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Showing 2 results for Alizadeh Sabet
H.r. Alizadeh Sabet , M.r. Kalbassi , M. Pourkazemi , M. Sadeghizadeh,
Volume 25, Issue 1 (4-2016)
Abstract
Out of considerable environmental factors, temperature and its possible effects on life stages of Caspian trout investigated by natural incubation (8 ͦC) condition simulation comparing with cold (4 ͦC) and warm (12 ͦC) constant incubation temperatures in 3 well equipped incubators by water recycling systems. Green eggs triple treatments of wild and F1 cultured brooders were incubated. Incubation implemented in dark by using REDD water and DO–pH –temperature digital monitoring ended to yolk sac absorption and entering larval stage. Numbers and diameters of white fiber muscles measured and significant differences considered between three thermal treatments (P<0.05) in both wild and cultured stocks. The numbers of white fiber muscles in warm treatment by highest means (72.54) and lowest diameter (8.46 micrometer) compared with Cold treatment white fiber muscles diameter (20.59 micrometer) and numbers (50.72) which were the highest diameter and lowest numbers means between treatments. Hatching success stated considerable mortality for cold treatments and 8°C incubator improved the best temperature in wild treatment. Incubation temperature induced significant effect on white fiber muscles stated considerable index for flesh precursor muscles condition which is subject of natural stocks rehabilitation and domestication projects considerations.
M. Tavol Koteri, H.r. Alizadeh Sabet,
Volume 27, Issue 6 (3-2019)
Abstract
Considering the importance of estuaries as sensitive ecological areas and temporary habitat of many aquatic animals and also importance of Chironomidae larvae in the food chain and fish feeding, density and distribution of the chironomid larval and their relationship with environmental factors in Cheshmeh Kileh estuary of Tonekabon (South Caspian Sea basin) were investigated. Bimonthly from November 2014 to September 2015, in three stations (S1 in the river environment, S2 in estuary environment and S3 in the marine environment) samples were collected using Van Veen grab (0.03 m2) and Surber (0.1 m2, 0.2 mm-mesh size) with three replicates. Environmental factors of water including temperature and salinity and sediment relevant factors such as grain size and total organic matter percentage (TOM) were measured. In the present study, three subfamilies were identified, including Chironominae (5 genera), Orthocladinae (4 genera) and Tanypodinae (1 genera). 10 genera were reported from the river and estuary of cheshmeh Kileh for the first time. Among identified genera, the highest and lowest average densities were related to Orthocladius (235 ind. m-2) and Eukiefferiella (45.5 ind. m-2), respectively. Results of monthly distribution showed that the highest and lowest densities of chironomid larval were in March (320±133 ind. m-2) and in September (33.3±11 ind. m-2) respectively which were significantly different, by Duncan's test (p<0.05). Among sampling stations, river station (S1) showed higher density (248.3±93.6 ind. m-2) than estuary station (S2) (90.5±29.6 ind. m-2) and marine station (S3) (0±0 ind. m-2) which were significantly different (p<0.05). A significant Pearson correlation (p<0.05) between the density of chironomid larvae and environmental factors of water and sediment was found.
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