits) was performed and followed by backcrossing with O. mossambicus to develop a strain highly tolerant to saline environments. Genetic selection for growth performance was subsequently conducted.
The frustrations encountered when trying to compare technical reports in which fishpond yield figures are reported in a variety of units (e.g., kg/ha, kg/pond, lb/acre, etc.) are familiar to most aquaculturists. However, severe problems may develop when trying to com¬municate research results to other audiences if data are transformed to a hectare basis. The authors gives his own experience in conveying research data to the farmers and the problem encountered.
This paper assesses factors influencing adoption of new shrimp aquaculture technologies within aquatic-agricultural farming systems in southwestern Bangladesh. The impacts of three new technologies were assessed: two Modified Traditional Technologies (MTT 1 and MTT 2) and a Closed System Technology (CST). A total of 789 farmers from 10 sub-districts in Khulna Division were surveyed randomly, including a control group of 350 farmers using traditional technologies.
Fish production in Vietnam increased rapidly from 420 000 t in 1981 to 1 130 680 t in 1998. Likewise, there was an expansion in the number of motorized fishing boats from 29 584 units with an average horsepower (HP) of 19.8 boat-1 in 1981 to 71 800 units with an average HP of 26.2 in 1998. In 1995, fish production was valued at VN$2 475 billion (US$0.02 billion at 1 US$ = 11 041 VN$; source: oanda. com).
A brief account is given of the results of a grow-out trial conducted regarding the freshwater prawn (Macrobrachium rosenbergii ) in a farm pond in Ghana with water at temperatures of 30-33 C. Results showed that 70% of the prawns achieved lengths of over 13 cm and wet weight of > 35 g, figures which compare favourably with growth rates achieved in other parts of the world. Although M. rosenbergii culture is viable in Ghana, problems exist which prevent further development, the major one being lack of foreign exchange to purchase juveniles.
The Brackishwater Aquaculture Development and Training Project, a cooperative effort of the Government of the Philippines, represented by the Bureau of Fisheries and Aquatic Resources (BFAR) under the Ministry of Natural Resources (MNR), the United Nations Development Programme (UNDP), and the Food and Agriculture Organization of the United Nations (FAO), became operational in April 1977. The author was project leader, representing FAO/UNDP until the project was completed in early 1983.
The rural populations of southern Bangladesh are some of the most vulnerable communities in the world to the future impacts of climate change. They are particularly at risk from floods, waterlogged soils, and increasing salinity of both land and water. The objective of this project was to analyze the vulnerability of people in four villages that are experiencing different levels of soil salinity.
South-East Asia has traditionally been the global centre of production of tropical sea cucumbers for Chinese markets. Early research into culture methods took place outside this region, notably in India, the Pacific region and China. However, recent investment in Holothuria scabra (sandfish) culture has led to some significant advances within this region. The Philippines and Vietnam have been at the forefront of recent efforts, with involvement from substantial national programs and local institutions as well as international donors and scientific organisations.
As part of the Philippines' plan to accelerate the country's rate of aquaculture development, a study team was sent to neighboring Southeast Asian countries to observe advances for improving and developing aquaculture in the Philippines. The 3-man team, of which the author was a member, toured Malaysia, Thailand, Japan, and Taiwan. This article is a brief account of observations from the trip and interviews with authorities from selected fisheries agencies, with emphasis on freshwater aquaculture.