health assessment of khuzestan coastal and creeks area using BOPA & BOPA-m indices.

Ecological health is the most important component of the biological health. Macrobenthos invertebrate are the most important organisms in aquatic ecosystems that are used for determination of biological health. Benthic indices base bye data simplifying and shows a set of biological variable as a quantified variable that made the interpretation of data easier، one of this indices is BOPA index that give from ratio of opportunistic Polychaeta to Amphipoda. The higher value of this index shows environmental pollution. The value of BOPA index showed significant difference between stations.