Insects with over 30,000 aquatic species are known as very successful arthropods in
freshwater habitats. Some of them are applied as biological indicators for water quality
control, as well as the main food supply for fishes and amphibians. The faunistic studies are
the basic step in entomological researches; the current study was carried out emphasizing
on the fauna of aquatic insects in Karaj River, northern Iran. A field study was carried out in
six various sampling site of Karaj River during spring 2013. The aquatic insects were …