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008			130598 th eng
035			_a.b11589760
099		9	_aAIT Thesis no.AE-96-23
100	0		_aPham Van Nho
245	1	0	_aComparison of the reproductive performance of three strains of Nile tilapia (Oreochromis niloticus)
260			_aBangkok : _bAsian Institute of Technology, _c1996
300			_a75 leaves + _e1 online resource
490	1		_aThesis ; _vno. AE-96-23
500			_aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Science
502			_aThesis (M.Sc.) - Asian Institute of Technology, 1996
520			_aAn experiment (experiment 1) compared performance of yearling (> 1<2) Nile tilapia broodfish of two strains (GIFT and AIT) showed no differences. Fish (density 30 fish/hapa) were allowed to spawn naturally in triplicate 20 m2 hapas suspended in the same earthen pond. Seed was harvested every 5 days over a period of 12 weeks by checking individual female fish before returning them to the same hapa. Fecundity and relative fecundity were not significantly different (P<0.05), despite GIFT fish being larger throughout the experiment due to different pre-experimental history. Total seed harvested and frequency of spawning declined throughout the experiment despite water quality being maintained at suitable levels. Samples of seed retained for estimation of quality indicated no differences in viability, hatching and survival to the yolk-sac absorbed stage (5 day old). A further two trials compared the reproductive performance of known age (5 months) GIFT and AIT broodfish (experiment 2) and known age (5 months) GIFT, AIT and Swansea broodfish (experiment 3). Both experiments were run over the same period, allowing broodfish to spawn in single pair in 1 m2 hapas suspended in the same pond. Around 50 % of all three strains were mature within 150 days but no spawning occurred within this time. The lack of spawning, despite suitable early morning dissolved oxygen, may have been linked to high levels of silt in the pond water.
650	1	0	_aNile tilapia
700	1		_aLittle, David C., _eChairperson
700	1		_aEdwards, Peter, _eExamination Committee
700	1		_aYakupitiyage, Amararatne, _eExamination Committee
710	2		_aDANIDA, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. AE-96-23
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B14568
907			_a.b11589760 _bmnait _cv
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