| Author | Lim, Siew Yoke |
| Call Number | AIT SSPR no. 58 |
| Subject(s) | Industrial toxicology
Fishes, Fresh-water
|
| Note | A special study submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand |
| Publisher | Asian Institute of Technology |
| Abstract | Cyprius Carpio, an economically important fish in the tropic
was used to test the toxicity of 4 heavy metals, 4 pesticides and
one herbicide. The limiting D.O. for Cyprius Carpio was also investigated. All the experiments were done at constant temperature 30°C. It was found that Cu++ is very toxic to carp, the median TLm96 of Cd++
tolerance limit of 96 hours is as low as 20 ppb. zn-1+ and. Pb++ are 0. 16, 1.30, 1.05 mg/las metal respectively. Lethal concentrations after 96 hours exposure approach threshold
concentrations for zn++ and Pb-I+ toxicity, but longer period of
time is needed for cu-I+ and ca-I+ to achieve threshold concentrations. Endrin, a chlorinated hydrocarbon is the most toxic pesticide for fish. Threshold concentration for Cyprius Carpio is 0. 14 ppb.
All of the pesticides and herbicides tested (endrin, D.D.T., dieldrin parathion and 2-4 D Na Salt) approaches threshold concentration after one week of exposure . Threshold concentrations of D.D.T., dieldrin,
parathion and 2-4 D Na salt is 0.042, 0.02, 0.88 and 455 mg/l as active ingredient respectively. Chlorinated pesticides are more
toxic than organic phosphate pesticides, and herbicide is less toxic than pesticide. The limiting D.O. for Cyprius Carpio ranged from 0.8 to 1.1 mg/l in an enclosed chamber with final co2 below 30 mg/l and a decreasing
rate of D.O. of approximately 0.3 mg/1-HR. |
| Year | 1974 |
| Type | Special Study Project Report (SSPR) |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | AIT SSPR (Year <=1978) |
| Chairperson(s) | Pescod, M.B. |
| Scholarship Donor(s) | Asian Institute of Technology |
| Degree | Special Studies Project Report (M. Eng.) - Asian Institute of Technology, 1974 |
