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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 shrimp Nursery grounds in Bushehr waters (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Study of shrimp nursery ground in the Northern part of Bushehr province from Farakeh creek to Genaveh The fourth phase of "study of shrimp nursery ground in the Northern part of Bushehr province" was carried from October 2000 to August 2001. Sampling was carried for larval stages by using Bongo net with 500 micrometer mesh size, and for adults with Trawl net of I centimeter mesh size. In 12 stations, 25576 juvenile and adult shrimp and 651.13 larves were collected and identified. Most of these samples belonged to the families of Sergestidae, Penaeidae Caridea. Acetes cfsergestidae family, both in adults and larval stage (57% for adult and 84% for larval stage) were identified. Adults wrere caught only in Ramleh creek in Feb. 2001, and the most presence of Acetes' larvae were also in Ramleh creek in Dec. 2000. 33% of adults were belonged to Metapenaus stebbingii of Penaeidae family. The most presence of this species was in Feb. and Mar. 2001. Although no larvae of this species was found in the field, it seems there is no significance between pH, salinity and area temperature with the presence of these species of shrimp.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Shrimp ; Nursery ; Larval stage ; Sergestidae ; Penaeidae ; Caridea
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 66pp.
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  • 4
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    Investigation of biology of tiger shrimp in different depths of the Persian Gulf (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Investigation ; Biology ; Tiger shrimp ; Shrimp ; Depth ; Penaeus monodon
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 47pp.
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  • 5
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    Study of Tagging Effects on Surviving Rate of Caspian Trout (Salmo trutta caspius) Fries Before Releasing to Natural Habitat (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Study of tagging effects on survival rate of Caspian trout (Salmo trutta caspius) fries before releasing to natural habitat was a part of a large research plan on conservation and restoration of Caspian trout stocks in the Southern Caspian by Coldwater Fishes Research Center. Catching brooders, propagation, larvae and juvenile rearing were carried out in Southern coasts and rivers of Caspian sea and in shahid Bahonar propagation center in Kelardasht, Mazandaran (North of Iran) in autumn 2012. 150 fries for each treatment (5, 10 and 20 g fries and Plastic T tag, elastomer tag and control treatments) anesthetized, weighed (g), measured (mm), tagged, disinfected and introduced to cement ponds. Fries were kept and fed for 5 days and their behavior and responses to food, infection of wound and mortality were recorded. No mortality were observed in all treatments, fries were shocked for few hours after handling and did not take food but they started to feed from the first day after tagging and there was no infection in macroscopic observation of wound.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Caspian trout ; Salmo trutta caspius ; Tagging ; T tag ; Elastomer tag ; Surviving Rate ; Fries ; Natural Habitat ; Survival rate ; Coldwater ; Propagation ; Larvae ; Juvenile ; Rearing ; Mortality
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 30pp.
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  • 6
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    Frequency distribution of Penaeus semisulcatus and Penaeus merguiensis in the catch of breeder shrimp trawlers in Jask and Sirik area, Oman Sea (2018)
    Details
    Publication Date: 2021-05-19
    Description: Collection of breeder shrimps in important fishing grounds of Hormozgan province was started in 1994. In this research which was carried out in March, April, June and July 2001 and 2002, we aimed at identifying shrimp species, determining frequency distribution of the species in the catch and evaluating caught maturity stages. We collected data on the catch of artisanal shrimp trawlers on a biweekly basis. Result showed that Penaeus indicus was dominant in the catch while P. semisulcatus and P. merguiensis comprised 20.5-20% and 13.5-19.5% of the catch in Jask and Sirik areas respectively. A Tukey test showed that average carapace length in P. merguiensis and P. semisulcatus caught in Jask were significantly larger than those from Sirik area (p〈 0.05). Maximum abundance of P. semisulcatus and P. merguiensis spawners was found during March to June in Jask and June to July in Sirik fishing grounds.
    Description: Published
    Keywords: Penaeus semisulcatus ; Penaeus merguiensis ; Shrimp ; P. semisulcatus ; P. merguiensis ; Fishing ; Species ; Maturity
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.215-222
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  • 7
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    Ecological Interaction Between Commercial Fishes in the Persian Gulf (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: An ecosystem-based management fishery is a new way of looking at management of living resources. Trophic levels of basic food items, feeding habits, growth and mortality rate of 20 exploited fish species (including commercial and bycatch) are investigated in the Persian Gulf (from the provinces of Khuzestan, Bushehr and Hormozgan,) from 2010 to 2012. The model considers trophic interactions among 12 functional group of the ecosystem involving Phytoplankton, Zeoplankton, Cephalopods, Shrimp, Infauna Benthos, Epifaunal Macrobenthos, Demersal Zoobenthos Feeders, Small Pelagic Planktivorous Fish, Benthoplagic Feeder, Piscivorous, Large Benthic Carnivores And Small Benthic Carnivores. In general 7452 of stomach contents samples were analyzed based on the weight and numerical method and were detected about 40 preys. The results demonstrated gaps in our knowledge on the food web structure. The mean trophic levels were varied from L. klunzingeri (2) to S. tumbil (4.64), while the total catch of some species were fluctuating widely. Result of our study showed that Total mortality varied between 0.45 per year (A. suppositus) to 9.5 per year (P. indicus) and food consumption rate also fluctuated by 1.9 (L. johni ) to 89 (L. lineolatus). The results indicated that some fish species including sardine, Anchovies, small carangids, S. stridens with high frequency in ecosystem, have been occupied in the food web as a wasp-waist. The model showed that most hunters groups live in middle levels in the food web such as N. japonicas, A. latus, P. kaakan, L. nebolusus, P. indicus and T. lepturus . Analysis the catch rate during 2001-2011 reveled that there is a clear trend of declining most of fish species catches in this research except for T. lepturus, P. kaakan and sparids which lead to upset the fundamental ecological balance of the Persian Gulf in future.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Ecological ; Commercial ; Trophic level ; Functional group ; Prey ; Trophic interaction ; Fish
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 131pp.
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  • 8
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    Evaluation of the large pelagic fishes (Scomberidae family) for optimum exploitation level in the Persian Gulf (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Reproductive biology, Diet and population dynamics parameters of narrow-barred Spanish mackerel, Scomberomorus commerson, in the Persian Gulf were studied during 2011-2012. Fork length frequencies were collected from the commercial catch and from the current fishery nets (gill nets with 9 and 14cm mesh size) at the landing places. During 5 periods in October, December, March, April and July 20-40 specimens were also purchased from the fishermen at several landing sites to investigate and recording of data for feeding and reproductive conditions. Fork length (FL) of 2742 fishes was recorded to the nearest cm and weight of the specimens were measured to the nearest 0.01kg. FiSAT program was used to assess growth and mortality parameters. Reproductive maturity stages were assessed macroscopically using a five element scheme based on gonad size and appearance. The numbers of ovaries were fixed and preserved in 10% formalin. Central sections were embedded in wax, sectioned Hematoxylin–Eosin stains. For this subset, gonad maturation was categorized histological using a simplified five-stage description scheme and compared with the macroscopic assessments for validation. A Gonosomatic index (GSI) was also calculated for each fish. Feeding condition results showed that, sardines are the major prey of S. commerson. Pony fishes, Haltbeak and Indian mackerel were observed in the stomach content. These preys can be assumed as a secondary or accidental food items. Liver Somatic Index (HSI) was maximum in April and minimum in July. The annual instantaneous rate of fishing mortality (F= 0.42 year^−1) was considerably greater than the target (Fopt= 0.28) and limit (Flimit= 0.37) biological reference points, suggesting that the stock is heavily overexploited. Feeding and nutrition results showed that sardines are the major items prey of king S. commerson. Ponyfish, haltbeak and Indian mackerel fishes were observed in diet that can be considered as secondary or accidental foods. Maximum and minimum of Kn index was in October (9.3) and in March respectively. Liver Somatic Index (HSI) was the highest rate in February (1.70) and the lowest in July (0.85) that indicated on the worst and the best condition of fish in the mentioned periods respectively. No difference was observed in the weight stomach index and weight index (SI) in two sexes and it was about 0.09. The smallest of fish was observed 17cm FL and the biggest was 152cm FL. The mean size of fork length frequency was observed from maximum108cm (SD= 24) in February to minimum 29.4cm (SD= 5.5) in September. Based on growth curve analysis, growth parameters, K and L∞ were estimated 0.23year^−1 and 156.45 cm respectively. Instantaneous total mortality (Z), was 1.13 year^−1 . The estimate of M was 0.43 year^−1 and thus, the estimate of F was0.7 year^−1 . This translates to an exploitation rate (F/Z) of 0.69 year^−1 . Target (Fopt) and limit (Flimit) biological reference points were calculated 0.17 year^−1 and 0.22 year^−1 respectively. The size at capture at a probability of 0.25 (L25), 0.5 (L.5) and 0.75 (L.75) was35.84 cm, 40.28cm and 61.98 cm respectively. Tmax was calculated as 3/K equal to 6 years. Matured females (Stages III, IV) were observed between mostly between April to July. By July, most fishes were in ripped and spent stages (StagesIV, V) indicating the end of the spawning season. The result of GSI avtivity in 153 male and female fish indicated the higest reproductive activity from April to July with the peak of July. The present study results shows that the highest of catch rate were done in 1 and 2 years olds of fish.Although exploitation rate have not indicated over fishing but Fopt and Flimit rates are less than fishing mortality that shows overexploitation was happened. Changes of the mesh size in thegillnet of 9cm and the size of the nets should be considered. Banning of the king mackerel catch in the June and July that is the spawning peak period can be helped to the brood stocks.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: King fish Scomberomorus commerson ; Diet ; Reproductive biology ; Population dynamics ; Narrow-barred Spanish mackerel ; Scomberomorus commerson
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 50pp.
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  • 9
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    Study forming of growth rings in the Caspian bony fishes (Step 1: Common carp Cyprinus carpio Linnaeus, 1758) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: The ichthyology studies at fish tagging was referred to more than 100 years ago. Tagging is utilized for the estimation of stock amount, population frequency and project or calculating of survival and growth value. There are many various methods for fish tagging are used for juvenile to adult fish. The current study was carried out at Ghare-su research station during 2011-2013. 250 of carp fingerlings (Cyprinus carpio ) were tagged by bath with tetracycline manner (pH=6, 500mg/l). The fork length and weight of fish were 10-12 mm and 2-4 g, respectively. Also, fish were fed twice a day. The second and third tagging stages were performed at November 2012 and July 2014, respectively. After otolith was extracted, it was washed water and dry at lab room air. The tagged rings or loops (annuali) were observed by lab loupe with 10X and 40 X magnifications. The results showed that a narrow band was formed after the first tagging of carp fingerlings, as it was seen at the end of otolith edge. It was demonstrated that tetracycline was absorbed and the tagged ring or loop (annuli) was newly formed at external or out of othlith edge. There was not observed any fish death, when carp fingerlings were tagged by OTC bath manner. It said that the first OTC band will be seen, the first sign of the formed OTC band was observed at external margin of otoilith after 6th month , of course , from 4th month, this sign was formed at the most external of otoilth edge but with added the following region, it can be hardly distinguished. The formed band in relative to second tagging was similar to the first band but there was no discrepancy or difference with together.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Cyprinus carpio ; Oxytetracycline ; Tagging ; Otolith ; Growth
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 38pp.
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  • 10
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    Feasibility Study of developing puffed snack from trimmed part of Silver carp (Hypophthalmichthys molitrix) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Incorporation of silver carp (Hypophthalmichthys molitrix) meat in extruded puffed corn-fish snack was studied. Fish protein concentrate (FPC) was produced by liquid-solid extraction. Ethanol and isopropanol were used as the solvents. FPC extraction efficiency of 19.5% and 9.5% (w/w) were obtained based on fish meat and whole fish respectively. Protein content of isopropanol extracted FPC (93.3%±0.4) significantly (P〈0.05) was higher than ethanol extracted (92.5%±0.3) FPC. On the contrary fat contents were 0.17%±0.4 and 0.65%±0.11 respectively. Puffed corn-fish snack with 2 and 4% FPC as well as 5, 10, 15, and 20% minced fish meat in corn grits was extruded by a single screw extruder. The best formula was evaluated at 15% fish meat and 85% corn grits in the snack base, considering higher protein content, higher consumer acceptability, higher expansion ratio and lower fish smell. Six month storage stability “same as control” was obtained considering chemical, microbial and sensory evaluation according to standard of Institute of Standards and Industrial Research of Iran; when Metalized Biaxillary-Oriented Poly Propylene was used as the packaging material. Incorporation of abdominal muscles (8% of whole fish body which obtained from trimming of fish fillets) on corn-fish snack was not feasible due to low-protein (11.7±0.1 i.e. 34% less than fish meat) and high-fat (14.2±0.1 i.e. 550% higher than fish meat) contents.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Snack ; Fish ; Silver carp ; Fish Protein Concentrate ; Extrusion ; Feasibility ; Hypophthalmichthys molitrix
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 47pp.
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