The effect of sublethal concentration of Decis 2.5 EC pesticide on learning and memory processes in common carp, Cyprinus carpio (Actinopterygii: Cypriniformes: Cyprinidae)

How exposure of fish to a pyrethroid deltamethrin (an active ingredient in Decis 2.5 EC pesticide that disturbs the proper operation of the nervous system) affects the ability to learn in common carp, Cyprinus carpio? The experiment was performed in a tank divided into two compartments where fish could swim freely from one compartment to another. Electric impulse and light were used to study behaviour of fish. The ability to learn was assessed on the basis of the following types of behaviour evoked in response to the conditioned stimulus: locomotor agitation, preference to occupy or avoid certain areas in the tank, an escape response, etc. In fish exposed to 0.35 μg in L deltamethrin (for common carp concentration 10 times lower than lethal) for 35 minthe ability to produce and remember the conditioned defence response was reduced and time interval since presenting the conditioned stimulus till occurring the initial signs of the conditioned response was prolonged