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008			110920s1988 th uu|m rtt 0| a1eng d
035			_a.b10071180
099		9	_aAIT Thesis no.AE-88-33
100	0		_aChuanpid Thongkum
245	1	3	_aAn assessment of mangrove crab (scylla serrata) culture in ponds in Surat Thani
260			_aBangkok : _bAsian Institute of Technology, _c1988
300			_a111 p.
490	1		_aThesis ; _vno. AE-88-33
500			_aA thesis submitted in partial 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, 1988
520			_aThe 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 .
650		0	_aCrab culture _zThailand _zSurat Thani
700	1		_aMachintosh, Donald J., _eChairpeson
700	1		_aEdwards, Peter, _eExamination Committee
700	1		_aWee, Kok Leong, _eExamination Committee
710	2		_aJapan, _eExamination Committee
810	2		_aAsian Institute of Technology. _tThesis ; _vno. AE-88-33
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B18934
907			_a.b10071180 _bmnait _cs
902			_a240409
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