outbreaks causing mass mortalities have been observed in the golden grey mullet (liza auratus) population in southern coastal area of the caspian sea since 2002. the clinical signs include neurological abnormalities, such as erratic swimming behavior, spiral swimming, belly-up at rest and over inflation of the swim bladder. three hundred and twelve samples of moribund fish with sizes that range...

Background: Contagion of aquatic ecosystems to heavy metals especially mercury (Hg) has risen concerns about healthiness of marine organisms. Organic mercury compounds are highly toxic for animals, and its detection in various samples is frequently needed. In present study we have described a new method for measurement of organic mercury and total mercury concentration in great cormorants (ph...

ebria tripartita (schumann) lemmermann, 1899, a non-photosynthetic flagellate was identified from the southern coast of the caspian sea in december 2012. water temperature at the sampling time was 10 ºc.  the abundance of total phytoplankton cells was 3 × 106 cells.l-1, while e. tripartita with 2 × 10 3 cells. l-1 included 0.75% of phytoplankton community. water quality parameters were recorded...

Russia and western Asia harbour trout populations that have been classified as distinct species and subspecies, most often on the basis of morphological and ecological variation. In order to assess their origins and to verify whether traditional taxonomy reflects their evolutionary distinctiveness, we documented their genetic relationships on the basis of mitochondrial DNA (mtDNA) RFLP, mtDNA s...

based on molecular and morphological characters. – Hydro-biologia 544: 89–141. (Crustacea, Mysida): history of continental invasions inferred from molecular and morphological data. – Cladistics 21: 575–596. IV Audzijonytė, A. & Väinölä, R. 2005: Phylogeographic analyses of a circum-arctic coastal and of a boreal lacustrine mysid crustacean, and evidence of fast post-glacial mtDNA rates. – (subm...

this study conducted to provide the status of parasite communities of four sturgeon species viz. acipenser stellatus , a. gueldenstaedtii , a. nudiventris , and huso huso in the southwest of the caspian sea and their histopathological effects on the examined fishes. for this purpose a total of 93 individuals of four sturgeon species were caught in two fisheries regions from the southwest of the...

in this research work the classification of the southern coasts of the caspian sea is performed using sedimentary and morphodynamic indices. this includes field study of morphodynamic characteristics of the shore structures. field measurements include in situ samplings of sediments and actual observations of structures on site. these field activities were done along six transects in the dry coa...

Bioaccumulation of Cu, Zn, Hg in muscles and liver tissues of stellate sturgeon (Acipenser stellatus) from the southern Caspian Sea was measured. Effects of condition factor (CF), age and hepatosomatic index (HSI) on metal accumulation were also determined. Some 40 stellate sturgeons were collected using gill nets in winter and spring 2007-2008 from the southern shores of the Caspian Sea. Total...

The aim of this study was to investigate the interaction between fish cage culture and sediment bacterial contamination in the area southern of Caspian Sea. For this purpose, sampling of sediment was collected in Mazandaran province (Nowshahr region) during the rainbow trout farming period at different distances (shadow, 200 and 1000 m from the cage) in 2017-2018. The results showed that in the...

Anzali Wetland as a listed habitat in Montreux Record, was investigated for the mammal fauna during Jan. 2015 - Jan. 2016. About 165 km of water bodies and 200 km around Anzali Wetland were patrolled, respectively. By applying different methods, such as direct observation, different signs recording, using different sampling traps, nets and camera traps, twenty mammal species were identified fro...