1 AIT Asian Institute of Technology

Assessment of the effects of the insecticide methyl parathion on Nile tilapia (Oreochromis niloticus) fingerling in a small-scale rice-fish culture, and on freshwater prawn juvenile (Macrobrachium rosenbergii) in tanks

AuthorNguyen Thanh Phuong
Call NumberAIT Thesis no. AE-92-28
Subject(s)Insecticides--Toxicology
Insecticides--Environmental aspects
Fish-culture--Environmental aspects

NoteA thesis presented in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development
PublisherAsian Institute of Technology
AbstractA acute bioassay was conducted to determine the toxicity of methyl parathion to Nile tilapia (Oreochromis niloticus) fingerlings (1.55 g in weight) and prawn post-larvae (Nao1·obra.chium rosenberg'ii) (0.015 g in weight). The LCso at 24 and 96 hour exposure to methyl parathion was 6.76 and 5 . 78 mg a.i./L for tilapia and 0.41 and 0.041 µg a . i . /L for prawn, respectively . The post-larvae stage of Macrobrachium rosenbergii was more sensitive to methyl parathion than tilapia fingerling. An experiment was set up in a rice field to assess the effects of methyl parathion on tilapia fingerling (1.4 2 g in weight) in a small-scale rice - fish culture system . Methyl parathion was applied at different rates (0.24, 0 . 48, 2 .4 and 4.8 mg a.i./L). At an application rate of 4.8 mg methyl parathion per liter, survival and biomass production of tilapia was significantly reduced (P <0 .01). No effects were detected at 0 . 48 mg/L or less. Fish yield was highest in control, 0.24 and 0.48 mg/L treatment, at an equivalent of 634.1, 587.4 and 415.4 kg/ha after 70 days stocking, respectively. Increase of rice yield by 13 to 30 % was recorded in all treatments with fish compared to rice fields without fish. Long- term effect of methyl parathion to Macrobrachium post - - larvae (0.12 gin weight) was investigated in a concrete-tank . Survival and biomass production of prawn were significant reduce (P<0.01) at a 4.25 and 8 . 5 µg a.i./L, applied every 10 days . No negative impact of methyl parathion to prawn at 0.21 , 0.42 and 2 . 13 µg/L, was measured in terms of survival, biomass production and growth rate. Prawn had significantly better survival rat e and yield at methyl parathion treatment of 0.213 and 0 . 425 µg/L (P<0.01).
Year1992
TypeThesis
SchoolSchool of Environment, Resources, and Development (SERD)
DepartmentDepartment of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB))
Academic Program/FoSAgricultural and Food Engineering (AE)
Chairperson(s)Phillips, Michael J.
Examination Committee(s)Knud-Hansen, Christopher F. ;Lin, Chang Kwei
Scholarship Donor(s)The King of Thailand;
DegreeThesis (M.Sc.) - Asian Institute of Technology, 1992


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