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  • Species  (7)
  • Iranian Fisheries Science Research Institute  (7)
Collection
Keywords
Publisher
  • Iranian Fisheries Science Research Institute  (7)
  • Tehran, Iran  (7)
Years
  • 1
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    Unknown
    Study of Mnemiopsis leidyi diet and reproduction in the southern coasts of Caspian Sea (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Mnemiopsis leidyi is one the species of comb-jelly. It belongs to the Ctenophore phylum and lobate order. Mnemiopsis leidyi first appear in the Black Sea in 1980s and reached to the biomass levels up to 1.5-2 kg m2 in the summer of 1989. This species is food rival of pelagic fish. It has been reported that the ctenophore caused the dramatic decrease of zooplankton and pelagic fish stock in the Black Sea. In this study, sampling on Mnemiopsis leidyi, zooplankton and phytoplankton started from July to December 2002 from a total of 2 stations located Anzali and Khazarabad by METU net in the Iranian Coasts of the Caspian Sea. Experimental studies on Mnemiopsis have indicated that Mnemiopsis begins to produce eggs in the Caspian Sea, when it reaches length about 15 mm. Although eggs were obtained even from specimen with 12 mm length and weight of 0.5 g. The most abundant size of reproducing Mnemiopsis was 20-30 mm in the Caspian Sea. Average fecundity of M.leidyi in the Caspian Sea was 1174±741 eggs/day with maximum 2824 eggs/day for specimens with length group of 30-39 mm and the weight about 2.0-2.7 g. Percentage of hatched eggs was not high in experiments with M.leidyi the range from 9 to 92 % after 24 hours. The maximum produce egg of M.leidyi measured with mean 845±733 eggs/day in Salinity of 11 ppt and the minimum egg recorded with mean 2 eggs/day in salinity of 4 ppt. The results showed that the biomass of M.leidyi had some fluctuation in different months and its maximum biomass was recorded in August with a figure of 384±156 g.m2 and the minimum biomass was observed in December with a figure of 87±46 g.m2. The gut contents of Mnemiopsis leidyi showed a wide variety of prey including 84 % of zooplanktons and 16% of Phytoplanktons. The most abundance of intaked foods was Acartia (belong to Copepoda) with 34 % and the least was podon polyphemoides (belongs to Cladocera) with 0.74 %. Also 3.0 % of fish eggs and 4.2 % of Lamllibrachia were found among stomach contents. The young specimen (5〈 mm) consumed more zooplanktons and phytoplanktons comparing to adult ones. Copepoda was dominant zooplankton in the Iranian coasts of the Caspian Sea. Fecundity of Mnemiopsis showed correlation to the length and wet weight in the Caspian Sea and reproduction of M.leidyi was done small size in comparing with other area in the Caspian Sea. Salinity, water temperature and food availability is the most important factor in producing eggs in M.leidyi. It seems, that Mnemiopsis leidyi feeding has been one of the most important factor in declining zooplankton populations and Clupeonella stocks.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Experimental ; Mnemiopsis leidyi ; Diet ; Reproduction ; Species ; Ctenophore ; Phylum ; Biomass ; Pelagic fishes ; Zooplankton ; Phytoplanktons ; Copepoda ; Cladocera ; Salinity ; Temperature ; Comb jellie
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 45pp.
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  • 2
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    Unknown
    Comprehensive study on probability of controlling Caspian Sea invasive Ctenophora (Mnemiopsis leidyi) (Activity 2: Investigation on Mnemiopsis leidyi diet in the Caspian Sea) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Mnemiopsis leidyi is one the species of comb-jelly. It belongs to the Ctenophore phylum and Lobate order. It is a purely marine, free-swimming animal with a transparent jelly-like walnut-shaped body, which was transported from the Black Sea into Caspian possibly at the end of 1990s. This species is food rival of pelagic fish. It has been reported that the ctenophore caused the dramatic decrease of zooplankton and pelagic fish stock in the Black Sea. In this study, sampling on Mnemiopsis leidyi, zooplankton, phytoplankton was conducted from December 2003 to March 2005, from a total of 11 stations located along four transects (Anzali , Khazarabad, Tourkman and Gorgan Bay) by METU net in the Iranian coasts of the Caspian Sea. Clupeonella catch was done by light fishing with fishing vessel in Anzali region. The results showed that the biomass of M.leidyi had some fluctuation in different seasons and its maximum biomass was recorded in summer with a figure of 524.4±156.2 g.m2 Tourkman region and the minimum biomass was observed in winter with a figure of 5.15±1.81 g.m2 in Anzali region. Study of stomach of Mnemiopsis showed, that Acartia (belonged of Copepoda with 66 %), lamlibranchia (13 %) has the highest frequency and the lowest were Balanus nauplii, Rotatoria, Tintinnopsis and Podon polyphemoides. The maximum mean abundance of zooplankton was 29368±24318 n.m3 in winter (Anzali region) and the minimum was recorded 4170±5014 n.m3 in summer (Tourkman region). Copepoda was dominant zooplankton in the Iranian coasts of the Caspian Sea. Chrysophyta with 150000000±440000000 n.m3 and Euglenophyta with 260000±521000 n.m3 had the highest and the lowest frequency respectively in the Caspian Sea. The main foods of Clupeonella were Acartia with 80 %. The survey of stomach of Clupeonella showed that the feeding of these species was not good and the highest fullness index was recorded 220.95±314.67. These results showed, the main food item of Ctenophora and Clupeonella were Copepoda (Acartia). It seems, the impact of Mnemiopsis leidyi feeding has been the important factor in declining zooplankton populations, Clupeonella stocks, and also increasing of phytoplankton abundance.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Ctenophora ; Mnemiopsis leidyi ; Diet ; Species ; Phylum ; Pelagic fishes ; Sampling ; Zooplankton ; Phytoplankton ; Acartia ; Ctenophora ; Population ; Abundance
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 53pp.
    Location Call Number Expected Availability
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  • 3
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    Unknown
    Study of Mnemiopsis leidyi diet and reproduction in the southern coasts of Caspian Sea (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Mnemiosis leidyi is one the species of comb-jelly. It belongs to the Ctenophora phylum and Lobata order. Mnemiopsis leidyi first appear in the Black Sea in 1980s and reached to the biomass levels up to 1.5-2 kg m2 in the Summer of 1989. This species is food rival of pelagic fish. It has been reported that the ctenophora caused the dramatic decrease of zooplonkton and pelagic fish stock in the Black Sea. In this study, sampling on Mnmiopsis leidyi, zooplankton and phytoplankton started from July to December 2002 from a total of 2 stations located Anzali and Khazarabad by METU net in the Iranian Coasts of the Caspian Sea. Experimental studies on Mnemiopsis have indicated that Mnemiopsis begins to produce eggs in the Caspian Sea, when it reaches length about 15 mm. Although eggs were obtained even from specimen with 12 mm length and weight of 0.5 g. The most abundant size of reproducing Mnemiopsis was 20-30 mm in the Caspian Sea. Average fecundity of M.leidyi in the Caspian Sea was 1174±741 eggs/day with maximum 2824 eggs/day for specimens with length group of 30-39 mm and the weight about 2.0-2.7 g. Percentage of hatched eggs was not high in experiments with M.leidyi the range from 9 to 92 % after 24 hours. The maximum produce egg of M.leidyi measured with mean 845±733 eggs/day in Salinity of 11 ppt and the minimum egg recorded with mean 2 eggs/day in salinity of 4 ppt. The results showed that the biomass of M.leidyi had some fluctuation in different months and its maximum biomass was recorded in August with a figure of 384±156 g.m2 and the minimum biomass was observed in December with a figure of 87±46 g.m2 . The gut contents of Mnemiopsis leidyi showed a wide variety of prey including 84 % of zooplanktons and 16% of Phytoplanktons.The most abundance of intaked foods was Acartia (belong to Copepoda ) with 34 % and the least was podon polyphemoides (belongs to Cladocera) with 0.74 %. Also 3.0 % of fish eggs and 4.2 % of Lamllibrachia were found among stomach contents.The young specimen (5〈 mm) consumed more zooplanktons and phytoplanktons comparing to adult ones. Copepoda was dominant zooplankton in the Iranian coasts of the Caspian sea. Fecundity of Mnemiopsis showed correlation to the length and wet weight in the Caspian Sea and reprodaction of M.leidyi was done small size in comparing with other area in the Caspian Sea. Salinity, water temperature and food availability is the most important factor in producing eggs in M.leidyi. It seems, that Mnemiopsis leidyi feeding has been one of the most important factor in declining zoolankton populations and Clupeonella stocks.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Mnemiopsis leidyi ; Diet ; Reproduction ; Species ; Ctenophora phylum ; Lobata ; Biomass ; Pelagic ; Ctenophora ; Zooplonkton ; Acartia ; Copepoda ; Podon polyphemoides ; Cladocera ; Salinity ; Temperature ; Clupeonella
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 45pp.
    Location Call Number Expected Availability
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  • 4
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    Unknown
    Limnological survay of Anzali wetland data during 1990-2003 by use of GIS system (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Anzali wetland at south west of Caspian located along of North West and southeast and with its unique feature were add on the Ramsar convention list in 1975. There were recorded a high rich of fauna and flora including 276 plant species, 23 reptiles and amphibians, 60 fishes, 26 mammals and 195 birds. Anzali wetland were encountered with numerous disorder with the eutrophication and the early dismissing. The first studies on Anzali wetland started by many international institutions in 1964. In this study the data of biotic and abiotic factors in Anzali wetland analyzed which belongs to different sites (15 to 38 stations) during 1991 to 2000 and were sampled seasonally or monthly in different years. The results showed the increasing trend of phytoplankton abundance from 7.9 to 66 million C./l. and the western part had the most abundant. The Cyanophyta had the most development than other 7 phylum observed in the area. In Anzali wetland identified 143 phytoplankton genus that 9 genus dominated in more than 80 % replicates and 7 genus had the abundance of more than 5 million cell/l. The Zooplankton abundant increased from 580 to 2200 ind./l. The Rotatoria had the most abundant followed by Copepoda. There was identified 104 zooplankton genus that 5 genus were dominated in more than 80 % replicates and 11 genus had the abundance of more than 30 ind./L. The chlorophyll a varied from 8.8 to 50.2 μg/l. and had a increasing trend after 1996, meanwhile it was measured higher than 25 μg/l in most of the stations. The results of benthic study showed that the Chironomidae and Tubificidae were observed more than other organisms which comprised 12.2 to 23.5% of total biomass of benthic organisms in studied period. The range of biomass was 1.1 to 7.8 g/m2. The ichthyologic survey showed presence of 60 species that 11 species were exotic. 28 species belong to freshwater, 17 species were anadromous and 8 species were resident in estuary. The highest and lowest fish catch were 640 and 288 ton in 1994 and 1999 respectively and it was about 500 ton at the end of period. The hydrochemical factors had the various fluctuation so that the nutrients parameters had a significant difference over studied period. Total nitrogen was varied from 0.78 to 1.41 mg/l and total phosphorus varied from 0.05 to 0.1 μg/l.. The oxygen dissolved amount was from 4.6 to 8.7. EC was between 3 to 5 ms/cm during September and October that indicated of Caspian water projection. According to geographic position of station, all biotic and abiotic data, were arranged. The data bank is used by Idrisi software to produce of necessary maps. Analysis of data showed that there must be a responsible department with a vast authority. Conservation and eutrophication prevention of Anzali wetland connect to special attention to catchment area and landuse management of the wetland. Also there is an urgent need for well-developed technologies and managements to reduce the organic pollution and its environmental impacts on the Anzali Lagoon.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Environmental ; Limnological ; Survey ; GIS ; Fauna ; Flora ; Cyanophyta ; Phylum ; Phytoplankton ; Zooplankton ; Chlorophyll a ; Biomass ; Species ; Hydrochemical ; Nutrients ; Dissolved oxygen
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 123pp.
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  • 5
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    Unknown
    Limnological survey of Anzali Wetland data during 1990-2003 by use of GIS system (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25200 | 18721 | 2018-09-03 17:38:28 | 25200 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Anzali wetland at south west of Caspian located along of North West and southeast and with its unique feature were add on the Ramsar convention list in 1975. There were recorded a high rich of fauna and flora including 276 plant species, 23 reptiles and amphibians, 60 fishes, 26 mammals and 195 birds. Anzali wetland were encountered with numerous disorder with the eutrophication and the early dismissing. The first studies on Anzali wetland started by many international institutions in 1964. In this study the data of biotic and abiotic factors in Anzali wetland analyzed which belongs to different sites (15 to 38 stations) during 1991 to 2000 and were sampled seasonally or monthly in different years. The results showed the increasing trend of phytoplankton abundance from 7.9 to 66 million C./l. and the western part had the most abundant. The Cyanophyta had the most development than other 7 phylum observed in the area. In Anzali wetland identified 143 phytoplankton genus that 9 genus dominated in more than 80 % replicates and 7 genus had the abundance of more than 5 million cell/l. The Zooplankton abundant increased from 580 to 2200 ind./l. The Rotatoria had the most abundant followed by Copepoda. There was identified 104 zooplankton genus that 5 genus were dominated in more than 80 % replicates and 11 genus had the abundance of more than 30 ind./L. The chlorophyll a varied from 8.8 to 50.2 μg/l. and had a increasing trend after 1996, meanwhile it was measured higher than 25 μg/l in most of the stations. The results of benthic study showed that the Chironomidae and Tubificidae were observed more than other organisms which comprised 12.2 to 23.5% of total biomass of benthic organisms in studied period. The range of biomass was 1.1 to 7.8 g/m2. The ichthyologic survey showed presence of 60 species that 11 species were exotic. 28 species belong to freshwater, 17 species were anadromous and 8 species were resident in estuary. The highest and lowest fish catch were 640 and 288 ton in 1994 and 1999 respectively and it was about 500 ton at the end of period. The hydrochemical factors had the various fluctuation so that the nutrients parameters had a significant difference over studied period. Total nitrogen was varied from 0.78 to 1.41 mg/l and total phosphorus varied from 0.05 to 0.1 μg/l.. The oxygen dissolved amount was from 4.6 to 8.7. EC was between 3 to 5 ms/cm during September and October that indicated of Caspian water projection. According to geographic position of station, all biotic and abiotic data, were arranged. The data bank is used by Idrisi software to produce of necessary maps. Analysis of data showed that there must be a responsible department with a vast authority. Conservation and eutrophication prevention of Anzali wetland connect to special attention to catchment area and landuse management of the wetland. Also there is an urgent need for well-developed technologies and managements to reduce the organic pollution and its environmental impacts on the Anzali Lagoon.
    Keywords: Limnology ; Iran ; Caspian Sea ; Anzali wetland ; Ramsar ; Anzali Lagoon ; Limnological ; Survey ; GIS ; Fauna ; Flora ; Cyanophyta ; Phylum ; Phytoplankton ; Zooplankton ; Chlorophyll a ; Biomass ; Species ; Hydrochemical ; Nutrients ; Dissolved oxygen
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 123
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  • 6
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    Unknown
    Comprehensive study on probability of controlling Caspian Sea invasive ctenophora (Mnemiopsis leidyi) (Activity 2: Investigation on Mnemiopsis leidyi diet in the Caspian Sea) (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25091 | 18721 | 2018-08-22 07:12:26 | 25091 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Mnemiopsis leidyi is one the species of comb-jelly. It belongs to the Ctenophore phylum and Lobate order. It is a purely marine, free-swimming animal with a transparent jelly-like walnut-shaped body, which was transported from the Black Sea into Caspian possibly at the end of 1990s. This species is food rival of pelagic fish. It has been reported that the ctenophore caused the dramatic decrease of zooplankton and pelagic fish stock in the Black Sea. In this study, sampling on Mnemiopsis leidyi, zooplankton, phytoplankton was conducted from December 2003 to March 2005, from a total of 11 stations located along four transects (Anzali, Khazarabad, Tourkman and Gorgan Bay) by METU net in the Iranian coasts of the Caspian Sea. Clupeonella catch was done by light fishing with fishing vessel in Anzali region. The results showed that the biomass of M.leidyi had some fluctuation in different seasons and its maximum biomass was recorded in summer with a figure of 524.4±156.2 g.m^2 Tourkman region and the minimum biomass was observed in winter with a figure of 5.15±1.81 g.m^2 in Anzali region. Study of stomach of Mnemiopsis showed, that Acartia (belonged of Copepoda with 66 %), lamlibranchia (13 %) has the highest frequency and the lowest were Balanus nauplii, Rotatoria, Tintinnopsis and Podon polyphemoides. The maximum mean abundance of zooplankton was 29368±24318 n.m3 in winter (Anzali region) and the minimum was recorded 4170±5014 n.m3 in summer (Tourkman region). Copepoda was dominant zooplankton in the Iranian coasts of the Caspian Sea. Chrysophyta with 150000000±440000000 n.m3 and Euglenophyta with 260000±521000 n.m3 had the highest and the lowest frequency respectively in the Caspian Sea. The main foods of Clupeonella were Acartia with 80 %. The survey of stomach of Clupeonella showed that the feeding of these species was not good and the highest fullness index was recorded 220.95±314.67. These results showed, the main food item of Ctenophora and Clupeonella were Copepoda (Acartia). It seems, the impact of Mnemiopsis leidyi feeding has been the important factor in declining zooplankton populations, Clupeonella stocks, and also increasing of phytoplankton abundance.
    Keywords: Biology ; Iran ; Caspian Sea ; Gorgan Bay ; Bandar Tourkman ; Khazarabad ; Anzali ; Ctenophora ; Mnemiopsis leidyi ; Diet ; Species ; Phylum ; Pelagic fishes ; Sampling ; Zooplankton ; Phytoplankton ; Acartia ; Ctenophora ; Population ; Abundance
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 53
    Location Call Number Expected Availability
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  • 7
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    Unknown
    Study of Mnemiopsis leidyi diet and reproduction in the southern coasts of Caspian Sea (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25090 | 18721 | 2018-08-23 05:48:30 | 25090 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Mnemiopsis leidyi is one the species of comb-jelly. It belongs to the Ctenophora phylum and Lobata order. Mnemiopsis leidyi first appear in the Black Sea in 1980s and reached to the biomass levels up to 1.5-2 kg m^2 in the summer of 1989. This species is food rival of pelagic fish. It has been reported that the ctenophora caused the dramatic decrease of zooplankton and pelagic fish stock in the Black Sea. In this study, sampling on Mnemiopsis leidyi, zooplankton and phytoplankton started from July to December 2002 from a total of 2 stations located Anzali and Khazarabad by METU net in the Iranian Coasts of the Caspian Sea. Experimental studies on Mnemiopsis have indicated that Mnemiopsis begins to produce eggs in the Caspian Sea, when it reaches length about 15 mm. Although eggs were obtained even from specimen with 12 mm length and weight of 0.5 g. The most abundant size of reproducing Mnemiopsis was 20-30 mm in the Caspian Sea. Average fecundity of M.leidyi in the Caspian Sea was 1174±741 eggs/day with maximum 2824 eggs/day for specimens with length group of 30-39 mm and the weight about 2.0-2.7 g. Percentage of hatched eggs was not high in experiments with M.leidyi the range from 9 to 92 % after 24 hours. The maximum produce egg of M.leidyi measured with mean 845±733 eggs/day in Salinity of 11 ppt and the minimum egg recorded with mean 2 eggs/day in salinity of 4 ppt. The results showed that the biomass of M.leidyi had some fluctuation in different months and its maximum biomass was recorded in August with a figure of 384±156 g.m2 and the minimum biomass was observed in December with a figure of 87±46 g.m^2 . The gut contents of Mnemiopsis leidyi showed a wide variety of prey including 84 % of zooplanktons and 16% of Phytoplanktons.The most abundance of in taked foods was Acartia (belong to Copepoda) with 34 % and the least was podon polyphemoides (belongs to Cladocera) with 0.74 %. Also 3.0 % of fish eggs and 4.2 % of Lamllibrachia were found among stomach contents. The young specimen (5〈 mm) consumed more zooplanktons and phytoplanktons comparing to adult ones. Copepoda was dominant zooplankton in the Iranian coasts of the Caspian Sea. Fecundity of Mnemiopsis showed correlation to the length and wet weight in the Caspian Sea and reproduction of M.leidyi was done small size in comparing with other area in the Caspian Sea. Salinity, water temperature and food availability is the most important factor in producing eggs in M.leidyi. It seems, that Mnemiopsis leidyi feeding has been one of the most important factor in declining zooplankton populations and Clupeonella stocks.
    Keywords: Biology ; Ecology ; Iran ; Caspian Sea ; Anzali ; Khazarabad ; Mnemiopsis leidyi ; Diet ; Reproduction ; Species ; Ctenophora phylum ; Lobata ; Biomass ; Pelagic ; Ctenophora ; Zooplonkton ; Acartia ; Copepoda ; Podon polyphemoides ; Cladocera ; Salinity ; Temperature ; Clupeonella
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 45
    Location Call Number Expected Availability
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