Malaysian Applied Biology Journal

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Malays. Appl. Biol. (1997) 26(2): 63-67


A.S.C. CHONG, K. H. KHOO and A. B. ALI*

School of Biological Sciences, Universiti Sains Malaysia 11800, Minden, Penang, Malaysia


The toxicity of alphacypermethrin, a persistent pyrethroid was tested against juveniles of five fish species, Poecilia reticulata, Brachydanio rerio, Clarias gariepinus, Channa striata and Oreochromis sp., using a 96 hours standard laboratory exposure method. The intermediate lethal dose (LC) values obtained for B. rerio (LC50= 8.18 mg/L) and Oreochromis sp. (LC50 = 50.56 mg/L) indicated the suitability of the two species as standard reference fishes for pesticide toxicity studies. C. gariepinus (LC50 = 5.44 mg/L) was most susceptible towards alphacypermethrin while C. striata (LC50 = 655.09 mg/L] showed the highest tolerance. The overall results showed that alphacypermethrin generally displayed acute toxicity towards fishes and the possibility of field contamination is discussed here.


Ketoksikan alphacypermethrin, sejenis pyretroid tahan lama telah dikaji ke atas juvenil lima spesies ikan, Poecilia reticulata, Brachydanio rerio, Clarias gariepinus, Channa striata and Oreochromis sp. menggunakan kaedah piawai makmai dengar pendedahan selama 96 jam. Nilai dos maut pertengahan didapati untuk B. rerio (LC50 = 8.18 mg/L) and Oreochromis sp. [LC50 = 50.56 mg/L) menunjukkan kesesuaian kedua-dua spesies sebagai ikan rujukan piawai untuk kajian ketoksikar pestisid. C. gariepinus (LC50 = 5.44 mg/L) paling rentan terhadap alphacypermethin sementara C. striata (LC50 = 655.OS mg/L) menunjukkan ketahanan yang paling tinggi. Keputusan keseluruhan juga menunjukkan bahawa alphacypermethrir secara umumnya amat beracun terhadap ikan dan kemungkinan pencemaran di lapangan dibincangkan.

Key words: Acute toxicity, alphacypermethrin, juvenile fishes


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