An Chuanpid Thongkum creator Machintosh, Donald J. Chairpeson Edwards, Peter Examination Committee Wee, Kok Leong Examination Committee Japan Examination Committee text series technical report th Bangkok Asian Institute of Technology 1988 continuing eng 111 p. 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 . 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 Crab culture Thailand Surat Thani Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B18934 http://203.159.5.9/ait-thesis/detail.php?q=B18934 110920 20260817163613.0