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  • 1
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    The role of daphnia fed with purified and enriched phytoplankton with PUFA in enhancing growth and survival of Acipenser persicus larvae (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: In this study, Daphnia longispina were fed with two freshwater green algae species, Chlorella vulgaris and Scenedesmus dimorphus, enriched with Docosahexaenoic acid (DHA). Chlorella vulgaris and Scenedesmus dimorphus were isolated and cultured for mass production. Three treatments with three replicates and a control group were considered to conduct this study. In order to investigate feeding, a total of 30 Acipenser persicus larvae with the initial mean weight of 68±3.6 mg were distributed into 12 plastic tanks of 60 L. Experimental fish larvae were fed daphnia collected from earthen ponds (as control group), daphnia enriched with Scenedesmus dimorphus (treatment 1), daphnia enriched with Chlorella vulgaris (treatment 2) and daphnia enriched with Chlorella vulgaris and Scenedesmus dimorphus (at the rates of 50%) (treatment 3). The microalgae density to enrich daphnia is estimated at 5×107 cells mL-1 . Fish larvae were fed at an amount of 30% body weight per day for four times. During the experimental period, water temperature, dissolved oxygen concentration and pH ranged between 18-24°C, 5.8-7.2 mg l-1 and 5.6-8.2, respectively. Monounsaturated fatty acids (MUFA) were the highest (32.3 %) in D. longispina enriched with Chlorella vulgaris and the highest concentration of polyunsaturated fatty acids (PUFA) (19.8%) was observed in D. longispina enriched with Scenedesmus dimorphus. The highest (21.6%) and lowest (13.2%) concentrations of PUFA in fish larvae were recorded in treatment 3 and the control group, respectively. The results obtained from the body weight increase (BWI %) revealed that there were significant differences (P≤0.05) between treatment 3 (daphnia enriched with chlorella and scenedesmus) and other treatments. The highest (5.5 ± 1.24 % day-1) and the lowest (4.6± 1.13% day-1) mean specific growth rates (SGR) were recorded in fish fed treatment 3 and the control group, respectively. The lowest (68%) and the highest (85%) survival rates were obtained in the control group and treatment 3, respectively.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Daphnia ; Daphnia longispina ; Chlorella vulgaris ; Scenedesmus dimorphus ; Enrichment ; Microalgae ; Acipenser persicus ; survival ; Larvae ; Phytoplankton ; PUFA ; Growth
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 41pp.
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  • 2
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    Effects of enriched daphnia with microscopic algae on some growth indices and survival rate of Persian sturgeon (Acipenser persicus) larvae (2017)
    Details
    Publication Date: 2021-05-19
    Description: Microalgae as a source of valuable compounds such as fatty acids are isolated from the natural environments and their mass production with high nutritional value is one the necessities of many hatcheries. The present study aimed to determine the effects of enriched daphnia with microscopic algae on some growth indices and survival rate of Persian sturgeon (Acipenser persicus) larvae. Chlorella vulgaris and Scenedesmus dimorphus were purified and cultured. Then, Daphnia longispina was fed microalgae including Chlorella vulgaris and Scenedesmus dimorphus enriched with Docosahexaenoic acid (DHA). The microalgae density to enrich daphnia was estimated at 5× 107 cells mL-1. Three treatments with three replicates and a control group were considered in this study. A total of 30 Acipenser persicus larvae were allocated to each sixty liters tank. Experimental fish were fed daphnia enriched with Chlorella vulgaris (treatment 1), daphnia enriched with Scenedesmus dimorphus (treatment 2) and daphnia enriched with Chlorella vulgaris and Scenedesmus dimorphus (at the rates of 50%) (treatment 3). Persian sturgeon larvae in the control group were fed like VNIRO stage from daphnia caught in pond. Larvae were fed 30% of body weight per day for four times. During the experimental period, water temperature, dissolved oxygen concentration and pH ranged between 18-24°C, 5.8-7.2 mg l-1 and 5.6-8.2, respectively. The minimum (219 ± 98.4 mg) and maximum (315.16 ± 140.8 mg) mean (±SD) weights were observed in the control group and treatment 3, respectively. The results obtained from the body weight increase (BWI %) revealed that there were significant differences between treatment 3 and other treatments. Highest (4.6±1.13% day-1) and lowest (5.5±1.24% day-1) mean (±SD) specific growth rates (SGR) were recorded in fish fed the control group and treatment 3, respectively. Lowest (68%) and highest (85%) survival rates were recorded in the control group and treatment 3, respectively.
    Description: Published
    Keywords: Acipenseridae ; Acipenser persicus ; Persian sturgeon ; Aquaculture ; Nutrition ; Algae ; Growth ; Survival ; Larvae
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.47-54
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  • 3
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    Effect of light intensity and photoperiod on growth rate and biomass of Chlorella vulgaris (2018)
    Details
    Publication Date: 2021-05-19
    Description: This study provides information on the effect of three light intensities (37.5, 62.5 and lOO!lmol photons.m- 2 s-1) and photoperiods (light:dark) cycle 8:16, 12:12 and 16:8h on growth rate, duplication time and biomass production in microalga Chiarella vulgaris. Stock of C. vulgaris was separated from water samples taken at Anzali Wetland, purified and cultured in lOOOml Erlenmeyer at constant temperature 25±0.5°C, using Zehnder medium. Cell count was conducted daily and biomass was measured at the exponential growth phase in different treatments. Analysis of variance indicated significant difference (P〈0.05) among light regimes. The maximum growth rate 1.13d-1 was observed at 10011mol photons.m- 2 s-1 and 16:8h light duration and also the minimum duplication time 0.61d- 1 occurred at this treatment. The maximum biomass 2.05gr 1 was recorded at 62.5!lmol photons.m -2 s-1 and 8:16h light period.
    Description: Published
    Keywords: Chlorella vulgaris ; Photoperiod ; Early stock ; Growth rate ; Biomass
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.11-20
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  • 4
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    Effect of light intensity and photoperiod on growth rate and biomass of Chlorella vulgaris (2021)
    In:  http://aquaticcommons.org/id/eprint/23866 | 18721 | 2018-08-01 05:18:15 | 23866 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: This study provides information on the effect of three light intensities (37.5, 62.5 and 100L/mol photons.m^- 2 s^-1) and photoperiods (light:dark) cycle 8:16, 12:12 and 16:8h on growth rate, duplication time and biomass production in microalga Chiarella vulgaris. Stock of C. vulgaris was separated from water samples taken at Anzali Wetland, purified and cultured in l000ml Erlenmeyer at constant temperature 25±0.5°C, using Zehnder medium. Cell count was conducted daily and biomass was measured at the exponential growth phase in different treatments. Analysis of variance indicated significant difference (P〈0.05) among light regimes. The maximum growth rate 1.13d^-1 was observed at 100L/mol photons.m^- 2 s^-1 and 16:8h light duration and also the minimum duplication time 0.61d^- 1 occurred at this treatment. The maximum biomass 2.05gr^-1 was recorded at 62.5L/mol photons.m^ -2 s^-1 and 8:16h light period.
    Keywords: Aquaculture ; Chlorella vulgaris ; Photoperiod ; Growth rate ; Early stock ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 11-20
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  • 5
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    The role of daphnia fed with purified and enriched phytoplankton with PUFA in enhancing growth and survival of Acipenser persicus larvae (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25464 | 18721 | 2018-09-26 09:35:11 | 25464 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: In this study, Daphnia longispina were fed with two freshwater green algae species, Chlorella vulgaris and Scenedesmus dimorphus, enriched with Docosahexaenoic acid (DHA). Chlorella vulgaris and Scenedesmus dimorphus were isolated and cultured for mass production. Three treatments with three replicates and a control group were considered to conduct this study. In order to investigate feeding, a total of 30 Acipenser persicus larvae with the initial mean weight of 68±3.6 mg were distributed into 12 plastic tanks of 60 L. Experimental fish larvae were fed daphnia collected from earthen ponds (as control group), daphnia enriched with Scenedesmus dimorphus (treatment 1), daphnia enriched with Chlorella vulgaris (treatment 2) and daphnia enriched with Chlorella vulgaris and Scenedesmus dimorphus (at the rates of 50%) (treatment 3). The microalgae density to enrich daphnia is estimated at 5×107 cells mL^-1. Fish larvae were fed at an amount of 30% body weight per day for four times. During the experimental period, water temperature, dissolved oxygen concentration and pH ranged between 18-24°C, 5.8-7.2 mg l^-1 and 5.6-8.2, respectively. Monounsaturated fatty acids (MUFA) were the highest (32.3 %) in D. longispina enriched with Chlorella vulgaris and the highest concentration of polyunsaturated fatty acids (PUFA) (19.8%) was observed in D. longispina enriched with Scenedesmus dimorphus. The highest (21.6%) and lowest (13.2%) concentrations of PUFA in fish larvae were recorded in treatment 3 and the control group, respectively. The results obtained from the body weight increase (BWI %) revealed that there were significant differences (P≤0.05) between treatment 3 (daphnia enriched with chlorella and scenedesmus) and other treatments. The highest (5.5±1.24% day^-1) and the lowest (4.6±1.13% day^-1) mean specific growth rates (SGR) were recorded in fish fed treatment 3 and the control group, respectively. The lowest (68%) and the highest (85%) survival rates were obtained in the control group and treatment 3, respectively.
    Keywords: Aquaculture ; Iran ; Daphnia ; Daphnia longispina ; Chlorella vulgaris ; Scenedesmus dimorphus ; Enrichment ; Microalgae ; Acipenser persicus ; survival ; Larvae ; Phytoplankton ; PUFA ; Growth
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 41
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  • 6
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    Phytoplankton as bio-indicator of water quality in Sefid Rud River, Iran (South of Caspian Sea) (2021)
    In:  http://aquaticcommons.org/id/eprint/21730 | 18721 | 2017-11-28 08:51:50 | 21730 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-29
    Description: Phytoplankton are the first bio- indicators of pollution in aquatic ecosystems. Phytoplankton assemblage and aquatic ecosystems are always influenced by environmental factors therefore these environmental changes and threats must be understood in any ecosystem. Phytoplanktons are inexpensive and readily available bio- indicators. In the present study, phytoplankton were used to study the Sefid Rud River (the south Caspian Sea), in Iran. Three sampling sites were selected up to 25- 30 km from the River estuary. Samplings were carried out from June through September 2009. Phytoplankton samples were collected by phytoplankton sampler net with mesh size of 25µm. Water parameters including transparency, temperature, water velocity and pH were measured during the survey. Mean water temperature was 26.9 ± 7.7 ºc, velocity 0.13 ± 0.01 m/s, Secchi disk transparency and pH were 45cm and 7.4, respectively. Phytoplankton assemblage comprised Bacillariophyceae (61.2٪), Chlorophyceae (31.6%), Euglenophyceae (5.0%) and Cyanophyceae (2.23٪). Significant differences were observed in diversity and abundance of four main groups of phytoplankton between sampling stages. Significant positive correlations were detected between transparency and abundance of Chlorophyta, while negative correlations were found between transparency and Euglenophyceae abundances. The highest abundance of Euglena and Phacus (Euglenophyceae) occurred at high turbidity while maximum abundance of Pediastrum and Scenedesmus (Chlorophyceae) correlated with high water transparencies. Genus Oscillatoria (Cyanophyceae) was observed (abundance 18%) only in station 2 and influenced by agricultural activities. The study showed those phytoplankton are suitable bio- indicators of environmental changes which may threaten the Sefid Rud River and the Caspian Sea.
    Keywords: Biology ; Ecology ; Environment ; Pollution ; phytoplankton ; water quality ; Sefid Rud River ; Iran ; Caspian Sea
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 31-40
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  • 7
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    First record of Ebria tripartita (Schumann) Lemmermann, 1899 from south of the Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/21762 | 18721 | 2017-11-30 05:06:46 | 21762 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-07-01
    Description: Ebria tripartita (Schumann) Lemmermann, 1899, a non-photosynthetic flagellate algae was identified from the southern coast of the Caspian Sea in December 2012. Water temperature at the sampling time was 10 ºC The average concentration of nitrate, phosphate and silicate were 0.7, 0.1 and 1.8 mg.l -1 respectively at the time when species was observed. Total observed phytoplankton cells was 3 × 106 cells.l -1, of which E. tripartita constitute 2×10 3 cells.l -1 representing only 0.75% of phytoplankton community.
    Keywords: Biology ; Ebria tripartita ; First ; record ; Caspian sea ; Iran ; algae ; phytoplankton
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 283-288
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  • 8
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    Effects of enriched daphnia with microscopic algae on some growth indices and survival rate of Persian sturgeon (Acipenser persicus) larvae (2021)
    In:  http://aquaticcommons.org/id/eprint/21950 | 18721 | 2018-01-18 09:35:01 | 21950 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-05
    Description: Microalgae as a source of valuable compounds such as fatty acids are isolated from the natural environments and their mass production with high nutritional value is one the necessities of many hatcheries. The present study aimed to determine the effects of enriched daphnia with microscopic algae on some growth indices and survival rate of Persian sturgeon (Acipenser persicus) larvae. Chlorella vulgaris and Scenedesmus dimorphus were purified and cultured. Then, Daphnia longispina was fed microalgae including Chlorella vulgaris and Scenedesmus dimorphus enriched with Docosahexaenoic acid (DHA). The microalgae density to enrich daphnia was estimated at 5× 107 cells mL-1. Three treatments with three replicates and a control group were considered in this study. A total of 30 Acipenser persicus larvae were allocated to each sixty liters tank. Experimental fish were fed daphnia enriched with Chlorella vulgaris (treatment 1), daphnia enriched with Scenedesmus dimorphus (treatment 2) and daphnia enriched with Chlorella vulgaris and Scenedesmus dimorphus (at the rates of 50%) (treatment 3). Persian sturgeon larvae in the control group were fed like VNIRO stage from daphnia caught in pond. Larvae were fed 30% of body weight per day for four times. During the experimental period, water temperature, dissolved oxygen concentration and pH ranged between 18-24°C, 5.8-7.2 mg l-1 and 5.6-8.2, respectively. The minimum (219 ± 98.4 mg) and maximum (315.16 ± 140.8 mg) mean (±SD) weights were observed in the control group and treatment 3, respectively. The results obtained from the body weight increase (BWI %) revealed that there were significant differences between treatment 3 and other treatments. Highest (4.6±1.13% day-1) and lowest (5.5±1.24% day-1) mean (±SD) specific growth rates (SGR) were recorded in fish fed the control group and treatment 3, respectively. Lowest (68%) and highest (85%) survival rates were recorded in the control group and treatment 3, respectively.
    Keywords: Aquaculture ; Aquaculture ; Nutrition ; Acipenseridae ; Iran ; growth ; algae ; Persian sturgeon ; Acipenser persicus ; larvae ; Chlorella vulgaris ; Scenedesmus dimorphus ; Daphnia longispina ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 47-54
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  • 9
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    Evaluation of antimicrobial activities of microalgae Scenedesmus dimorphus extracts against bacterial strains (2018)
    Details
    Publication Date: 2021-05-19
    Description: The study was conducted to analyze the existence of bioactive phytochemicals extracts in green alga Scenedesmus dimorphus and their antimicrobial role. Various solvents such as methanol, ethanol, N-hegzane and diethylether were used for extraction. The extracts of of Scenedesmus dimorphus were tested against two Gram - positive bacteria (Bacillus subtilis and Micrococcus luteus), a Gram - negative bacterium (A. hydrophila) and Escherichia coli by the agar well diffusion method. Four different methanolic, ethanolic, hexane and diethylether extracts showed effective inhibition against different bacterial pathogens. Diethylether extract was very effective against bacterial strains compared to other extracts. Methanolic extract effectively inhibited A. hydrophila in comparison with other extracts, while ethanolic extract did not have any inhibitory effect on the bacterium. Methanolic, ethanolic, hexane and diethylether extracts were analyzed by GC mass. The most abundant compounds in methanolic extract of S. dimorphus included esters, plasticizer compound and terpens, while in the ethanolic, N-hexane and diethylether extracts, the most abundant compounds were found to be plasticizers, hydrocarbon and esters. These results indicate the presence of promising antimicrobial compounds in the examined algal species. Further phytochemical studies are required to elucidate the structutre and detailed activities of these compounds. So, we achieved antimicrobial activity in the methanolic, ethanolic, hexane and ether extracts of green microalgae against some pathogenic bacteria as well as employing GC mass autogram for S. dimorphus extracts for preliminary detection of active constituents.
    Description: Published
    Keywords: Scenedesmus dimorphus ; Antibacterial ; Antimicrobial ; Aeromonas hydrophila ; Bacillus subtilis ; Evaluation ; Microalgae
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.25-36
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  • 10
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    Phytoplankton as bio-indicator of water quality in Sefid Rud River, Iran (South of Caspian Sea) (2017)
    Details
    Publication Date: 2021-05-19
    Description: Phytoplanktons are the first bio- indicators of pollution in aquatic ecosystems. Phytoplankton assemblage and aquatic ecosystems are always influenced by environmental factors therefore these environmental changes and threats must be understood in any ecosystem. Phytoplankton are inexpensive and readily available bio- indicators. In the present study, phytoplankton were used to study the Sefid Rud River (the south Caspian Sea), in Iran. Three sampling sites were selected up to 25- 30 km from the River estuary. Samplings were carried out from June through September 2009. Phytoplankton samples were collected by phytoplankton sampler net with mesh size of 25µm. Water parameters including transparency, temperature, water velocity and pH were measured during the survey. Mean water temperature was 26.9 ± 7.7 ºc, velocity 0.13 ± 0.01 m/s, Secchi disk transparency and pH were 45cm and 7.4, respectively. Phytoplankton assemblage comprised Bacillariophyceae (61.2٪), Chlorophyceae (31.6٪), Euglenophyceae (5.0٪) and Cyanophyceae (2.23٪). Significant differences were observed in diversity and abundance of four main groups of phytoplankton between sampling stages. Significant positive correlations were detected between transparency and abundance of Chlorophyta, while negative correlations were found between transparency and Euglenophyceae abundances. The highest abundance of Euglena and Phacus (Euglenophyceae) occurred at high turbidity while maximum abundance of Pediastrum and Scenedesmus (Chlorophyceae) correlated with high water transparencies. Genus Oscillatoria (Cyanophyceae) was observed (abundance 18٪) only in station 2 and influenced by agricultural activities. The study showed that phytoplankton are suitable bio- indicators of environmental changes which may threaten the Sefid Rud River and the Caspian Sea.
    Description: Published
    Keywords: Bio-indicator ; Phytoplankton ; Water ; Water quality ; Pollution
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.31-40
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