Abstract.
Behavioural changes of medaka (Oryzias latipes) treated with an anticholinesterase insecticide, diazinon (0.1 mg L- 1), were continuously observed for 4 days in semi-natural conditions. Although variations occurred in individual specimens, the movement tracks appeared differently with typical short-range movement with irregular turns and shaking after the treatments. Eight movement patterns frequently observed before and after the treatments were selected, and the variables characterising the movement patterns were compared quantitatively. The variables were clearly differentiated when the movement patterns were correspondingly matched before and after the treatments (e.g., vertical movements, horizontal movements, etc). Meander and stop duration were highly different among the selected movement patterns. Additionally, different degree of toxic response behaviours could also be detected by quantitative characterisation of the variables. Response behaviour was confirmed with toxicological experiments that show the decrease in the acetylcholine esterase activity in the head and body of specimens. Quantitative investigations on the variables of the movement tracks suggested the usefulness of response behaviour as a monitoring tool for environmental assessment.
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CHON, TS., CHUNG, N., KWAK, IS. et al. MOVEMENT BEHAVIOUR OF MEDAKA (Oryzias latipes) IN RESPONSE TO SUBLETHAL TREATMENTS OF DIAZINON AND CHOLINESTERASE ACTIVITY IN SEMI-NATURAL CONDITIONS. Environ Monit Assess 101, 1–21 (2005). https://doi.org/10.1007/s10661-005-9125-1
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DOI: https://doi.org/10.1007/s10661-005-9125-1