The experiments with Beroe ovata showed that this ctenophore can survive and reproduce in the Caspian Sea water, though at far lower rate than in the Black Sea; larval growth in the Caspian Sea water was also slower and mortality higher. Maximum fecundity of 2210 and 240 eggs recorded in laboratories of Turkey and Iran, respectively. About 34 to 100% of eggs in the Caspian Sea water could not d...

abstract the overall focus of the caspian sea security is shaped in four geopolitical areas contain the caucasus,(azerbaijan), central asia( turkmenistan and kazakhstan), russia,( ussr) a political unit in the international system which is one of the largest exporters of oil and gas in the north, and iran with huge reserves of oil and gas and oil industries in the south,. these important geopol...

the populations of wild carp (cyprinus carpio carpio), as a commercially valuable species in the southeast iranian waters of the caspian sea, have been severely declined during last three decades, but there is no comprehensive research available on the biology of this species in this area. the age, growth and reproductive aspects of samples collected during 2009-2010 fishing season were measure...

alburnus chalcoides , caspian shemaya, is found in the river systems of the aral, black and caspian sea basins and is an economically valuable cyprinid from the southern caspian sea. this species has been reported as near threatened species in this basin due to damming, over and illegal fishing, destruction of its spawning grounds and water pollution. the caspian shemaya is an important species...

abstract: after the collapse of the soviet :union:, and the geopolitical changes in the region, which caused emergence of four new states, the outlook to the caspian sea and it's issues have changed. dealing with numerouse oil contracts with multinational companies and the entrance of transnational states and organizations, aggrevated the political and economic competitions and increased t...

a total of 48 female spirlins alburnoides sp. from the kesselian stream (south caspian sea basin, northern iran) were examined during a period from july 2008 to june 2009 to obtain data on fecundity, and to determine the spawning season of this carp. the mean absolute fecundity of females spirlin was 1722.92 (653.88) eggs. the fecundity has positive correlation with the size of the female. the...

Twenty-seven species of Odonata were collected in the present survey in the freshwaters of South-Eastern Iran, Kerman province, in contrast to 11 species that were recorded previously from this region. In this study, 528 specimens were collected from more than 30 sites in Kerman province during 2006-2008. It seems that in this region due to its special biogeographic conditions, species diversit...