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035 _a.b10151886
099 9 _aAIT Thesis no. AE-94-45
100 0 _aSomboon
245 1 2 _aA comparison of different species ratios in the nursing of three species of freshwater fish in nylon hapas suspended in earthen ponds
260 _aBangkok :
_bAsian Institute of Technology,
_c1994
300 _a113 leaves
490 1 _aThesis ;
_vno. AE-94-45
500 _aA thesis submitted in partial fulfillment of the requirements of the degree of Master of Science, School of Environment, Resources & Development
502 _aThesis (M.Sc.) - Asian Institute of Technology, 1994
520 _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 nursingĀ· 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.
650 0 _aFish-culture
700 1 _aLittle, David C.,
_eChairperson
700 1 _aEdwards, Peter,
_eExamination Committee
700 1 _aYakupitiyage, Amararatne,
_eExamination Committee
710 2 _aThe Government of Germany (DAAD),
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. AE-94-45
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B15598
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