02254nam a2200253   450000500170000000800410001703500150005810000210007324500590009426000520015330000110020549000230021650001620023950200580040152011620045965000270162165000500164870000340169870000390173270000480177171000610181981000550188085600650193520260817161857.0240998s1978    th      r    0000|0 eng d  a.b100597021 aJuang, Po-hsiung10aAgricultural chemicals and fish production in Thailand  aBangkok :bAsian Institute of Technology,c1978  a105 p.1 aThesis ;vno. 1394  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand  aThesis (M.Eng.) - Asian Institute of Technology, 1978  aTilapia is a famous tropical fish which may be cultured in vegetable irrigation ditches to use the waste matter for food. Routine agricultural chemical activities on those vegetable farms for pest control have shown distinct effects on Tilapia production. Azodrin (organophosphate pesticide)  sprayed in one vegetable farm studied in this thesis led to high azodrin residue accumulations of 1.011 ppm and 0.837 ppm for Tilapia mossambica and Tilapia nilotica, respectively. The rapid decomposition of azodrin within three weeks after spraying, however, may give the users such confidence that azodrin has advantages both for agriculture and fisheries if a vegetable and fish harvest can be made at the same time. Chlorinated hydrocarbon pesticides were examined, but very low concentration were present which apparently did not do any damage on fish. Perhaps  the cool and rainy season from September to December in Thailand greatly lowers the toxicity of pesticides on fish.  "Mono-sex" culture of male Tilapia production in 3.5 months reached 3269 kg/ha and 2808 kg/ha for T.nilotica and T.mossambica, respectively  where the above chemicals were sampled. 0aFish-culturexThailand 0aAgricultural chemicalsxEnvironmental aspects1 aEdwards, Peter, eChairperson0 aSamorn Muttamara, eCo-Chairperson1 aNguyen, Cong Thanh, eExamination Committee2 aGovernment of the Republic of China, eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. 1394  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B23093