Toxic and sublethal effects of endosulfan and carbaryl on growth and egg production of Moina micrura Kurz (Cladocera: Moinidae)

The toxic and sublethal effects of endosulfan and carbaryl on a cladoceran, Moina micrura, were studied. The dosage-mortality regression lines gave LC(50) values for the pesticides. The cumulative growth and egg production during life were inhibited to 31.8 and 20.7% in endosulfan, and 28.2 and 13.7% in carbaryl-treated animals, respectively. The growth coefficient (K value) and the intrinsic rate of natural increase per day (r value) of control M. micrura were 0.144 and 0.377, respectively; these decreased to 0.121 and 0.346 in carbaryl-, and 0.073 and 0.356 in endosulfan-treated animals, respectively.