this study was conducted to determine taxonomic and zoogeographic features of fishes from the kor and helleh river basins in southwestern iran. the specimens were collected from 2004 to 2007. twenty four species belonging to 20 genera, 9 families, and 6 orders from the kor river basin and 21 species belonging to 19 genera, 8 families, and 6 orders from helleh basin were identified. ichthyofauna...

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...

the native fishes of iran are imp ortant, since the stock of population are declining and the species of some fishes are in danger , because of industrialization, pollution, dryness, purposeful or accidental introduction of exotic species. the inland water species of iran are import ant, since they have not been yet completely identified. in order to conduct taxonomic revision and survey of pop...

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...