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  • 1
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    Determination of growth parameters, mortality and CPUE of Capoeta capoeta in Hassanloo reservoir (2021)
    In:  http://aquaticcommons.org/id/eprint/23832 | 18721 | 2018-07-27 16:41:50 | 23832 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: The study was conducted to determine growth parameters, mortality, length frequency, age structure and catch per unit effort (CPUE) of Capeota capeota in Hassanloo reservoir in western Azerbaijan. Fish sampling was done seasonally in 2004-2005 by gill net with mesh sizes 20, 30, 40, 50, 60mm. The results showed age compositions of the fish were 1-5 years old. Average length and weight were estimated at 31.81±0.54cm and 601.30±20.49g, respectively. The range of total length and weight were 19-48cm and 120-1550g. The growth parameters were L.=53.086cm, t_o = -0.2898, K= 0.4120. Total mortality (Z), natural mortality (M) and fishing mortality (F) were 0.76, 0.58 and 0.18 per year, respectively. Growth in length and weight of Capoeta capoeta population in Hassanloo reservoir compared better than the same age fish in other ecosystems of the region. Average CPUE for 100m gill nets in 24 hours was estimated at 11.81kg.
    Keywords: Fisheries ; Gill net ; Length frequency ; Age structure ; Western Azerbaijan ; Hassanloo reservoir ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 17-26
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  • 2
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    The ichthyofauna of Anzali Lagoon (2021)
    In:  http://aquaticcommons.org/id/eprint/23945 | 18721 | 2018-08-01 17:54:26 | 23945 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: The present study on the Ichthyofauna of Anzali Lagoon carried out from 1992-94 revealed that 13 families, 36 genera and 42 species and sub-species of fish inhabit the lagoon and its connected rivers their whole life, part of it or immigrate to these waterbodies for reproduction purposes. The Cyprinidae family composes 59.5% of the lagoon's ichthyofauna (21 genera and 25 species and sub-species). Species such as Cyprinus carpio and Esox lucius are the native species of the Anzali Lagoon, while other species, e.g. Rutilus frisii kutum, immigrate to the lagoon from the Caspian Sea. Carassius auratus and Hemiculter leucisculus have been introduced to this aquatic ecosystem unintentionally together with Pseudorasbora parva. A number of the observed species in the Anzali Lagoon have been introduced to this aquatic ecosystem for certain reasons, i.e. cambating Anopheles mosquito Gambusia holbrooki, reducing the aquatic plant Ctenopharyngodon idella, increasing the stocks (Silver carp and Big head carp). Both resident and anadromous population of Stizostedion luciperca, Barbus capito and Cyprinus carpio were observed in the Anzali Lagoon, while other marine species, e.g. Liza aurata and Atherina boyeri had entered the ichthyofauna of the lagoon due to the rising water level of the Caspian Sea and the increment of salinity in the lagoons connecting rivers. Appearance and abundance of Abramis brama and Stizostedion luciperca indicate that the ecological condition of the lagoon is improving.
    Keywords: Biology ; Ichthyofauna ; Genera ; Species ; Fish ; Cyprinidae ; Cyprinus carpio ; Esox lucius ; Rutilus frisii kutum ; Carassius auratus ; Hemiculter leucisculus ; Aquatic ; Pseudorasbora parva ; Anopheles mosquito ; Gambusia holbrooki ; Ctenopharyngodon idella ; Silver carp ; Big head carp ; Stizostedion luciperca ; Luciobarbus capito ; Liza aurata ; Atherina boyeri ; Abramis brama ; Ecosystem ; Appearance ; Abundance ; Ecological ; Anzali Lagoon ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
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    Format: 83-94
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  • 3
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    Length frequency, sex ratio and relative abundance (CPUE) of Astacus leptodactylus in Arass Reservior (1997-98) (2021)
    In:  http://aquaticcommons.org/id/eprint/23994 | 18721 | 2018-08-02 12:11:43 | 23994 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: The length frequency, sex ratio and CPUE of Arass reservoir crayfish have been studied during a one year research project in 1997-98. Comparison of Arass crayfish with the same species of crayfish dwelling in freshwater habitats of Turkey, Turkamenistan, Caspian sea region and also in Anzali lagoon, The Arass crayfish were higher in length and weight. The average length and weight were 120.50±0.96mm and 54.68±1.53 gr, respectively (n=3219, confidence interval 95%). In the samples, the smallest crayfish measured 78mm and weighted 12.3 gr and the largest crayfish had 186mmlength and 239.6 gr weight. In the crayfish traps 83.2% of catch exceeded the standard commercial size. The sex ratio during spawning period (December-May) dominated by males and in other months the females had superiority in the catch. In general consideration the sex ratio during the project life dominated by males (1:1.33, n=35454). The CPUE in August was the highest and the least in January (in order of 10.32 and 0.15 crayfish per one trap in 24 hours respectively). The catching operation occured in the depth of 2.5-17.5m in the ecosystem, and CPUE were the highest the depth of 75m. Considering the CPUE data, the desirable catch occured in the August, September and October. Positive relationship between water temperature and CPUE observed, and optimum catch were occured when the water temperature ranged between 16-26ᵒC.
    Keywords: Biology ; Fisheries ; Astacus leptodactylus ; CPUE ; Arass Reservoir ; Anzali Lagoon ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
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    Format: 49-64
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  • 4
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    Some biological aspects of Caspian Sea crayfish Astacus leptodactylus eichwaldi in Bandar Anzali coastal zone (2021)
    In:  http://aquaticcommons.org/id/eprint/24827 | 18721 | 2018-07-17 01:47:47 | 24827 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Among crayfish species only Astacus leptodactylus eichwaldi Bott, 1950, is found in Bandar Anzali coastal area. The research survey carried out during 2001-2002, by designing twelve transects (transects covered the depth of 35, 45, 55 and 65m). Foldable traps being used to catch crayfish. The maximum abundance of crayfish was caught at the depth of 40-60m. The average length and weight measured 125.6±0.2mm and 60.6±0.3g. The length and weight range were 72-169mm and 12.5-148g, respectively. Sex ratio during studying period favoured females with 1:0.86. The ovarian and pleopodal eggs calculated 308.98±10.62 and 255.54±10.87, respectively. The fecundity result obtained from A. leptodactylus eichwaldi population showed resemblance to its Turkmenistan counterpart. With the increase of weight in females the number of eggs in each gram of body weight (relative fecundity) is reduced. The breeding season in the studied area occurred in 21th January to 22th July. First moulting in males happened in July and the second moulting which are simultaneous with females occurred 11th-30th September. Length group 120-129mm were dominant in population and length frequency analysis showed six age groups among the crayfishes in studied area September. Length group 120-129 mm were dominant in population and length frequency analysis showed six age groups among the crayfishes in studied area. Average CPUE in the mentioned year was 2.54 individuals per trap per 24 hours. At present no harvest of crayfish taken-place, CPUE data showed that the density of crayfish between transects of 1-7 have been relatively considerable, and it is recommended that after carrying out stock assessment survey, the exploitation of crayfish resources can be programmed.
    Keywords: Biology ; Fisheries ; Caspian Sea crayfish ; Astacus leptodactylus ; Transect ; Biological aspect ; CPUE ; Caspian Sea ; Bandar Anzali ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 129-148
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  • 5
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    Analyzing the effects of aquaculture and rebuild aquatics stocks on fisheries development in the Caspian Sea (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25412 | 18721 | 2018-09-23 15:56:29 | 25412 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Using SWOT analysis with traditional matrix and quantitative matrix methods, the strategies to benefit from strengths and opportunities to vanishing weaknesses and decrease of threats for strategic management of aquaculture in Iranian Northern provinces was surveyed. Utilizing researches held in fisheries research centers and existence of aquaculture experts in vicinity, activation of veterinary organization in production and post production, and entering new brood stocks with desirable growth are the main strategies for developing rainbow trout and Chinese carps culture in Iranian Northern provinces. In sturgeon fishes culture, independence of farms from fingerlings produced by governmental complex and diversification the cultured fishes using new species and hybrids can develop this part of aquaculture. Avoiding illegal fishing in sea and rivers, preserving the population of Caspian Sea fishes, entering new fish species which their resources are decreased extremely to breeding and fingerling production cycle, and using pike perch and bream while they migrate to Anzali Lagoon from Caspian Sea, instead of freshwater brood stocks will cause the output of sea enhancement and sea ranching activities to increase, and fisheries return coefficient of these fishes will rise. Using quantitative matrix and scoring method, it was defined that aquaculture in Iranian Northern provinces are extremely approved and acceptable and the score of strengths is more than weaknesses and opportunities more than threats. By using strategic management, these activities can be more developed.
    Keywords: Management ; Iran ; Caspian Sea ; Anzali Lagoon ; SWOT ; Strategic management ; Aquaculture ; Sea enhancement ; Sea ranching ; Traditional matrix ; Quantitative matrix ; Fisheries ; Survey ; Culture ; Species ; Illegal fishing
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 504
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  • 6
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    A preliminary study on fecundity of fresh water crayfish (Astacus leptodactylus) in Arass water reservoir, I.R. Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/22218 | 18721 | 2018-02-23 14:32:22 | 22218 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-30
    Description: A research study was conducted to investigate the number of ovarian eggs and estimate potential egg production of A. leptodactylus. In this study, mean number ovarian eggs 420.41±42.51 with the average total length to 121.93±4.27 mm (n=58). The mean pleopodal eggs were 322.04±29.61 with average total length of 119.14±3.94 mm (n=67). Comparison of the fecundity rate in different population of A. leptodactylus in different areas revealed that the Arass crayfish has a greater fecundity rate than others. The discrepancy between ovarian eggs and pleopodal eggs were 21% in Arass reservoir.
    Keywords: Biology ; Fisheries ; Crayfish ; Astacus leptodactylus ; Fecundity ; Monitoring programms ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-9
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  • 7
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    Biological survey of Chalcalburnus chalcoides guldenstadti spawning migration in Anzati Lagoon (2021)
    In:  http://aquaticcommons.org/id/eprint/23563 | 18721 | 2018-07-04 16:15:08 | 23563 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-14
    Description: Different biological forms of Chalcalburnus chalcoides, which is called sharnaya in Russian and saphidcooly in Persian, are distributed in the Caspian Sea, Aral Sea and Black Sea, The saphidcooly which live in the Caspian Sea scattered in the southern and western regions and enter the Kura and Terek Rivers in the northern coast for spawning (Berg. 1965). The Anzali lagoon saphidcooly is smaller in size compared with the Kura's population, but the results of this survey indicate that after maturation. The Anzali Lagoon saphidcooly show greater growth than the Kuras population. The migration for spawning to Anzali Lagoon commences in March with slow run, and reaches the peak in May and the beginning of June.
    Keywords: Biology ; Fisheries ; Biological ; Population ; Chalcalburnus chalcoides ; Anzali Lagoon ; Aral Sea ; Black Sea ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 39-52
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  • 8
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    Comparative study of opera house traps with funnel traps for catching Astacus leptodactylus in the Arass water reservoir (2021)
    In:  http://aquaticcommons.org/id/eprint/24284 | 18721 | 2018-08-04 07:12:28 | 24284 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Presently the crayfish fishermen in Arass water reservoir use only Funnel traps. This study was conducted in 2002, to aimed for evaluating the ability of catch, sex ratio and the size frequency of crayfish with the Opera House traps and Funnel traps. Forty Funnel traps including and forty Opera House traps have been set in 7.5 and 10m depth from May to July (in each depth combination of 20 number of the two type traps). The linking rope also the stone being used to stream line traps in the bottom of lake. The results revealed no significant differences (p 0.01) between the average length and weight of the crayfish caught with the two types of trap in different months of the year. The CPUE with Opera House traps was greater than with Funnel traps and the number caught in 24 h in one trap of the former type was 2.26 number higher, which was significantly higher than Funnel traps . A greater quantity of male crayfish was caught with Opera House traps, but compared with Funnel traps in respect of mate crayfish catch, the difference was not significant (P 0.05). Crayfish more than 120mm length (minimum standard size for commercial Arass crayfish) in Opera House traps comprised 87.56% of the catch, while by Funnel traps, the fi2tire was 69.90 °A3. Considering these finding, it is proposed that the crayfish fisherman in Arass be allowed to use Opera House traps, because thei., are more likely to improve crayfish population sustainability.
    Keywords: Fisheries ; Arass Crayfish ; Opera House trap ; Funnel traps ; CPUE ; Sex ratio ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 103-114
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