04106cas a2200421 a 4500 20260818112751.0 110920s1989 th uu|m rtt 0| a1eng d .b10260870 AIT Thesis no. AE-89-30 Marnop Chaengkij Evaluation of monosex tilapia production in ponds with different nutritional inputs Bangkok : Asian Institute of Technology, 1989 77 p. Thesis ; no. AE-89-30 A thesis submitted in partial fulfillment of the requirements for the degree of the Master o f Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 1989 Different nutritional inputs were used to culture monosex Nile tilapia ( Oreoch romisniloticus ) with the same initial. individual mean weight of 5. 1 g in 200 m2 earth ponds for eighteen weeks. Four treatments with three replications each were used with the same fish stocking rate of 600 fish/pond <1:> follows: Treatment 1 , duck/fish integration; Treatment 2, buffalo manure and inorganic fertilizers (urea and triple superphosphate) with rice bran a supplementary feed given daily a t 2% of fish bod y weight; Treatment 3 , pelleted feed given initially <1t 2%/body weight /day and later at 3% of fish body weight; Treatment 4, no nutritional inputs. Mean dissolved oxygen concentrations (DO ) fell into two groups, manure d ponds (Treatments 1 and 2 ) and unmanaged panels (Treatment 3 a nd 4 ) . DO in manured ponds was lower at dawn and higher in the after noon than in unmanaged ponds , and these trends were nearly the same level through out the experimental period . Phytoplankton and zooplankton biomass were low in unmannered ponds but high in manured ponds ; l1 owever , they were higher in ponds loaded with duck manure than buffalo manure. Treatment 1gave the best result in terms of mean growth rate, mean specific growth rate , mean individual fish weight and net fish yield followed in decreasing order by Treatment 2,3 and 4 . There was no significant differences in survival rate be t ween the treatments , except in the control treatment with only 49. 8% survival rate . Using gross margin analysis , the economic results showed that only Treatment 1 gave a positive value with the others negative . Integration of duck/fish was an not an economical method eventhough it gave the best fish yield because of the financial loss of the duck enterprise. Using pelleted feed was also an uneconomical method but it could be economic if the feed price were reduced. No pond inputs was not economic due to high mortality and poor fish growth . Only the treatment using buffalo manure , inorganic fertilizers and rice bran as pond inputs may be economic and this strategy show potential for small-sca1c farmers. Tilapia Fishes Feeding and feeds Edwards, Peter, Chairperson Lin, Chang Kwei, Examination Committee Waibel, Hermann, Examination Committee CIDA, The Government of CANADA, Scholarship Donor Asian Institute of Technology. Thesis ; no. AE-89-30 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B17881 .b10260870 mnait s 240401 2 951012 m a s 0 mnait mnait mnarc 20 40 Barcode : 30050003004263 CREATED : 1994-05-17 RECORD # : i10320738 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003004255 CREATED : 1994-05-17 RECORD # : i1032074x LPATRON : 1014439 LCHKIN : 2001-11-19 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 9 TOT RENEW : 0 Barcode : 30050120364491 CREATED : 2016-05-27 RECORD # : i1299795x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 41091 41091 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. AE-89-30 30050003004263 2026-08-18 11:27:51 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. AE-89-30 30050003004255 2026-08-18 11:27:51 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. AE-89-30 30050120364491 2026-08-18 11:27:51 2026-08-18 40