a systematic parasitological examination was carried out on 266 freshwater fish speci-mens, belonging to 11 species, from northwest of iran during the period from summer 2001 to summer 2002. twelve parasite species including diplostomum spathaceum, al-locreadium isoporum, ligula intestinalis, digrama sp., caryophylleus laticeps, rhabdocona hellichi, eustrongylides excisus, argulus foliaceus, la...

The monitoring of river discharge is vital for the correct management water resources. Flat-V gauging weirs are facilities used worldwide measuring discharge. These structures consist a small weir with triangular cross-section and flat “V”-shaped notch. Their extensive use consequence their utility in measurement both low high flow conditions. However, depending on size, local morphology can ac...

Most freshwater fish need to move freely through rivers complete their life cycles. Thus, river barriers (e.g. dams, culverts and gauging stations) may delay, hinder or even block longitudinal movements, affecting conservation. The most widespread solution allow upstream migration are fishways, whereas downstream is basically facilitated spillways, turbines specific solutions such as bypass sys...