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035			_a.b11746877
099			_aAIT Thesis no. AS-98-03
100	0		_aNguyen Nhu Tri
245	1	0	_aMollusc culture system and environmental conditions in Can Gio District, Ho Chi Minh City, Viet Nam
260			_aBangkok : _bAsian Institute of Technology, _c1998
300			_a79 leaves
490	1		_aThesis ; _vno. AS-98-03
500			_aA thesis submitted in pattial fulfillment of the requirements for the degree of . . Master of Science, School of Environment, Resources and Development
502			_aThesis (M.Sc.) - Asian Institute of Technology, 1998
520			_aThe study was conducted to determine the environmental conditions and current culture system of clam ( Meretrix lyrata Sowerby) and blood cockle ( Anadara granosa Linnaeus) in Can Gio district, Ho chi Minh city, Viet Nam. In the district, the sandy and mudflat areas which can be used to culture clam and blood cockle are 1,3 86 and 717 hectares, respectively. In the past, clam and blood cockle were collected from nature by local people with very low productivity. Clam and blood cockle cultures have just been promoted recently. The present study was based on two farms for clam and three farms for blood cockle. Samples of clam, blood cockle, water and substrate of culture beds were collected and analyzed monthly to determine the growth rate in relation to environmental conditions at different selected farms. The results showed that growth rate of clam at two selected farms was not significantly different during the study, although the soil texture of these two farms was significantly different, especially in sand and silt composition ( P<0.01). Growth rate of blood cockle at three selected farms (A, B and C) was significantly different, especially between A and C, B and C. There was no significant difference in growth rate between A and B. The growth rate of blood cockle had a close relationship with clay and organic matter compositions in the culture beds. In economic term, very good return was gained from molluscs farming. Profits per hectare per year were 1,439 $US and 2,519 $US and profit margin were 59.8% and 40.8% for clam and blood cockle, respectively. Therefore, clam and blood cockle culture in Can Gio district should be promoted more in the future to improve the livelihood of local people. However, major constraints of the culture systems are shortage of seed, lack of technical knowledge and price fluctuation. They should be solved in a proper way to stimulate future development of clam and blood cockle culture in the district.
650		0	_aClam culture _zVietnam _zHo Chi Minh
700	1		_aLin, Chang Kwei, _eChairperson
700	1		_aEdwards, Peter, _eExamination Committee
700	1		_aHambrey, John B., _eExamination committee
710	2		_aDANIDA, Denmark, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. AS-98-03
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B13105
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