Srirat Sodsook creator Little, David C. Chairperson Machintosh, Donald J. Examintion Committee Knud-Hansen, Christopher F. Examination Committee Canadian International Development Agency (CIDA ) Scholarship Donor text series technical report th Bangkok Asian Institute of Technology 1989 continuing eng 100 p. Nursing methods of juveniles fish in nylon hapas in pond was conducted both on-campus trials in AIT a n d on-farm trials in Udonthani Province , N.E. Thailand. The first experiment on-campus compared nursing juveniles in 4 0 m2 nylon hapas 2 stocking densities of common carp ( Cyp.ri1111s carpio ) , 7 5 a nd 1 50 /m 2, a nd polyculture with MT - treated tilapia ( Oreochromis niloticus ) at 75 /m2 each . Th e second trial determined both the appropriate stocking density of common carp fry i n polyculture with MT- treated tilapia in 5.4 m2 nylon hapas at 150 and 300 /m2, and the appropriate ratio of MT-treated tilapia and common carp at 1:1 , 2:1 , and 4:1 respectively. On-farm trials were conducted in Kumpawapi district, Udonthani Province to develop appropriate methods of nursing juvenile fish in nylon hapas for s mall- scale farmers. The first experiment, showed t h at t h e growth of MT- treated tilapia increased very fast, from an initial weight of 0.19 g to 12 . 89 g within 13 weeks , but s lowly for common carp . The final size of commo n carp fingerling showed highly significant differences between ( P<0.01 ) treatment. The highest mean individual weigh t was obtained from low stocking density ( 3. 26 g ) , followed by polyculture (2.65 g ) and high density monoculture (2.13 g ) respectively. I n the second experiment , a high stocking density of MT - treated tilapia and common carp showed significantly (P<0. 01 ) lower growth t h an a J. ow stocking, but there ratio h ad no significant effect. Juveniles nursed on farms, in a variety of polycultures , showed very fast growth and high survival in all cases . Concentration of dissolved oxygen and the presense or absense of fish outside the hapas may have affected growth and survival of fish fingerlings especially common carp. A thesis submitted in partial fulfillment of the requirement for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 1989 Fish-culture Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B17887 http://203.159.5.9/ait-thesis/detail.php?q=B17887 110920 20260818170314.0