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  • Articles  (28)
  • Biology  (19)
  • Mnemiopsis leidyi  (13)
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  • Articles  (28)
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  • 11
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    Study of benthic macro invertebrates in the Anzali lagoon (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25822 | 18721 | 2018-10-13 10:12:48 | 25822 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: The Anzali wetland (37.28N – 49.25E) with less than 100 km2 surface area is located in the southwestern shores of the Caspian Sea in the Guilan province. The benthic macro-invertebrates were studied as a part of a main project titled study of aquatic communities variation in the Anzali wetland. The sampling was performed at the 10 stations with using a Van-Veen grab during 2014-2015. The results showed, 14 macro-invertebrates taxa were identified as Chironomidae (Insecta, Diptera) and Tubificidae (Annelida, Oligochaeta), they were dominated in the wetland. The maximum and minimum densities of macro-invertebrates were observed with 609±1119 and 93.32±27.92 n/m^2 respectively at the stations 5 and 1. The silt-clay constitute more than 85 percentage of the wetland sediments with maximum of 93.2±27.92 percentage at the 2 station and minimum 72.21±27.92 at the 5 station. Kruskal Wallis non parametric test (sig. ≤0.05), revealed significant differences for all studied factors at stations while of %tom and grain size had no significant variation. The CCA analysis revealed no accordance of total organic matter (TOM ) and silt- clay percentage vectors with Tubificidae and total benthic frequencies, while Chironomidae frequency is in accordance. Intensifying eutrification process in the Anzali wetland has affected its biota as the benthic fauna are almost limited in to most tolerant taxa which reflect the day after day increasing pollution the Anzali wetland.
    Keywords: Biology ; Ecology ; Iran ; Caspian Sea ; Guilan Province ; Anzali wetland ; Macroinvertebrates ; Eutrification ; Aquatic ; Tubificidae ; Chironomidae ; Insecta ; Diptera ; Annelida ; Oligochaeta ; Benthic fauna
    Repository Name: AquaDocs
    Type: monograph
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  • 12
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    The mammals of Anzali Wetland in the Southern Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/21789 | 18721 | 2017-12-03 15:15:22 | 21789 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-07-01
    Description: Anzali Wetland as a listed habitat in Montreux Record, was investigated for the mammal fauna during Jan. 2015 - Jan. 2016. About 165 km of water bodies and 200 km around Anzali Wetland were patrolled, respectively. By applying different methods, such as direct observation, different signs recording, using different sampling traps,nets and camera traps, twenty mammal species were identified from 5 orders and 13 families. While Wild boar,Golden Jackal and Common otter were widely distributed, Common badger, Asiatic wildcat and Jungle cat were observed in some parts of this wetland. Six rodent species were recognized in different parts of the wetland. Among four identified bat species, Nathusius’s pipistrelle has been reported only from this region in Iran. The most commonly recorded bat species was the Soprano pipistrelle, a species hereto recorded only from two Iranian localities. Two recognized species from order Eulipotyphla; Caspian shrew and a mysterious mole are important due to their narrow geographical distribution range as well as their taxonomic situation. Although there was no quantitative or qualitative data from the past, our results show that the situation of many mammal species are not suitable, and some of them are being increasingly threatened.
    Keywords: Biology ; Ecology ; Anzali Wetland ; Distribution ; Mammals check-list ; Iran ; Mammals ; Caspian Sea
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
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    Format: 223-235
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  • 13
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    Study on species diversity and abundance of fishes in the Persian Gulf Martyrs Lake, Chitgar-Tehran (2021)
    In:  http://aquaticcommons.org/id/eprint/22129 | 18721 | 2018-03-12 03:51:32 | 22129 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-27
    Description: This study focused on population structure, species diversity and abundance of the Chitgar Lake fishes in October 2014. Based on the lake location fish samples were collected at 34 stations in water body. In this study, 8 families belonging to 18 species comprised of Cyprinidae (11 species), Cichlidae (one species), Loricariidae (one species), Pangasiidae (one species), Serrasalmidae (one species), Poeciliidea (one species), Salmonidae (one species), and Scaridae (one species) were identified. Among the fishes just one native fish from Capoeta bohsei species observed during the study. The dominant lake fishes were invasive species Hemiculter leucisculus, Alburnushohenackeri, Carassius auratus, Carassius gibelio and Pseudorasbora parva. The highest abundant fishes were H. leucisculus 62 % and A. hohenackeri 35 % by Seine net. Furthermore, those were dominant abundance (69 and 12 % respectively) in Gill net method. Finally, in Cast net method A. hohenackeri 38 %, Pseudorasbora parva 21 % and H. leucisculus 17 % were dominated in the shore region. The lowest abundant fishes were P. hypophthalmus and Parrotfish. Overall more than 90 % of the fish population were invasive and alien species. Thus, the presence of invasive fishes and lack of predator fishes in the Chitgar Lake might be reason for increasing of trophic level.
    Description: The fulltext document is in Farsi only so it has not been possible for AC Editors to check the metadata input.
    Keywords: Biology ; Fisheries ; Species diversity ; Abundance ; Fishes ; Chitgar Lake ; species ; Cyprinidae ; Cichlidae ; Loricariidae ; Pangasiidae ; Serrasalmidae ; Poeciliidea ; Salmonidae ; Scaridae ; Iran
    Repository Name: AquaDocs
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  • 14
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    Some biological aspects of Gammarus lacustris Sars, 1863 in Neur Lake Ardabeel province, Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/22417 | 18721 | 2018-04-06 20:00:51 | 22417 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-05
    Description: A biological study was conducted to find out about reproduction and feeding of G. lacustris in Neur Lake from northwest mountains of Iran. Plankton diversity, hydro-chemical factors and substrate characteristic were recorded monthly. Findings showed that reproduction period of this species was short and limited to May and the mean brood size was 10.2 ± 5.3 eggs per female. The hydro-chemical analysis showed the eutrophic characteristic of Neur Lake in which the average of total organic matter was 3.7 ± 3.0 percent. The phyla representative Bacillariophyta, Chlorophyta and Cyanophyta were observed throughout the study and Chlorophyta was the dominant group. Three zooplankton phyla Rotatoria, Ciliophora and Copepoda were abundant respectively. Study on diet using gut content resulted in identification of 15 plankton genera with some resemblance to planktons of the lake.
    Keywords: Biology ; Ecology ; Environment ; Gammarus lacustris ; Mountain lake ; Amphipoda ; Biology ; Neur ; Ardabeel province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
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    Format: 242-253
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  • 15
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    Zoobenthic invertebrate of Anzali Lagoon and their relation with organic matter of the bottom (2021)
    In:  http://aquaticcommons.org/id/eprint/23961 | 18721 | 2018-08-02 11:18:37 | 23961 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: The study was conducted in Anzali Lagoon (37 ̊ 28 N, 45 ̊ 25 E) in 38 stations during April 1994 to March 1996. In this study 13 biogroups were separated and counted. The abundance of most biogroups was very low, while that of the groups Chironomidae and Tubificidae were high and the abundance of the biogroup Amphipoda, Culicidae and Ephemeroptera was lower than the mentioned groups. Tubificidae was seen in all stations and all months of the year and its maximum density was 3740 organisms in each square meter. After Tubificidae the Chironomidae family had the second level of density. The total percentage of the organic substances of the bottom had not considerable changes in different month and its mean amount differed from 2.57% in the site of breakwater and the sea to 27.1% (maximum) in central portion of the lagoon. No considerable relation was observed between the amount of organic matter and the abundance of benthos in the region. According to the obtained results, Tubificidae and Chironomidae families showed little correlation with the bottom organic substances. The correlation of biogroup Ephemeroptera with the organic substances was greater than that of the 2 mentioned groups. Using the cluster type analysis and dendrograms made clear that the relation of biogroups Culicidae, Ephemeroptera and Tubificidae with the bottom organic substances was more than that of Chironomidae. Culicidae and Chironomidae showed close correlation with silt and clay of the bottom, but Tubificidae was more adaptable with the bottom fine particles.
    Keywords: Biology ; Ecology ; Zoobenthic ; Invertebrate ; Organic ; Biogroups ; Chironomidae ; Tubificidae ; Amphipoda ; Culicidae ; Ephemeroptera ; Density ; Organisms ; Benthos ; Substances ; Cluster ; Dendrograms ; Clay ; Adaptable ; Anzali Lagoon ; Iran
    Repository Name: AquaDocs
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    Format: 83-102
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  • 16
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    Investigation on meiofauna and substrate characteristic in the southern Caspian Sea (Guilan Province) (2021)
    In:  http://aquaticcommons.org/id/eprint/24128 | 18721 | 2018-08-03 07:31:22 | 24128 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Meiofauna with a size of 100-1000µ having important rule in food webs. This study was carried out in autumn and winter 1992 along 30 transects at depths of 10, 20, 50 and 100m. The sediment samples were collected by grab (0.1 m2 area). In addition to identification of meiofauna, the sediments were examined to determine T.O.M. and grain size parameters. The results showed that bivalvia, foraminifera, nematoda, ostracoda and copepoda were dominant taxa among 12 identified fauna groups, in which foraminifera and bivalvia were the most abundant. The nonparametric Kroscall-walis test showed significant difference among abundance of meiofauna in different depths. The depth of 20m had the most abundance and with increasing depth (5O and 100m), the abundance had a descending trend. The maximum and minimum mean abundance of meiofauna varied from 29315±37248 and 825±498 ind/10 em2 for depth of 10 and 100m, respectively. The substrate characteristics indicated that the depth of 50 and 10m included the most and the least organic matter. Also all depths indicated the same grain size and sediment composition was mostly silt. Most of meiofauna were found in substrates with 4 to 8 % organic matter.
    Keywords: Biology ; Ecology ; Meiofauna ; Caspian Sea ; Guilan Province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 119-132
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  • 17
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    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
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    Format: 53
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  • 18
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    Population structure study of Anzali wetland phytoplankton (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25675 | 18721 | 2018-10-08 08:56:12 | 25675 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Phytoplankton groups are very important producers in the Anzali lagoon that have a significant role in the quality of water and the need to be constantly study their sequence and density. The survey was conducted in six workstations March 1389-Feb 2012. Samples were taken for a liter of water with plicae (P.V.C) and fixed with formalin to 4% ratio. Five ml of the sample after becoming homogeneous, was sequestration for 24 hours in the laboratory and identified and counted by invert microscope. Based on the results of this reviews 67 genus (22, 26, 9, 5, 1, 2, 1, and 1 genus respectively of the Bacillariophyta, Chlorophyta, Cyanophyta branches, Cryptophyta, Euglenophyta Chrysophyta, Pyrrophyta, the Xanthophyta) were identified. The results showed that the phytoplankton density was the most in Sorkhankol and Komeh Aghajani stations with annual average of 24387483±5643414 and 20381250 ± 5488084 per liter respectively. The Bacillariophyta ( particularly Cyclotella) was dominant in all of stations but high density of blue green algae (Cyanophyta) in Komeh aghajani station from July to mid-October have caused the annual average of these phylum is more than Bacillariophyta. In General, the average density of phytoplankton was the highest in summer than other seasons and was the lowest value in the fall. The number of the genus identified in this survey is less than previous studies. Compare this survey with the last studies reviews shows that diversity is reduced in the current situation in the Anzali than previous studies. According to the statistical analysis of the Kruskal Wallis, the density of phytoplankton had no significant differences in the different months, stations and seasons (p〉0.05) but the phytoplankton phylums have significant differences (p〈0.05) together.
    Keywords: Biology ; Ecology ; Iran ; Anzali wetland ; Diversity ; Phytoplankton ; Density
    Repository Name: AquaDocs
    Type: monograph
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  • 19
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    Reproduction of the ctenophore, Beroe ovata, in the Caspian Sea water (2021)
    In:  http://aquaticcommons.org/id/eprint/22298 | 18721 | 2018-03-13 21:07:28 | 22298 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-02
    Description: The experiments with Beroe ovata showed that this ctenophore can survive and reproduce in the Caspian Sea water, though at far lower rate than in the Black Sea; larval growth in the Caspian Sea water was also slower and mortality higher. Maximum fecundity of 2210 and 240 eggs recorded in laboratories of Turkey and Iran, respectively. About 34 to 100% of eggs in the Caspian Sea water could not develop and hatch. Larvae were at different stages of development, usually with size between 1.2 to 2mm. The highest number of eggs and larvae were obtained in tanks where Beroe individuals were together with Mnemiopsis leidyi. The poor reproduction of B. ovata in the Caspian Sea water could be due to both the acclimation stress to low salinity and possible damage of individuals during the transportation.
    Keywords: Biology ; Fisheries ; Beroe ovata ; Reproduction ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
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    Format: 93-104
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  • 20
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    Short communication: Identification, distribution, abundance and species composition of fish in the Chitgar Lake (Tehran Province of Iran) (2021)
    In:  http://aquaticcommons.org/id/eprint/22893 | 18721 | 2018-05-31 22:36:53 | 22893 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-11
    Description: This study was conducted in the Chitgar Lake in 2014. Chitgar Lake, 130 hectares in area is an artificial lake located in the north-west of Tehran City, Iran. For the first time the seasonal sampling of fish was done by three fishing methods gill net, cast net and beach seine, and a random sample of 3160 fish was collected. Some morphometric and meristic factors of samples were studied in the laboratory, and the distribution, abundance and species composition were determined. According to the results obtained, 95% of fish population was comprised of aggressive species such as; Hemiculter leucisculus, Pseudoras boraparva and Alburnus hohenackeri. There are 14 fish species in the lake, 9 species of which belong to the Cyprinidae family, 2 species including Capoeta buhsei and Capoeta capoeta are the only native species.
    Keywords: Biology ; Ecology ; Chitgar Lake ; Fish species ; Distribution ; Abundance ; Species compositions ; Tehran Province ; Iran
    Repository Name: AquaDocs
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    Format: application/pdf
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    Format: 585-589
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