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  • 1
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    The effectiveness of artificial reefs for rehabilitation and production of fisheries in Iran (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: An artificial Reef is a fabricated, underwater structure, typically built for promoting marine life in areas of generally featureless bottom. Creating artificial reefs began from 2000 in southern provinces in Iran. This study has surveyed about the Bushehr and Khozestan states. The objective is to determine the effectiveness of artificial reefs in attracting and enhancing the production different aquatics through increasing of fish assemblage and fishery. The performance of artificial reefs deployed off the coast of the Persian Gulf in 10 to 15m, was evaluated. The reefs comprised of seven artificial and one control (natural) statistical tests plan in three replicates. Three types of artificial reefs were used in this study. That two were designed reefs and one was not designed or used material. The experimental plan consisted (i) Reef ball (R), designed hemispherical shaped; (ii) Laneh Mahi (L), designed pyramid shaped; (iii) Used material (U); (iv) mixed (RL); (v) mixed (RU); (vi) mixed (LU); (vii) mixed (RLU); and (viii) control site (CS). Trap nets and under-water visual census surveys were adopted for seasonal sampling of fish aggregation. Results of statistical analysis using ANOVA and T-test of the mean Catch per Unit Effort (CPUE) showed significant difference (p〈0.05) in term of computing number of fish for aggregation of fishes. The study has concluded that reef deployments have influenced favorably the fish communities and fish harvests. Therefore, the artificial reefs, especially the mixed RLU, are appropriate tools for future fishing enhancement in the Persian Gulf of Iran.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Artificial reefs ; Fisheries ; Marine ; Survey ; Hemispherical ; ANOVA ; CPUE ; Underwater structure
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 188pp.
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  • 2
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    Stock assessment of freshwater crayfish (Astacus leptodactylus) in Aras reservoir (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: 360 funnel traps were prepared as 30 in one row. They were bitted and located in different depths in sampling sites. Two rows each composed of 30 traps were located by stone, linking rope and boat with 50 m distance in sampling stations. The results showed that the average of total length of caught crayfish was 106.26±12.89 mm and their mean weight was 38.79 ± 15.54 gr. The largest crayfish had 171 mm length and 216 g weight. Also mean of total CPUE was 9.72±4.49 individuals in the study period. The evaluation by Schnabel approach indicated that fluctuation range of freshwater crayfish biomass with more than 120mm length was 131-313 with an average of 212.59 ±30.23 kilograms per ha. In this study freshwater crayfish biomass with more than 120mm length was 247 × 10^3 kilograms. The Maximum Sustainable Yield (MSY) was estimated 83 × 10^3 kilograms. In this study ّFecundity and biometry of crayfish (Astacus leptodactylus) was investigated during 2012-2013. The results showed that the average of total length of caught crayfish was 106.26±12.89 mm and their mean weight was 38.79 ± 15.54 gr. The largest crayfish had 171 mm length and 216 g weight. Mean number of ovarian and pleopodal eggs were estimated at 286 ± 82 and 246.31 ± 80.41 eggs (with 95% confidence limits), respectively. In this research, male to female ratio was obtained 1.21:1. The time of male moulting at 16° C was started from April and was ended in the late May, when the water temperature reached to 18° C. The second moulting of males and the first moulting of females was performed simultaneously in 18° C water temperature at September. Reproduction of freshwater crayfish was started from November and continued to May of the next year. Harvesting period was from May to late November.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Freshwater ; Crayfish ; Astacus leptodactylus ; Fecundity ; Biometry ; Population changes
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 104pp.
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  • 3
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    A study on the bacterial infections of freshwater crayfish (Astacus leptodactylus) in the Aras reservoir (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Astacus leptodactylus is an important economical fisheries resource of Aras dam reservoir, in Iran. The infection of freshwater crayfish by gram negative and gram positive bacteria is often observed in natural and cultural environments which are considered as secondary disease agents or opportunities. This study was conducted to investigate infection conditions on 70 crayfish from the Aras reservoir regarding the bacterial agents by culturing from hemolymph in aseptic condition on Blood Agar, Trypton Soya Agar (TSA) and Cytophaga Agar The study was performed by biochemical tests. In this study Aeromonas hydrophila, Staphylococcus aureus, Micrococcus luteus and Flavobacterium johnsonaewere isolated and determined. According to the results of this study which was performed for first time on Aras reservoir freshwater crayfish, the percentage of crayfish which carried bacteria in hemolymph were variable ( 20-58.5%). Also, the gram negative bacteria particularly Aeromonas hydrophyla were dominant among the bacteria isolated from studied crayfishes.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Freshwater ; Crayfish ; Bacterial infection ; Aeromonas hydrophila ; Staphylococcus aureus ; Micrococcus luteus ; Flavobacterium johnsonae
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 32pp.
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  • 4
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    The effectiveness of artificial reefs for rehabilitation and production of fisheries in Iran (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25250 | 18721 | 2018-09-06 06:29:01 | 25250 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: An artificial Reef is a fabricated, underwater structure, typically built for promoting marine life in areas of generally featureless bottom. Creating artificial reefs began from 2000 in southern provinces in Iran. This study has surveyed about the Bushehr and Khozestan states. The objective is to determine the effectiveness of artificial reefs in attracting and enhancing the production different aquatics through increasing of fish assemblage and fishery. The performance of artificial reefs deployed off the coast of the Persian Gulf in 10 to 15m, was evaluated. The reefs comprised of seven artificial and one control (natural) statistical tests plan in three replicates. Three types of artificial reefs were used in this study. That two were designed reefs and one was not designed or used material. The experimental plan consisted (i) Reef ball (R), designed hemispherical shaped; (ii) Laneh Mahi (L), designed pyramid shaped; (iii) Used material (U); (iv) mixed (RL); (v) mixed (RU); (vi) mixed (LU); (vii) mixed (RLU); and (viii) control site (CS). Trap nets and under-water visual census surveys were adopted for seasonal sampling of fish aggregation. Results of statistical analysis using ANOVA and T-test of the mean Catch per Unit Effort (CPUE) showed significant difference (p〈0.05) in term of computing number of fish for aggregation of fishes. The study has concluded that reef deployments have influenced favorably the fish communities and fish harvests. Therefore, the artificial reefs, especially the mixed RLU, are appropriate tools for future fishing enhancement in the Persian Gulf of Iran.
    Keywords: Aquaculture ; Iran ; Persian Gulf ; Khozestan Province ; Bushehr Province ; Artificial reefs ; Fisheries ; Marine ; Survey ; Hemispherical ; ANOVA ; CPUE ; Underwater structure
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 188
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  • 5
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    The effect of different methods on fatty acid composition of Tilapia, Oreochromis niloticus, fillets (2021)
    In:  http://aquaticcommons.org/id/eprint/21838 | 18721 | 2018-01-16 11:16:52 | 21838 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-03
    Description: Tilapia, a perch fish from Cichlidae family has witnessed a vast and fast growth in artificial culture due to simple and inexpensive procedures for the practice. One of the most important farm species is considered to be the Nile Tilapia (Oreochromis niloticus). The effects of different cooking methods on fatty acid composition and nutritional value of Tilapia fish fillet were evaluated. The cooking methods included: Red off, microwave, oven cooking, barbecue, boiled water and raw treatment. The protein content was assessed using the Kjeldahl method, moisture was evaluated through dry method, fat and ash through Soxhlet and electric furnace methods. To measure the composition of fatty acids, Gas-chromatography method (GC) was applied, and the Bligh and Dyer method of extraction and identification of fatty acids was implemented. The results showed that applying different curing methods caused moisture loss of 1-9%, 2-12% increase in protein content, fat reduction of 0.2-4.2% (excluding the red off treatment in which fat increased by about 0.5%), increase in ash of 0.7-0.15%, reduction of Mono Unsaturated Fatty Acids between 1-6% and increase in Poly Unsaturated Fatty Acids between 0.5-14%. The rate of saturated fatty acids showed an increase of 0.6-1.6% in all treatments with the exception of baking and red off treatments. The results indicated the lowest change (about 0.2%) in EPA, in the microwave and grilled fillet treatments and the highest change (0.7%) in the red off fillets compared to raw samples. The minimum change in DHA was observed in the oven-cooked fillets (0.45%) and the maximum change (2.5%) in the red off fillets. The highest EPA and DHA were found as 1.33 and 3.32% in samples cooked in oven. Results showed that the ratio of 6/ 3 increased in the red off samples compared to other treatments.
    Keywords: Biology ; Fisheries ; Tilapia ; Fatty acids ; Processing ; Nutritional value ; Oreochromis niloticus ; fillets ; methods ; iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 97-108
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  • 6
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    Nutrient values of the rock oyster Saccostrea cucullata in Oman Sea shore (2021)
    In:  http://aquaticcommons.org/id/eprint/24837 | 18721 | 2018-07-17 01:02:06 | 24837 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Nutrient values of the oyster Saccostrea cucullata were studied in 3 stations in the Iranian shores of the Oman Sea, Beris, Chabahar and Tang Specimens were taken monthly during summer 1999. Water, ash, protein, amino acids, T. V .N and fat contents were measured using standard methods. Highest water content was measured 78.34 percent tor Beris specimens. It was 77.95 and 78.10 percent for tang and Chabahar specimens, respectively. Chabahar oysters had highest ash content of 3.16 percent in comparison to 2.73 and 2.5 percent for Tang and Beris respectively. Highest protein content measured 16.26 percent for Chabahar specimens, while it was 15.45 and 15.42 percent for Beris and Tang specimens, respectively. Chabahar specimens had also highest measured T.V.N, 5.6 mg/g, compared to 2.8 mg/g for Beris and Tang specimens. Chabahar specimens were richest in fat content with 0.8 percent compared to 0.72 and 0.64 percent for tang and Beris specimens.
    Keywords: Biology ; Chemistry ; Fisheries ; Nutrient values ; Oyster ; Saccostrea cucullata ; Oman Sea ; Beris ; Chabahar ; Tang ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 23-32
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  • 7
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    Stock assessment of freshwater crayfish (Astacus leptodactylus) in Aras reservoir (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25567 | 18721 | 2018-10-05 17:27:57 | 25567 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: 360 funnel traps were prepared as 30 in one row. They were bitted and located in different depths in sampling sites. Two rows each composed of 30 traps were located by stone, linking rope and boat with 50 m distance in sampling stations. The results showed that the average of total length of caught crayfish was 106.26±12.89 mm and their mean weight was 38.79 ± 15.54 gr. The largest crayfish had 171 mm length and 216 g weight. Also mean of total CPUE was 9.72±4.49 individuals in the study period. The evaluation by Schnabel approach indicated that fluctuation range of freshwater crayfish biomass with more than 120mm length was 131-313 with an average of 212.59 ±30.23 kilograms per ha. In this study freshwater crayfish biomass with more than 120mm length was 247 × 10^3 kilograms. The Maximum Sustainable Yield (MSY) was estimated 83 × 10^3 kilograms. In this study ّFecundity and biometry of crayfish (Astacus leptodactylus) was investigated during 2012-2013. The results showed that the average of total length of caught crayfish was 106.26±12.89 mm and their mean weight was 38.79 ± 15.54 gr. The largest crayfish had 171 mm length and 216 g weight. Mean number of ovarian and pleopodal eggs were estimated at 286 ± 82 and 246.31 ± 80.41 eggs (with 95% confidence limits), respectively. In this research, male to female ratio was obtained 1.21:1. The time of male moulting at 16°C was started from April and was ended in the late May, when the water temperature reached to 18° C. The second moulting of males and the first moulting of females was performed simultaneously in 18°C water temperature at September. Reproduction of freshwater crayfish was started from November and continued to May of the next year. Harvesting period was from May to late November.
    Keywords: Fisheries ; Iran ; West Azerbaijan ; Aras reservoir ; Freshwater ; Crayfish ; Astacus leptodactylus ; Fecundity ; Biometry ; Population changes
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 104
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  • 8
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    A study on the parasites (protozoan and metazoan) of freshwater crayfish (Astacus leptodactylus) in the Aras reservoir (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25684 | 18721 | 2018-10-08 09:11:18 | 25684 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Aras reservoir freshwater crayfish is an important economic fisheries resource of West Azarbaijan, Iran. This study was concluded to evaluate the prevalence of parasitic infestation of Crayfish in this area during different seasons of 2012. Among 390 different sizes of Astacus leptodactylus which were examined, arrange of ectocommensals or ectosymbionts from a number of different phyla including 9 phylum and 11 class infested the different anatomic units of the surface and appendages such as gills, head , thorax, abdomen, walking legs, uropod, telson, antennae and antennulae of freshwater crayfish. Common groups such as peritrich ciliates, suctorian ciliates, free living nematodes, branchiobdellids, and Algae, copepods, rotifers and oligochaetes have also been observed in association with freshwater crayfish.
    Keywords: Fisheries ; Health ; Iran ; Aras dam ; West Azarbaijan ; Crayfish ; Freshwater ; Parasitic andcommensal infestation ; Astacus leptodactylus
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 58
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  • 9
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    Protein and lipid changes of FPC produced from Caspian Sea kilkas in VP and MAP during storage at different temperatures (2021)
    In:  http://aquaticcommons.org/id/eprint/22516 | 18721 | 2018-04-16 21:36:31 | 22516 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-06
    Description: Fish Protein Concentrate (FPC) is a healthy, sustainable and high nutritive product that produced from fish and protein and other nutrients are more concentrated than in the fresh fish. The aim of this research is to study the sustainability of FPC produced from Kilka (combination of three Caspian Sea Kilka species, Clupeonella engrauliformis, C. grimmi and C. cultriventris which were not identified and processed separately) in VP (Vacuum Packaging) and MAP (Modified Atmosphere Packaging) at different temperatures during six months of storage. According to result of chemical analysis performed, protein content was evaluated 91.2%, lipid 0.5%, ash 3.6%, moisture 2.3%, TVN 10 mg/100g and peroxide 5 meq/kg in the produced FPC before packing. Amino acids and fatty acids were also determined. Lipid amount in FPC after 6 months at 35°C in VP changed from 0.50 to 0.45 and in MAP (combined of 60% CO2, 30% N2 and 10% O2), decreased from 0.50 to 0.36. It was also detected that increase in temperature leads to more decrease in lipid content but it was not significant (P〉0.05). Protein content of FPC has changed from 91.2% to 73.6% during six months at 35°C in VP and 69.4% in MAP. But at 5°C, protein contents were changed from 91.2% to 88.4% and 81.2% in VP and MAP, respectively; these changes were significant (P〈0.05) but the decrease in MAP was again more than VP.
    Keywords: Biology ; Chemistry ; Fisheries ; Fish Protein Concentrate ; Kilka ; Vacuum Packaging ; Modified Atmosphere Packaging ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 338-346
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  • 10
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    A study on the bacterial infections of freshwater crayfish (Astacus leptodactylus) in the Aras reservoir (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25600 | 18721 | 2018-10-07 16:21:40 | 25600 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Astacus leptodactylus is an important economical fisheries resource of Aras dam reservoir, in Iran. The infection of freshwater crayfish by gram negative and gram positive bacteria is often observed in natural and cultural environments which are considered as secondary disease agents or opportunities. This study was conducted to investigate infection conditions on 70 crayfish from the Aras reservoir regarding the bacterial agents by culturing from hemolymph in aseptic condition on Blood Agar, Trypton Soya Agar (TSA) and Cytophaga Agar The study was performed by biochemical tests. In this study Aeromonas hydrophila, Staphylococcus aureus, Micrococcus luteus and Flavobacterium johnsonaewere isolated and determined. According to the results of this study which was performed for first time on Aras reservoir freshwater crayfish, the percentage of crayfish which carried bacteria in hemolymph were variable ( 20-58.5%). Also, the gram negative bacteria particularly Aeromonas hydrophyla were dominant among the bacteria isolated from studied crayfishes.
    Keywords: Health ; Iran ; Aras dam reservoir ; Freshwater ; Crayfish ; Bacterial infection ; Aeromonas hydrophila ; Staphylococcus aureus ; Micrococcus luteus ; Flavobacterium johnsonae
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 32
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