Monitoring the quality of surface water against pollution can be done in various ways, one of which uses organisms as bioindicators. Segara Anakan is an estuarine ecosystem that has the potential to contain contamination carried along the river flow. Macrozoobenthos is one of the organisms that is rightly used as a bioindicator of pollution in the environment. The structure of the macrozoobenthos in Segara Anakan has undergone a change as indicated by the diversity and abundance of low species. Meanwhile, environmental parameters, such as heavy metals in detected sediments are quite high. The concentration of heavy metals varied, namely Hg, Pb, Cd and Cr with the average concentration respectively as follows: 0.04; 4.4; 1,2 and 1,4 ppm. In general, the low abundance of macrozoobenthos was found in stations with high heavy metal content. This shows that there has been heavy metal pollution in Segara Anakan.

bioindicator, diversity, pollution, macrozoobenthos, segara anakan