02108nam a2200241   450000500170000000800410001703500150005810000120007324501380008526000520022330000150027549000270029050001510031750200570046852010110052565000170153670000350155370000430158870000530163171000580168481000590174285600650180120260817173434.0080598         th                  eng    a.b101518860 aSomboon12aA comparison of different species ratios in the nursing of three species of freshwater fish in nylon hapas suspended in earthen ponds  aBangkok :bAsian Institute of Technology,c1994  a113 leaves1 aThesis ;vno. AE-94-45  aA thesis submitted in partial fulfillment of the requirements of  the degree of Master of Science, School of Environment, Resources & Development   aThesis (M.Sc.) - Asian Institute of Technology, 1994  aThe use of rice bran as a supplementary food for nursing polycultures and  monocultures of Nile tilapi a, common carp and silver barb fry in hap as was  compared to the use of fertilizer alone. Human waste in a form of septage was  used as organic fertilizer at the rate of 150 ltg COD ha day .  Survival to 8 weeks of all species combinations, except the tilapia  monoculture, was very poor and high variable. Survival to 4 weeks was good for  all treatments but water quality, possibly exacerbated by bird predation,  subsequently reduced survival of common carp and silver barb. Poor survival  was correlated with low dissolved oxygen in the early morning to the most  sensitive species, the silver barb.  Use of septage at these rates is probably too high for nursing· carps in  monoculture or polyculture but not Nile tilapia. The high tolerance of Nile  tilapia to low, early morning dissolved oxygen was also indicated by the high  survival and production of cleaner fish stocked outside the hapas. 0aFish-culture1 aLittle, David C.,eChairperson1 aEdwards, Peter,eExamination Committee1 aYakupitiyage, Amararatne,eExamination Committee2 aThe Government of Germany (DAAD), eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. AE-94-45  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B15598