J. Bio. Env. Sci.12( 6), 11-20, June 2018
Commercial clam aquaculture in the coastal area of Tra Vinh province is significantly dependent on clam seed source. Annually, naturally breeding populations of hard clam occur on the tidal sand flats along the coast of Tra Vinh with different densities and often are exploited and brought to other places for nursery. In order to contribute to the efficient exploitation of natural resources, step by step take initiative in local clam seed sources, the model of clam seed nursing was studied. The model of clam seed nursery in the coastal area of Tra Vinh province was implemented during 9 months from June 2016 to February 2017 including 2 phases. Nursery in the coastal beach ridge was conducted in Phuong Nam Cooperative Group, Dong Hai Commune, Duyen Hai District, and the nursing stage on the tidal flat of Thanh Dat Cooperative, Hiep Thanh Commune, Duyen Hai Town. The clam seed source used in this model is the natural seed harvested in the coastal area of Tra Vinh province. Total 30 kg of clam grade I (150,000 ind. / kg) was released into the nursing pond. After 4 months, 220 kg of grade II clams (15,000 ind./kg) was obtained, reaching 73.3% survival rate. From October 2016, all 220 kg of clam seed is released on 5,000 m2 of clam fishery ground in Thanh Dat Cooperative. In February 2017, the result was 2.4 million clam individuals with the size of 600- 650 ind./kg reaching 72.7% survival rate. Establishing the model of natural hard clam seed nursery is to exploit effectively clam seed resources of the province, contribute to the sustainable development of clam fishery in Tra Vinh coastal areas.
Nguyen VH, Nguyen DH, Pham CT, Tran QM, Nguyen TT. 2001.Research on some environmental indices, biological characteristics and clam Meretrix lyrata (Sowerby, 1851) resources in the Mekong Delta. Proceedings of The first national conference on mollusk. Publisher of Agriculture, 176-189.
Nguyen VH. 2001. Biological retroductive characteristics of clam (Meretrix lyrata) in the Mekong Delta.Proceedings of scientific conference “Bien Dong – 2000”. NhaTrang, 219 – 230.
Nguyen DH, Pham CT, Tran QM, Nguyen TT. 1999. Research on some environmental indices, biological characteristics and clam (Meretrix lyrata) source of income in Mekong Delta.Sci. Rep. of Research Institute for Aquaculture 2.
Ta TKO, Nguyen VL, Nguyen TML, Pham CL.2014. Natural and environmental characteristics of Tra Vinh province coastal areas for the development of hard clam culture. Journal of Science and Technology Information of Tra Vinh Province, 1.
Nguyen HP.1996. Biological characteristics and tecniques of nursing clam (Meretrix lyrata, Sowerby). Aquaculture Science and Technology Information 7(8), 13-21 and 14-18.
Chu CT, Kumar MS.2008. Clam (Meretrix lyrata) hatchery manual. Manual report collaborative research between the South Australian Research and
Development Institute (SARDI) and Aquaculture Research Sub-Institute for North Centre (ARSINC), 34 pages.
Nguyen TT. 2010. Study on the model of protection and development of clam resources Meretrix lyrata (Sowerby, 1851), cockle Andara granosa (Linaeus, 1758) in Tien Giang, Ben Tre, Tra Vinh estuarine coastal areas. Scientific Report., Department of Science and Technology 197 pages.
People’s Committee of Tra Vinh Province, 2007. Land use plan for tidal flats. Development of coastal aquaculture in Duyen Hai, Cau Ngang and Chau Thanh districts, Tra Vinh province to 2010 and toward 2020”, 119 pages.