ScienceAsia 13 (1987): 159-167 |doi: 10.2306/scienceasia1513-1874.1987.13.159

ACUTE TOXICITY OF THE SYNERGISM OF SURFACTANT (LAS) AND COPPER ON THE FRESHWATER FISH, PUNTIUS GONIONOTUS, BLEEKER.

CHALIDA JANGCHUDJAI^a, E. SUCHART UPATHAM,^a MAITREE DUANGSAWASDI^b and PAKIT KlRAVANICH^c

ABSTRACT: Acute toxicities of linear alkylbenzime sulphonate (LAS) and copper on the freshwater fish. Puntius gonionotus Bleeker, were different. with the 96-h LC₅₀ values as 5.88 (5.68-6.08) mg/l MBAS .and 91.96 (79.45-106.45) g/l. respectively. The toxicity of copper varied considerably according to concentration and exposure time. but for LAS, it depended on concentration and initial exposure time. The mixtures of LAS and copper were synergistic with each other in all toxicity ratios tested. The 96-h LC₅₀ values for 1:1, 1:2 and 2: 1 toxicity ratios were 0.53 (0.35-0.80), 0.36 (0.24-0.55) and 0.49 (0.32-0. 77) toxic units. respectively, which exhibited more-than-additive effects. The acute toxicity of each toxicity ratio did not differ significantly, but the mode of action of each was influenced by the proportion of the LAS and copper in the mixed solution.

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a Department of Biology, Faculty of Science, Mahidol University. Bangkok, Thailand
b National Inland Fisheries Institute. Ministry of Agricultre and Co-operative. Bangkok, Thailand
c National Environment Board, Ministry of Science. Technology and Energy. Bangkok. Thailand

Received 5 June 1987