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  • Caspian Sea  (3)
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  • 1
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    The density and distribution of the dominant phytoplankton in the southern Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/23946 | 18721 | 2018-08-01 17:42:25 | 23946 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: The research project was comprised of four sampling cruises, which were carried out in summer 94; spring, autumn and winter 95 in the southern part of the Caspian Sea, where Chrysophyta (Diatoms) and Pyrrophyta were found to be the dominant phytoplankton. The maximum density of phylum Chrysophyta (Diatoms) was observed mainly during the autumn in the coast line (below 20 m) and in the central part of the southern Caspian Sea, while the highest density of phylum Pyrrophyta occurred during the spring in the subcoastal zone (below 50 m.). The dominant species in the phylum Chrysophyta (Diatoms) were Rhizosolenia calcar-avis, Thalossionema nitzschiodes, Sceletonema costatum, Cyclotella meneghiniane and three members of genus Coscinodiscus, among which R. calcar-avis had the highest density. Members of phylum Pyrrophyta, i.e. Exuvialla cordata, Prorocentrum scutellum and Glenodinium penardii had the highest density during the spring in the central part of the southern Caspian Sea, where E. cordata was the most abundant.
    Keywords: Biology ; Ecology ; Density ; Distribution ; Dominant ; Phytoplankton ; Chrysophyta ; Diatoms ; Pyrrophyta ; Rhizosolenia calcar - avis ; Thalossionema nitzschiodes ; Sceletonema costatum ; Cyclotella meneghiniane ; Genus ; Exuvialla cordata ; Prorocentrum scutellum ; Glenodinium penardii ; E . cordata ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 95-108
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  • 2
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    The effects of different dietary levels of betaine and methionine as attractant on the growth factors and survival rate of juvenile beluga (Huso huso) (2021)
    In:  http://aquaticcommons.org/id/eprint/24281 | 18721 | 2018-08-04 07:05:56 | 24281 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: In an 8-week feeding trial, attractants betaine, methionine and a mixture of betaine and methionine were added to diet of juvenile beluga (1-huso huso) at different levels to assess their effects on growth and survival rate of the fish. In the trial, carried out in Shahid Marjani center for sturgeon hatchery and cultivation in Golestan Province of Iran, three different dietary levels 0.5%, 1% and 1.5% of attractants were used in PVC tanks filled with about 350 liters of water. We stocked 20 juvenile belugas with an average weight 28.2 ±2.63 grams in the tanks and fed them with four daily meals. Growth and survival factors were analyzed at the end of the trial period which showed that the addition of attractants in diets led to improvement of body weight gain, weight gain percentage* specific growth rate (SGR), protein efficiency ratio (PER), net protein utilization (NPU), condition factor(CF), survival, price index(PI) compared to control. The addition also led to a decrease in food conversion ratio (FCR) compared to control. The best improvement in indices was achieved with a diet enriched with 0.5% betaine and 1% methionine.
    Keywords: Aquaculture ; Growth ; Feeding ; Huso huso ; Methionine ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 41-50
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  • 3
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    Correlation between changes of Chlorophyll-a and transparency in the Southern Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/24832 | 18721 | 2018-07-17 01:32:30 | 24832 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Chlorophyll-a is a main pigment for photosynthetic process in marine phytoplankton and by it either amount of biomass can be estimated or can be considered as an index for trophic level of aquatic ecosystem. In year 1996, 81 secchi disc depth were measured and 1601 samples of chlorophyll-a were collected seasonaly from the southern Caspian Sea. The results showed that average chlorophyll-a in seasonals of spring, summer, autumn and winter were 1.072, 0.550, 1.848, 0.966 mg/m3 and depth of transparency were 6.42, 8.86, 5.62 and 5.22m, respectively. The statistical analysis showed a significant correlation (P〈0.01) between these two parameters in the southern Caspian Sea. More studies are needed to find out higher precise correlation.
    Keywords: Ecology ; Oceanography ; Chlorophyll-a ; Transparency ; Secchi Depth ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 191-200
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