Abstract:

Mercury concentrations in fish from Thai reservoirs were studied to determine if the presence of mercury constitutes a problem in such tropical reservoirs. Fish were collected from three sties located in the Mae Klong River Basin (about 100 km west of Bangkok): 1. the Khao Laem Reservoir (a reservoir impounded five years ago); 2. the Srinakarin Reservoir (a reservoir impounded 10 years ago); 3. the area proposed for the Nam Choan Reservoir.
Fish in the Khao Laem and Srinakarin Reservoirs contained higher mercury levels than fish in the Nam Choan area. Mercury levels in some of the fish from the (older) Srinakarin reservoir were lower than fish from the (younger) Khao Laem Reservoir. We conclude that mercury levels in tropical reservoirs may be elevated for shorter periods of time than in temperate and subarctic reservoirs.

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Date 1993/06/01

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