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  • 1
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    Effects of water temperature on filtration rate of micro-algae Isochrysis affines galbana by black lip pearl oyster spat (Pinctada margaritifera) (2018)
    Details
    Publication Date: 2021-05-19
    Description: This study was conducted to compare the effects of varying water temperatures on filtration rate of micro-algae Isochrysis affines galbana by Pinctada margaritfera spat on microalgae. To determine the optimum temperature and maximum filtration rate, 10 pearl oyster . margaritfera spats with mean total and total hinge length 32.67 plus or minus 2.76 and 31.57 plus or minus 2.90 respectively were stocked in 70 liter rectangular glass tanks supplied with filtered seawater. The spats were exposed to seven treatments of temperature including 18.5 plus or minus 0.21C, 20.5 plus or minus 0.21C, 23 plus or minus 0.1C, 24.5 plus or minus 0.31C, 26.5 plus or minus 0.21C, 27.5 plus or minus 0.15C and 28.5 plus or minus 0.21C with 3 replicates. The results of filtration on I. affines galbana showed that the maximum filtration of spats on microalgae cells and water volume were 181,324,595 cells and 3626ml per hour and 635,031,212 cells and 12700ml per two hours in 27.5 plus or minus 0.15C, respectively. The minimum filtration of microalgae cells and water volume were 5,224,028 and 104ml per hour and 65,874,413 cells and 1317ml per two hours in 18.50 plus or minus 021C, respectively. The results of this study demonstrated that the optimum temperature for maximum feeding of spats on I. affines galbana is 27.5 plus or minus 0.15C.
    Description: Published
    Keywords: Phytoplankton culture ; Filtration ; Spat ; Pinctada margaritfera ; Isochrysis affines galbana ; Temperature effects ; Feeding ; Marine aquaculture ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.133-142
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  • 2
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    Monitoring of commercial marine stocks around Hormuzgan (bandar-e-Lengeh) artificial reefs (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Over-fishing of marine resources has endangered many commercial fish species in the world; with aquaculture development, setting up artificial reef systems is an important way for marine stocks and fishing enhancement. The present study was designed to monitor fish abundance and species changes around a small and newly established artificial reef system in Moloo area at Bandar-e-Lengeh during two years after installation (Sep. 2005 to Sep. 2007). The artificial reef includes three types of concrete structures arranged in a seven by three grid. Each cross point considered as a sampling station and two other stations selected from two sides of the system as control stations. Based on obtained results CPUE (P = 0.00001), frequency (P = 0.001) and species diversity of captured fishes (P = 0.024) showed significant differences between three types of sampling traps. With type of structures, The CPUE and frequency of fishes in transect 7(mixed structures) showed the significant differences with other six transects (p= 0.001, P = 0.009). No diversity relationships were seen between transects (p= 0.100). In this study there were no significant differences between depths. Although the means of CPUE between seasons were different, but the ANOVA test could not show the significant differences because of the differention between variances. The T-Test showed no significant differences between the number per trap per day dominant species (Epinephelus coioides, Plectorhinchus shotaf, Diagrama pictum, Siganus javus ) in different seasons. Movie prepared from artificial reefs showed diversity of fish were more than that of fishing by trap. Although fishes increased but there was no enough causes evidences for product in artificial reefs. Therefore, the study need to continue in this area.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Commercial ; Artificial reef ; Monitoring of stocks ; Density ; Diversity ; CPUE ; Marine ; Species ; Aquaculture ; CPUE ; ANOVA ; Epinephelus coioides ; Plectorhinchus shotaf ; Diagrama pictum ; Siganus javus
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 80pp.
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  • 3
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    Population dynamics of pearl oyster Pinctada radiata west of Lavan Island of the Persian Gulf, Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/23656 | 18721 | 2018-07-15 00:23:26 | 23656 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-14
    Description: Investigation on pearl oyster, Pinctada radiata growth and mortality parameters was carried out from September 2001 to October 2002 in west of Lavan Island using scuba diving method. Hinge length (HL) and dorsoventral measurement (DVM) relationship was significantly (r ^ (2) =0.98) linear. Weight and dorsoventral measurement relationship was shown to be W=0.0004 L ^ (2.812) (r ^ (2) =0.98). Asymptotic length (L infinity) and growth rate (K) were estimated at 98 (mm) and 0.96 y ^ (-1) respectively. More than 70 percent of the individuals were matured in April 2001. Mortality parameters including natural mortality (M), total mortality (Z) and fishery mortality (F) were estimated to be 1.21y ^ (-1), 1.68y ^ (-1) and 0.66y ^ (-1) respectively. Exploitation rate was estimated to be 0.27 in this survey.
    Keywords: Biology ; Length-weight relationships ; Growth rate ; Mortality ; Growth ; Exploitation ; Population dynamics ; Marine ; Pearl oysters ; Pinctada radiata ; Lavan Island ; ISW ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-10
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  • 4
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    Monitoring of commercial marine stocks around Hormuzgan (bandar-e-Lengeh) artificial reefs (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25203 | 18721 | 2018-09-05 16:18:18 | 25203 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Over-fishing of marine resources has endangered many commercial fish species in the world; with aquaculture development, setting up artificial reef systems is an important way for marine stocks and fishing enhancement. The present study was designed to monitor fish abundance and species changes around a small and newly established artificial reef system in Moloo area at Bandar-e-Lengeh during two years after installation (Sep. 2005 to Sep. 2007). The artificial reef includes three types of concrete structures arranged in a seven by three grid. Each cross point considered as a sampling station and two other stations selected from two sides of the system as control stations. Based on obtained results CPUE (P = 0.00001), frequency (P = 0.001) and species diversity of captured fishes (P = 0.024) showed significant differences between three types of sampling traps. With type of structures, The CPUE and frequency of fishes in transect 7(mixed structures) showed the significant differences with other six transects (p= 0.001, P = 0.009). No diversity relationships were seen between transects (p= 0.100). In this study there were no significant differences between depths. Although the means of CPUE between seasons were different, but the ANOVA test could not show the significant differences because of the differention between variances. The T-Test showed no significant differences between the numbers per trap per day dominant species (Epinephelus coioides, Plectorhinchus shotaf, Diagrama pictum, Siganus javus) in different seasons. Movie prepared from artificial reefs showed diversity of fish were more than that of fishing by trap. Although fishes increased but there was no enough causes evidences for product in artificial reefs. Therefore, the study need to continue in this area.
    Keywords: Ecology ; Iran ; Hormuzgan Province ; Bandar Lengeh ; Artificial reef ; Monitoring of stocks ; Density ; Diversity ; CPUE ; Marine ; Species ; Aquaculture ; ANOVA ; Epinephelus coioides ; Plectorhinchus shotaf ; Diagrama pictum ; Siganus javus
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 80
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  • 5
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    Population dynamics of pearl oyster Pinctada radiate west of Lavan Island of the Persian Gulf, Iran (2018)
    Details
    Publication Date: 2021-05-19
    Description: Investigation on pearl oyster, Pinctada radiate growth and mortality parameters was carried out from September 2001 to October 2002 in west of Lavan Island using scuba diving method. Hinge length (HL) and Dorso-ventral measurement (DVM) relationship was significantly (r super(2)=0.98) linear. Weight and dorso-ventral measurement relationship was shown to be W=0.0004 L super(2.812)(r super(2)=0.98). Asymptotic length (L infinity ) and growth rate (K) were estimated at 98 (mm) and 0.96 y super(-1) respectively. More than 70 percent of the individuals were matured in April 2001. Mortality parameters including natural mortality (M), total mortality (Z) and fishery mortality (F) were estimated to be 1.21y super(-1), 1.68y super(-1) and 0.66y super(-1) respectively. Exploita-tion rate was estimated to be 0.27 in this survey.
    Description: Published
    Keywords: Pearl oysters ; Pinctada radiata ; Length-weight relationships ; Growth rate ; Mortality ; Growth ; Exploitation ; Population dynamics ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-10
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