| Author | Chuanpid Thongkum |
| Call Number | AIT Thesis no.AE-88-33 |
| Subject(s) | Crab culture--Thailand--Surat Thani
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The rearing of ma n grove crabs ( Scyll a serrata ) in
pond s in the Kanjanadith District of Surat Thani was assessed.
Various people concerned with commercial production of mangrove
crabs farmers, fishermen, villagers and middle me n were
interviewed a nd all mangrove crab farms in the District were
o b served with respect to their rearing practice and economic
aspect s , including marketing .
Two pond experimental studies on survival and growth
of Surat Thani a nd Ranong (imported ) crabs were conducted f or
2 8 days and 15 days , respectively. During these periods, ma l e
crabs gained flesh we ight and reached the pre- multistage
females developed full y ripe (pre- spawning) ovaries. The value
o f the fattened crabs increased to a bout 2-3 times that of
post - mounting stage thin c r a bs. A low percent weight gain of
8.13% for Ranong crabs and 13.21 % f or Surat Thani crabs was
obtain e d . The extrapolated gross yields obtained from the study
we r e 6,320 kg /ha / crop a nd 1,850 kg /ha/crop for Surat Thani and
Ranong crabs respectively.
ยท Rearing of imported Ranong crab s in Surat Thani produced
some problems of lower survival rate ,more aggressive
behaviour, high s toc king cost and low price and small size. The
major constraints on crab culture in Surat are (a ) seed supply;
(b) price and marketing control by middlemen; (c ) high cost of
investment; (d) greater attractiveness of prawn farming. Based
on the experimental results , Surat Thani crab s can provide the
farmer with 2
a good gross income of 25 , 286 Baht/crop (profit
20 . 05 Bah t/m ) , but the equivalent income of 19,3~7 Baht/crop
from Ranong crabs would give a loss o f - 6.17 Baht/m . |
| Year | 1988 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Machintosh, Donald J.
|
| Examination Committee(s) | Edwards, Peter ; Wee, Kok Leong
|
| Scholarship Donor(s) | Japan |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1988 |