Moina macrocopa, one of zooplanktons, is widely distributed
in ponds and rice fields of Southeast Asia. It is
sensitive to pollutants, such as heavy metals (Wong 1993)
and organophosphate insecticides (Wong et al. 1995).
Existence of endosulfan in the aquatic environment may
affect its survival, reproduction and physical changes.
Since zooplanktons are important links in the aquatic food
chain, toxicants affecting the populations would have
indirect effects on their predators and preys, thereby
causing changes at the community and ecosystem levels
eventually (Chu et al. 1997). Thus, the objectives of this
study were to determine acute and chronic effects of
endosulfan on survival and reproduction of M. macrocopa.