TY  - SER
AU  - Chuanpid Thongkum
AU  - Machintosh,Donald J.
AU  - Edwards,Peter
AU  - Wee,Kok Leong
ED  - Japan, 
TI  - An assessment of mangrove crab (scylla serrata) culture in ponds in Surat Thani
T2  - Thesis
PY  - 1988///
CY  - Bangkok
PB  - Asian Institute of Technology
KW  - Crab culture
KW  - Thailand
KW  - Surat Thani
N1  - A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development; Thesis (M.Sc.) - Asian Institute of Technology, 1988
N2  - 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.  · 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
UR  - http://203.159.5.9/ait-thesis/detail.php?q=B18934
ER  -