| Author | Nguyen Nhu Tri |
| Call Number | AIT Thesis no. AS-98-3 |
| Subject(s) | Clam culture--Vietnam|zHo Chi Minh
|
| Note | A thesis submitted in pattial fulfillment of the requirements for the degree of . .
Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The 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. |
| Year | 1998 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Aquatic Systems(AS) |
| Chairperson(s) | Lin, C. Kwei ; |
| Examination Committee(s) | Edwards, Peter ;Hambrey, John B.; |
| Scholarship Donor(s) | DANIDA, Denmark; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1998 |