Comparative studies of the effect of thiourea and BHC on behaviour and mortality in adult snails of the species Lymnaea stagnalis and on their egg masses.
When adult Lymnaea stagnalis specimens were treated with aqueous thiourea and BHC solutions for up to 30 days, they displayed hyperirritability after 3 +/- 2 days, manifested in climbing behaviour at the surface of the water to avoid contact with the treated medium and to take in fresh air. They remained clinging to the wall of the container for long intervals without feeding and their feeding rate as a whole was slow throughout the experiment. Owing to decalcification the shell became thin, fragile and semi-transparent. Egg mass production by the adults increased slightly, but there were fewer egg capsules (3-8/egg mass), indicating that the fertility rate was reduced. Mortality among the adult snails was high during prolonged treatment. The egg masses were swollen and were less sticky than in the controls. None of them survived. The effects of BHC treatment were more pronounced and faster than in thiourea treatment.
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D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D001556:Hexachlorocyclohexane / Q000494:pharmacology*; D008195:Lymnaea / Q000187:drug effects* / Q000502:physiology; D010063:Ovum / Q000187:drug effects*; D013890:Thiourea / Q000494:pharmacology*
D001556:Hexachlorocyclohexane; D013890:Thiourea