the present study investigates the effects of water temperature on digestive enzymes activity and food transit time in caspian kutum ( rutilus kutum ) larvae. caspian kutum larvae (532 ± 0.05 and 543 ± 0.02 mg) were divided into two groups with three replicates and reared at different water temperature i.e. 25.6 ± 0.4°c (t 1 ) and 18.4 ± 0.1°c (t 2 ). at the end of the experiment, sampling of i...

  Six different diets including two rainbow trout starters, Gammarus dry powder, shrimp dry powder, egg yolk dry powder and newly hatched Artemia were used in feeding of Caspian Kutum larvae. During a 4-week trial, larvae with a mean weight of 17.5 ± 4.7 mg were fed with three replicates and growth parameters were measured at the end of the experiment. Thirty fish in each experimental unit with...

fish genome contains two copies of growth hormone (gh-1 and gh-2) as a result of duplication process during evolution. the aim of this study was to distinguish gh-1 from gh-2 genes in rutilus kutum (mahi sefid) from the caspian sea using sequencing techniques and application of specific restriction enzymes for these loci. for this purpose, five fish were randomly selected and samples for dna ex...

Since the 1990s, anthropogenic activities have been major direct or indirect threats to structural and functional organization of unique ecosystem Caspian Sea (CS). This study attempts investigate relationships between fish community structure environmental parameters analyze Abundance Biomass Comparison (ABC) in CS. The input data, including catch data by species parameters, were collected fro...

Kutum is considered as one of the anadramous species of the Caspian Sea. Due to continuous population decline of the fish since 1975, Iranian fisheries organization started to restock this species. Nowadays, there is growing concern over the effects of restocking on natural populations. For this purpose, population structure and genetic variation of this species in the Iranian coastline of Casp...

  Mahisefid is the most popular fish in Iran with the highest economic value. The analysis of mitochondrial DNA has been extensively used as a marker for population genetic studies and is a powerful tool in studies of gene flow and evolutionary biology. Two hundred ninety four samples were collected from Sefid Rud River (100), Lamir River (98), Shir Rud River (48) and Tajan River (48) during s...