000			03695cas a2200421 a 4500
005			20260818094947.0
008			111005s1990 th uu|m rtt 0| a1eng d
035			_a.b1022726x
099		9	_aAIT Thesis no. AE-90-33
100	1		_aAmbali, Aggrey J. D.
245	1	0	_aEffect of hapa size on conditioning of broodstock Oreochromis niloticus in fertilized earthen ponds
260			_aBangkok : _bAsian Institute of Technology, _c1990
300			_a102 p.
490	1		_aThesis ; _vno. AE-90-33
500			_aA thesis submitted in partial fulfillment requirements for the degree of Master of Science, School of Environment, Resources and Development
502			_aThesis (M.Sc.) - Asian Institute of Technology, 1990
520			_aThe study was carried out to determine the effect of manipulating hapa size during conditioning period of female Oreochromis niloticus brood stock in fertilized earthen pond on seed production. An equal biomass of female brood fish was stocked during conditioning in each of three different sized hapas, a) 2. 72m2(High density) b) 5.29m2(Medium density) and c ) 10.78m2(Low density). The stocked biomass\m2 was 0.Gkg ; 1.2-1 . 4kg and 2 . 3-2 . 5kg for low, medium and high stocking density respectively. After a period of 10 day conditioning, females were stocked in 40m~ hapas at a stocking ratio of 1:1 and allowed to spawn naturally over a period of 5 days. No significant difference in seed yield were recorded, treatments exceeded 3000 seed\kg female spawned per month 40x10 per total ha pond area. but and There was a positive response to the use of conditioned males for 5 days prior to spawning on seed production. Females stocked with conditioned males produced seed exceeding 8200 per kg females spawned while those stocked with unconditioned males produced less than 8200 seed per kg female spawned . The mean clutch size was significantly(p<0 . 05) higher in the low density treatments compared to the other two treatments 1042, 804 and 839 seed\female for low, medium a nd high densities respectively. However relative clutch size was not significantly different(p>0.05) among the three treatments 9, 9, 8 seed\g female for low, medium and high density treatments . Water quality deteriorated during day 45 to 60 of the experimental period when dissolved oxygen concentration was lower than 0.5mg\l in the conditioning heparin the morning. Decline in water quality coincided with drop in seed production .
650		0	_aTilapia
650		0	_aFishes _xReproduction
700	1		_aLittle, David C., _eChairperson
700	1		_aMachintosh, Donald J., _eExamination Committee
700	1		_aYakupitiyage, Amararatne, _eExamination Committee
710	2		_aICLARM\GTZ, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. AE-90-33
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B18266
907			_a.b1022726x _bmnait _cs
902			_a240329
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