Studies on the effect of some insecticides on certain aquaculture organisms. 2.- Degradation and distribution of decamethrin and malathion in an aquaculture eco-system

• Published in: Journal of Agricultural Research, Tanta Univ. (Egypt) Vol. 15
• Main Authors: El-Basyouni, S.A. (Tanta Univ., Kafr-El-Sheikh (Egypt). Faculty of Agriculture), Salama, M.E, Hosny, A.H
• Format: Publication
• Language: English
• Published: 01.03.1989
• Subjects: EGIPTO; EGYPTE; INSECTICIDAS; INSECTICIDE; PECES; POISSON (ANIMAL); RESIDU; RESIDUOS

Distribution and degradation of both decamethrin and malathion in an aquatic eco-system under laboratory conditions were studied. Aquariums containing soil layer, dechlorinated tap water and Clarias lazera fish were fortified with LD50 values of each compound alone and samples were taken along periods of 21 days. The highest level of residues of both compounds was obtained in water at the initial time then declined till they were undetectable, and that was after 14 and 21 days for decamethrin and malathion, respectively. In case of sediment, the first detection of residues of both compounds was reported after 12 and 24 hrs for decamethrin and malathion, respectively. However, decamethrin attained its peak so fast (after 24 hrs) then declined till it became undetectable after 14 days. On the other hand, malathion accumulated in the sediment gradually untill it reached its maximum level after 14 days then declined but still in the detectable range throughout the periods of investigation. Data also revealed that the viscera of Clarias lazera fish had a higher affinity to accumulate both compounds than muscles.