Improvements to ﬁsh yield in small water bodies as well as to the incomes and nutritional status of rural communities have been demonstrated in Laos, Sri Lanka and Vietnam but culture-based ﬁsheries practices are not yet widespread, despite having signiﬁcant potential in tropical climates. A project to introduce culture-based fisheries to Cambodia is described. Participating communities reported improved catch per unit effort, an increase in the number of people engaged in fishing and lower food costs.
This manual provides basic guidelines for the hatchery production of Pa Phia (Labeo chrysophekadion) fingerlings. It provides information on managing and spawning broodstock, genetic guidelines, egg incubation, hatching larviculture and fry rearing. The manual draws on published information on Pa Phia; results of artificial propagation trials conducted on Pa Phia during two projects funded by the Australian Centre for International Agricultural Research and the experiences of technicians at two government hatcheries.
Peter Edwards writes on rural aquaculture: Further training provided to aquaculturists in Fiji.
Spatial planning for sustainable coastal shrimp production.
Olivier M. Joffre, Pham Dang Tri, Tran Thi Phung Ha, Roel H. Bosma
Research and farming techniques
Availability of grouper (Serranidae) fingerlings and seed in the coral reef of Son Tra Peninsula, central Viet Nam.
Nguyen Thi Tuong Vi, Vo Van Quang, Le Thi Thu Thao, Tran Thi Hong Hoa, Tran Cong Thinh
People in aquaculture
Small-scale carp seed production through portable FRP hatchery at Khanguri, Odisha: A case of technology transfer in remote and inaccessible village.
B. C. Mohapatra, N. K. Barik, S. K. Mahanta, H. Sahu, B. Mishra and D. Majhi
This book is the proceedings of the “Regional Consultation on Culture-Based Fisheries Development in Asia”, held in Siem Reap, Cambodia, 21-23rd of October 2014, under the auspices of the Australian Centre for International Agricultural Research (ACIAR), the Mekong River Commission (MRC) and the Network of Aquaculture Centres in Asia-Pacific (NACA). The consultation was jointly organised by NACA and the Fisheries Administration of the Royal Government of Cambodia.
Food and nutritional security remains problematic in many developing countries. There are many initiatives underway which are designed to increase food supply, employment and income opportunities, most of which require considerable capital inputs (for instance cropping, livestock production and aquaculture). Often overlooked, are the opportunities to produce more food from the natural productive ecology of lakes and forests. Culture-based fisheries are one example of a relatively simple and low cost technology which can deliver nutritional and economic benefits to communities which often have few livelihood options.
Culture-based fisheries are based in lakes and reservoirs, where fish populations are supplemented by hatchery-produced fingerlings. The stocked fish may breed naturally in the lakes, or they may be species which are desirable but which do not breed in the still-water environments. Fish growth is driven by the natural productivity of the water bodies. Generally, local communities have ownership of the fish, with the benefits shared or used for communal purposes. However, there are other options for management and ownership depending on local needs, cultural arrangements and other uses of the water.
Research and development of culture-based fisheries has been a major endeavour for NACA and ACIAR since the mid-1990s. This has involved projects in Sri Lanka, Indonesia, Vietnam, Lao PDR and Cambodia, the results of which have been reported in previous publications, as noted below. In this volume, we bring together an update from research conducted in those countries and others. We trust the information will foster further development and spread of culture-based fisheries in Asia and beyond, and in doing so, bring livelihood and nutritional benefits to otherwise resource-poor communities.
Lakes amount to 15% of the total freshwater surface area in China and are important for land-based fisheries. More than 10 species are stocked into lakes to increase production and/or improve water quality. The most common species stocked are the Chinese major carps, i.e. silver carp, bighead carp, grass carp and black carp. In recent years, increasing amount of high valued species such as mandarin fish, mitten crab, yellow catfish and culters were stocked. However, the stocking of mandarin fish and mitten crab perhaps are the most successful because stock enhancement of these two species has been systematically conducted.
In this paper, the culture-based fisheries in lakes are presented, with special reference to mandarin fish and mitten crab stocking in lakes in China. The stocking rate of mandarin fish is determined by food consumption rates, which are mainly related to water temperature and fish size, and prey fish productivity. A bioenergetics model of mandarin fish was established to predict the growth and consumption of prey fish in stocked lakes. Impacts of stocked mandarin fish on wild mandarin fish populations are also dealt with. The stocking model of mitten crab in of culture-based fisheries was also determined based on biomass of macrophyte coverage, benthos biomass and ratio of Secchi depth to mean water depth in lakes.
Since increasing attention is being paid to eutrophication of lakes in China, land-based fisheries development now prioritise maintaining integrity of water quality and biodiversity conservation. Integrated stocking of different species and lakes fisheries management are also addressed.
Releasing of giant freshwater prawn (Macrobrachium rosenbergii) for the purposes of stock enhancement and to create a fishery has been conducted in Thailand since the 1980s. In each year, over a hundred million post larvae (30 day old post larvae of ~1 cm) of M. rosenbergii have been released into inland waters nationwide. The stocking density is, generally, about 2,500 prawn larvae/ha. Average age at harvest is around 6 to 8 months, with an average total length of 20 cm. The individual weights can range between 100 and 200 g after a year of release. Common fishing gears are gillnet, long-lines and traps, the latter designed exclusively for M. rosenbergii. Overall, the success of stocking M. rosenbergii is poor since the recapture rate is generally less than 5 %. However, the economic return is high. Average market price of M. rosenbergii is 150 Thai Baht/kg, which is about 3 times more than the average price of marketed freshwater fish. The profit is reported to be as high as 800 %. Moreover, the high market price of M. rosenbergii benefits traders at various levels, job creation and income for all related sectors. Although the economic profit is very high, the low rate of recapture of stocked M. rosenbergii makes this culture-based practice not entirely satisfactory. The major problem is that there are no guidelines in regard to the optimum size of seed for release as well as appropriate time and location to be stocked, that could enhance the rate of return and economic returns.
Sri Lanka is blessed with a large number (>12,000) of irrigation reservoirs. Depending on their hydrological regimes, they are broadly categorised into perennial and seasonal reservoirs and are secondarily used for inland fisheries. Culture-based fisheries (CBF) in seasonal reservoirs was initiated in the 1980’s and it is well documented. The Government of Sri Lanka has recognised CBF as an effective way of increasing fish supplies in rural areas, at affordable prices, while also providing employment and additional income to rural farmers and thereby contributing towards alleviation of poverty. There are around 200,000 ha of perennial reservoirs in Sri Lanka. These reservoirs are divided into three broad size categories, minor (<200 ha), medium (200 - 800 ha) and major (>800 ha). In this paper the impact of introduction of CBF on fish production in minor, medium and major perennial reservoirs are assessed using the fish production data from eight minor, seven medium and two large reservoirs. In all three categories of reservoirs post CBF resulted in very significant increases in fish production, such as for example increases of 206 and 319 % average annual fish production in minor and medium sized reservoirs, respectively.
Available provisions under the Fisheries and Aquatic Resources Act No. 02 (1996) to ensure ownership of the fish harvest to the fisher community, a crucial element in the success of CBF, are also highlighted. Further, the role of fisher community based organisations and fisheries management measures introduced for effecting successful CBF practices are also discussed.
Fish stocking in Indonesian lakes and reservoirs has been conducted for a long time. Since 1999, culture-based fisheries (CBF) practices based on scientific evidence such as using suitable fish species, consideration of the primary productivity, stocking density, economic evaluation and community participation, have been conducted in some reservoirs and lakes and have showed encouraging results. Potential fish yield of a water body for CBF development is one of the important factors in determining its success. Potential fish yield of some lakes and reservoirs was estimated using a morpho-edaphic index or primary productivity approach, and the water bodies were classified based on morpho-limnological characteristics. Estimated potential fish yield of small reservoirs/lakes with an area between 1.0-200 ha showed the highest potential with an average yield of 2835 ± 623.6 kg/ha/yr compared to the others of lager area. In the future, therefore, development of CBF was highly recommended and prioritised in small reservoirs with an area less than 200 ha, mostly distributed in Sumatera, Java, and Nusa Tenggara with more than 2,000 reservoirs. However, about 80% of those reservoirs were categorised as idle presently.