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  • 1
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    Survey on stocks of Caspian Sea mullets ( Liza aurata ; Liza saliens ) in Iranian coastal waters of the Caspian Sea (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: This study was conducted to determine growth parameters, catch and fishing effort trends, stock assessment and Acceptable Biological Catch (ABC) of Caspian Sea mullets in the Iranian coastal waters of Caspian Sea in the fishing season of 2012-2013. For gathering of data on biometry and catch statistics, 5 mobile working group in the regions of Anzali , Kiashahr , Nowshahr , Babolsar and Torkmen were involved from the start to the end of fishing season.Gathered data Were entered to the computer. For data analysis , common methods were undertaken for estimation of growth parameters , mortality rates , biomass and Maximum Sustainable yield ( MSY ) and Acceptable Biological Catch ( ABC ) as well. . According to the result, the number of beach seines cooperatives was 124 and fishing efforts were 45260 beach seining haul . The catch per unit of effort CPUE) was calculated 37 kg/haul during this fishing season . The total catches of Caspian Sea mullets (including illegal fishing estimated as 2151 mt. Growth parameters of golden gray mullet ( Liza aurata ) were estimated as K=0.12 /yr, L∞ = 59.24 cm, t0 = - 1.31 /yr. Based on catch-at-age data, in the fishing season of 2012-2013 , the total biomass, from the biomass-based cohort analysis were estimated 11321.6 mt. The reference points of F0.1 and F30% were estimated 0.3 /yr . based on these results , the fishing mortality rate in fishing season of 20122013 were very closed to these reference points . In this survey , the Maximum sustainable yield and Acceptable biological catch were estimated as 2207.7 and 1981.4 mt respectively .Results of biometry of leaping gray mullet (Liza saliens) showed that the mean length and weight of this species were 28.8 ± 3.4 cm and 230.5 ± 74.8 g respectively . Based on these results and due to decline of golden gray mullet stocks , it is recommanded to reduce fishing effort and harvest keep to the level of MSY and ABC .The study of spawing condition of golden gray mullet in new situation of this species is also recommanded .
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Biological ; Mullet ; Growth parameters ; Biomass ; Acceptable biological catch ; Survey ; Stocks ; Liza aurata ; Liza saliens ; Mortality rates ; CPUE ; Illegal fishing ; Golden gray mullet ; Spawning
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 60pp.
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  • 2
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    Study of some biological characteristics of golden grey mullet (Liza aurata) in Iranian Coastal waters of the Caspian Sea (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: During last 65 years the catch of mullets had increasing trends with some fluctuations in the Iranian coastal water of the Caspian Sea .In this period about 138 thousand tons of mullets have been caught. Mullet’s account for 35% of total catch annually .In recent years species composition of mullets has chanched in the Iranian coastal water of the Caspian Sea and catch composition of golden grey mullet increased from 76% in 1995 to 98% in 2006. In this survey some biological characteristics of golden grey mullet have been studied in Iranian coastal water of the Caspian Sea .Fish samples have been gathered from commercial catch of beach seine cooperatives monthly in Iranian coastal water of the Caspian Sea over 2006 and 2007. In the laboratory fishes have been measured biometrically and biological parameters have been calculated .Also catch statistics of mullets during 2006-2007 have been obtained and discussed. Results showed that the catch of mullets in beach seine cooperatives during 2006 and 2007 was 4181 and 3685 tons respectively that golden grey mullet contribute 99% and 98% of the catch composition of mullets respectively. Length range of golden grey mullet caught by beach seine cooperatives was 19-50.2 cm with mean length of 32.7 ± 6.4 (± SD) and weight range was 67-1475 gr with mean weight of 411 ± 255 gr. The age structure of this species was comprised 2-10 years old fish with mean age of 4.42 years old. In this survey totally the sex ratio of male:female of golden grey mullet was 356: 434 that was significant variation from equal sex ratio. Pick of the spawning in Guilan province was in October and in Mazandaran and Golestan provinces was in November. In October the proportion of spawning females declined from western area (Guilan province) towards eastern parts (Golestan province).The highest proportion of spawning females was in December in Golestan province. The highest GSI index value was observed in September and October and it was decreased in November and December and it was consistent during January till April. The mean absolute fecundity was 700881 ± 429987 eggs with minimum and maximum fecundity of 200112 and 2282862 eggs respectively. The Lm 50% for female golden grey mullet was calculated as 33.6 cm.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Biological ; Commercial ; Golden grey mullet ; Liza aurata ; Species ; Survey ; Samples ; Male ; Female ; Sex ratio ; Spawning ; GSI ; Fecundity ; Coastal waters
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 56pp.
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  • 3
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    Stock assessment of Caspian mullets in the Iranian waters of the Caspian Sea (2015-2017) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: This study was conducted to determine growth parameters, catch and fishing effort trends and stock assessment of mullets in the Iranian coastal waters of Caspian Sea in the years 2015-2016 and 2016-2017. According to the result, the numbers of beach seines were 123 and 120 and their fishing efforts were observed 43588 and 42230 beach seining, respectively. The total catches (including illegal fishing) were also obtained 1542 mt and 2505 mt during 2015-2016 and 2016-2017, respectively. The mean (± SD) of fork length were observed 33.4±5.24 and 33.3±5.72 cm and for total weight were 395.8±142.8 and 395.5±264.52 g in 2015-2016 and 2016-2017, respectively. The frequency of immature individuals were observed 14.2 and 15.7 percent during two sampling period, respectively. The range of age was from 2 to 11 year and fish with 4 to 6 years comprised up to 75.4 and 70 percent, respectively. In fork length – weight relationship a and b were calculated 0.029 and 2.690 for 2015- 2016 and 0.0207 and 2.7914 for 2016-2017, respectively. The Growth parameters of golden gray mullet were K=0.16/yr, L∞ = 64.3 cm, t0 = -0.26/yr. The total and naturaly mortality, Z and M, were calculated 0.81 and 0.35, respectively. Based on catch-at-age data, in the years 2015-2016 and 2016-2017, the total biomass, from the biomass-based cohort analysis were estimated 8170 mt and 7960 mt for golden gray mullet, respectively. In the years 2015-2016 and 2016-2017, the instantanuse fishing mortality F, were 0.25 and 0.46 year-1 and explotation ratio were 0.46 and 0.57, respectively.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Mullets ; Growth parameters ; Mortality ; Biomass
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 60pp.
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  • 4
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    Stock assessment of the bony fishes in Iranian coastal waters of the Caspian Sea (2007-2010) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: In the years 2007-2007, 2008-2009 and 2009-2010 the exploitation of bony fishes resources (by 131 beach seines) started on 12 October but finished on 9 April, 9 April and 13 April, respectively. During these periods the total catch of bony fishes were 23537.8, 20045.5 and 18664.8 tonnes, respevtively. During these periods, kutum predominated and represented the highest proportion of total catch at 73.1, 74.0 and 66.9% , followed by golden grey mullet at 18.3, 13.9 and 18.7%, respectively. K values calculated 0.22, 0.15 and 0.14 year-1 and L∞ were 66.0, 62.7 and 70.0 cm for kuttum, golden grey mullet and common carp, respectively. The instantaneous coefficient natural mortality were estimated as 0.386 and 0.35 year-1 for kutum and golden grey mullet, respectively. During three periods, the exploitation rates were 0.789, 0.584 and 0.614 for kutum and 0.71, 0.75 and 0.61 for golden grey mullet, respectively. In the years 2007-2007, 2008-2009 and 2009-2010, the total biomass, from the biomass-based cohort analysis were 56600, 62090 and 61590 tonnes for kutum and and MSY estimated about 24733.7 and 8550.4 tones for kuttum and 11040, 11900 and 14460 tonnes for golden grey mullet, respectively. The ABC (acceptable biological catch) were estimated as 8000 and 2200 tonnes.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Bony fishes ; Growth ; Mortality ; Biomass ; Acceptable biological catch ; Kutum ; Golden grey mullet ; Common carp ; Coastal waters
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 96pp.
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  • 5
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    Limnological study of the Kan River in the catchment area of the Persian Gulf Martyrs Lake (Chitgar), Tehran (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: This study focused on identification phytoplankton, zooplankton, benthos, fishes and relationship between biotic and abiotic parameters at three stations in the Kan river during 2014. This study identified 19 phytoplankton taxa. The findings showed, the diatoms abundance were dominated in the river. The chlorophytes abundance were recorded the lowest abundance in this study. The nutrients and water temperature were the significant abiotic parameters to increase cyanophytes and chlorophytes abundance in the Kan river. This study identified 26 zooplankton taxa. The Rotatoria and Protozoa abundance were dominated in the Kan river. Based on CCA, there was no correlation between abundance zooplankton and abiotic parameters. The biodiversity index of plankton was between 1.8 and 2 and the lake situation is located in the mesotrophic category. The study of the Kan river fishes showed, only one endemic fish species Capoeta bohsei. The length (between 38 and 270 mm, average 144±86 mm) and weight (between 1.1 and 356 g, average 108.8±146.7 g) of the C. bohsei were varied during the study period. The 19 benthos taxa were identified. The Ephemeroptera was most abundant in the benthos groups. The classification of river based on biology indicator and environmental parameters confimed that water quality is located in the moderate category.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Limnological ; Phytoplankton ; Zooplankton ; Benthose ; Fish ; Water quality ; Martyrs Lake
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 72pp.
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  • 6
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    Study of Parasites occurrence and intensity in fishes of Anzali Lagoon (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Tish survey prolonged from summer 2011 trough summer 2012. During this period 574 samples of different fish species were investigated for their parasites. Totally 30 species of parasites isolated of the fishes. Some of the isolated parasites are recorded for the first time in Iran. Rafidascaris acus Orientocreadium siluri, Silurotaenia siluri, Acanthocephalus lucii , Argulus foliaceus has recorded for the first time from European catfish, Silurus glanis, and Dactylogyrus inexpectatus has recorded for the first time from Gibel Carp, Carassius auratus gibelio, in Anzali wetland. Statistical comparison of parasites infections and intensity between the different area of Anzali wetland were done. Infection of Pike, Esox lucius, to Diplostomum spathaceum, Raphidascaris acus and Monogenean in western parts of wetland were significantly different from the Eastern and Central areas (p〈0.05). So based on the data have concluded the eastern and central regions of the wetland are more polluted than the western part. Comparing the results of the present study with before ones showed that the composition of parasite species has been changed over time, while the prevalence, intensity and abundance of parasites have been increased. It may be due to changing environmental conditions such as increasing discharge of effluent, eutrophication of the wetland. This results accents to necessity of reconstruction of Anzali wetland with preference of eastern and central regions.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Parasites ; Fish ; Infection ; Intensity ; Survey ; Samples ; Species ; Rafidascarisacus ; Orientocreadium siluri ; Silurotaenia siluri ; Acanthocephalus lucii ; Argulus foliaceus ; Catfish ; Gibel carp
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 42pp.
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  • 7
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    Biological survey of Caspian kutum (Rutilus kutum) released fingerlings in Sefidroud river (Guilan Province) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Kutum fish (Rutilus kutum) is an anadromous cyprinid species that spawns in adjusted rivers to the Caspian Sea. Many million fingerlings were artificially produced and annually released in these rivers specifically in Sefidrud River by Iranian Fisheries Organization. In this study were estimated the staying period of Kutum fingerlings in Sefidrud River and its diet and growth. A small piece of the caudal fin was cut as a tagging method. About 50000 and 5200 individuals were marked during July and September 2013, respectively. The marked fish had an average total length 53.2±5.6 mm and body weight 1.11±0.26 g and were released in river around two kilometers of the estuary. The sampling of fishes had been earlier started from Feb. 2012 and continued until Feb. 2013 at five stations. Four stations were along river from three Kilometer of estuary to estuary and one station was in right side of estuary in the sea coast. The results showed that marked samples after releasing time were distributed in all studied area from 3 kilometers of estuary to estuary but they migrate mainly toward Caspian Sea in a short time. However the marked samples were observed in estuary and the sea coast after 6 and 24 hours of their releasing time, respectively, Kutum fingerlings remained in Sefidrud river ecosystem in a longer time, at least until end of our sampling period i.e. 105 days. The coefficient of vacuity index of the natural feeding study was 0.0, 49.0 and 30.6 % for phytoplankton, zooplankton and benthos, respectively. The average of GastroSomatic index, intensity of fullness and condition factor were calculated 6.30±3.25, 174.6±153.2 and 0.92±0.09, respectively. A temporal and spatial variation on main food items were observed in gut content of fish fingerlings from different locations and seasons. Gut contents were generally included 59 genera of phytoplankton, 15 groups of zooplankton and 10 groups of benthos. Nitzschia, Navicula and Synedra were dominated among phytoplankton genera with 45.83, 18.02 and 15.99 %, respectively. Among zooplankton groups; the Rotaria, Moeina and Difflugia were dominated with 22.30, 20.86 and 15.83%, respectively. Chironomidae and Gammaridae were the main food items among fed benthic animals with 83.67 and 11.15%, respectively. Furthermore 48 phytoplankton genera, 32 zooplankton genera and 6 benthic families were identified in ecosystem of Sefidrud river. Bacillariophyta phylum (with 23 genus), Rotatoria (with17 genus) and Chironomidae family were dominated in each mentioned groups, respectively. It is concluded that the Kutum fingerlings stay in Sefidrud River for a long time, although most of them migrate to Caspian Sea during first month after releasing. However dietary indices were normal in studied samples, the condition factor index seems to be low.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Rutilus kutum ; Fingerlings ; Kutum ; Fish ; Rotaria ; Moeina ; Difflugia ; Phytoplankton
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 160pp.
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  • 8
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    Survey on stocks of Caspian Sea mullets ( Liza aurata ; Liza saliens ) in Iranian coastal waters of the Caspian Sea (2018)
    Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-05-19
    Description: This study was conducted to determine growth parameters, catch and fishing effort trends, stock assessment of Caspian Sea mullets in the Iranian coastal waters of Caspian Sea in the fishing season of 2013 - 2014. For gathering of data on biometry and catch statistics, 5 mobile working group in the regions of Anzali , Kiashahr , Noshahr , Babolsar and Torkmen were involved from the start to the end of fishing season.Gathered data Were entered to the computer. For data analysis , common methods were undertaken for estimation of growth parameters , mortality rates , biomass and Maximum Sustainable yield ( MSY ) as well. . According to the result, the number of beach seines cooperatives was 124 and fishing efforts were 44688 beach seining haul . The catch per unit of effort CPUE) was calculated 53 kg/haul during this fishing season . The total catches of Caspian Sea mullets (including illegal fishingestimated as 2373 mt. Growth parameters of golden gray mullet (Liza aurata ) were estimated as K=0.16 /yr, L∞ = 57.4 cm, t0 = - 0.45 /yr. Based on catch-at-age data, in the fishing season of 2013-2014 , the total biomass, from the biomass-based cohort analysis were estimated 12473.3. mt. Based on these results , the fishing mortality rate in fishing season of 2013-2014 were 0.575 /yr . In this survey , the Maximum sustainable yield were estimated as 2558.6 mt respectively . Generally from three Northern province's cooperatives 3406 sampels collected.Results of biometry of golden gray mullet (Liza auratus) showed that the mean length and weight and age of this species were 32.3 ± 6.1 cm and 383.5 ± 74.823.4 g and 1.2 ± 5.6 y respectively and leaping gray mullet (Liza saliens) showed that the mean length and weight and age of this species were 24.8 ± 3.3 cm and 119 ± 25.5 g and 2.5 ± 0.6 y respectively . The biometric results showed that ,97.5 % of the samples belonged to golden gray mullet and population of leaping gray mullet was sever declined. Also , the fishing of the mullet was increased over the last year by 10.3 % from 2151 tones to 2373 tones per year during 1391-92 and 1392-93 , respectively .
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Iranian waters of the Caspian Sea ; Mullets ; Caspian Sea mullets ; Liza aurata ; Growth ; Mortality ; Parameters ; Biomass ; Biometry ; Golden gray mullet
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 50pp.
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  • 9
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    The biological parameters and stock assessment of kilka in Iranian waters of the Caspian Sea (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: In this investigation which had been done in commercial catch regions (where discharged theirs catch) in three ports Babolsar, Amirabad (in mazandaran) and Anzali (in Guilan).The main objectives of the present study were to estimate of catch and catch per unit effort, von Bertalanffy growth parameters, condition factor, sex ratios, spawning, biomass and maximum sustainable yield of common kilka in Iranian waters of the Caspian Sea. The result shown that catch of kilka in Iranian coastal in 2015 increased from 21553 ton to 22428 ton in 2016 and CPUE was 2.6 and 2.7 ton (Vessel ×Night) respectively . Common kilka was the predominant all months of the year about 98 percent. The mean length was 103±9.6 at the same time and range length 92.5–112.5 mm were the dominant population (about 82%). The mean condition factor was 1.38±0.1 . Age abundance during this period have not been substantially changed and always fishes with 3 and 4 year olds had the highest frequency78.5 and 76.8 percent respectively. The parameters of the Von Bertalanffy growth curve were 138[1 exp ] 0.251( 1.124)   t Lt for common kilka. The instantaneous coefficient of natural mortality (M) was 0.506 yr-1 . The instantaneous coefficient of fihing mortality and total mortality were 0.753 yr-1 and 1.259 yr-1 , respectively. The exploitation rate of common kilka were 0.60 during 2015-2016. In the years 2014-2015 and 2015-2016, the biomass of common kilka was estimated 86401 and 71671 ton, respectively. In these years, fish of the 2nd and 3rd year of this fish had the highest amount of reserves (respectively 29025 and 24632 ton) and The lowest reserves for 6-year-old fish, respectively, were 772 and 355 tons respectively. The breeders biomass of this species is 37132 and 34390 tons respectively and The ratio of biomass of broodstocks to the whole was 43% and 48% respectively. Acceptable Biological Catch was estimated with a precautionary approach of 18,400 tons. The average catch of this species on the coast of Iran in the last 10 years has been more than 21,000 tons, and in fact, the optimal level of harvesting from the reserves has not been observed. It should be noted that when exploiting a storage facility, excessive harvesting of the harvestable product will lead to the destruction of longterm storage.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Kikla fishes ; Stock ; Growth parameters ; Biomass ; Acceptable biological catch ; Biological parameters
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 48pp.
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  • 10
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    Biological aspects of Kilka (Age, Growth,Feeding and Reproduction) in Southern of Caspian Sea (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: In the changing environmental of the Caspian Sea specifically pelagic zone following the introduction of the comb jelly Mnemiopsis leidyi has been continued ,particularly kilka catch ,biological characteristic and feeding . In this investigation which had been done in commercial catch regions ( where discharged theirs catch) in three ports Babolsar ,Amirabad (in Mazandaran) and Anzali (in Guilan ), estimated catch and catch per unit effort , the age structure of catch ,length- weight relationship , von Bertalanffy growth parameters , condition factor ,sex ratios ,maturity stags ,age at first capture and spawning and feeding .The result shown that catch of kilka in Iranian coastal in 2006 decreased from 22300 ton to 16700 ton in 2008.But CPUE increased from1.7 ton (Vessel ×Night) to 2.5 ton at that time due to dropped effort .The length frequency of kilka is close and the juvenile fish did not see in catch as increased the length mean (P〉0.000).The age frequency had the same situation as fish low than 2 years did not see for anchovy and bigeye ,so collapse juvenile stock cause poor recruitment in the species .The parameters of the von Bertalanffy growth curve were For common kilka L∞= 136.5mm k= 0.249y t0= 1.890y Q= 3.883; For bigeye kilka L∞= 131.7mm k= 0.346 t0= 1.123y Q= 3.688; And for anchovy kilka L∞= 148mm k= 0.375 t0= 1.243y Q= 3.814 The exploitation rate of anchovy, bigeye and common kilka were 0.51, 0.58 and 0.6 respectively. The highest of GSI recorded in May and March for common and bigeye and in Jul, Nov for anchovy kilka .Main prey was Acartia tonsa by anchovy and common kilka and Cypris balanus by bigeye kilka. We concluded that the ecological problem causes by Mnemiopsis leidyi as well as overfishing has been collapsed kilka stocks, particularly anchvy.so sustainable fisheries management and conservation biodiversity in the Caspian Sea are real challenges now.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Biological ; Environmental ; Commercial ; Ecological ; Kilka fishes ; Age ; Growth ; Feeding ; Overfishing ; Pelagic zone ; Mnemiopsis leidyi ; Bertalanffy ; Sex ratios ; Maturity ; Spawning ; CPUE ; Acartia tonsa ; Cypris balanus
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 98pp.
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