Delayed effects of daphnia intoxication with selective and nonselective inhibitors of acetylcholinesterase.

Chronic experiments on successive generations of laboratory Daphnia magna culture demonstrated higher (compared to proserin) embryotoxicity of a new selective acetylcholinesterase inhibitor 1,3-bis[5-(diethyl-o-nitrobenzilammonio)pentyl]-6-methyluracyl dibromide (compound No. 547). The concentrations of proserin (neostigmine) and compound No. 547 not exceeding 1/60 LC50 (0.39 mol/liter for compound No. 547 and 0.045 mol/liter for proserin) were absolutely safe for the reproductive function of daphnia.