03091nam a2200385 4500 20260818084327.0 130598 th eng .b11589760 AIT Thesis no.AE-96-23 Pham Van Nho Comparison of the reproductive performance of three strains of Nile tilapia (Oreochromis niloticus) Bangkok : Asian Institute of Technology, 1996 75 leaves + 1 online resource Thesis ; no. AE-96-23 A thesis submitted in partial fulfillment of the requirement for the degree of Master of Science Thesis (M.Sc.) - Asian Institute of Technology, 1996 An 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. Nile tilapia Little, David C., Chairperson Edwards, Peter, Examination Committee Yakupitiyage, Amararatne, Examination Committee DANIDA, Scholarship donor Asian Institute of Technology. Thesis ; no. AE-96-23 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B14568 .b11589760 mnait v 240329 0 970320 m a v 0 mnait mnarc 22 40 Barcode : 30050120577225 CREATED : 2013-11-22 RECORD # : i12748651 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120372684 CREATED : 2016-02-06 RECORD # : i1301156x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 20043 20043 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.AE-96-23 30050120577225 2026-08-18 08:43:27 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.AE-96-23 30050120372684 2026-08-18 08:43:27 2026-08-18 40