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  • 1
    Electronic Resource
    Electronic Resource
    Age, growth and reproduction of the Caspian roach (Rutilus rutilus caspicus) in the Anzali and Gomishan wetlands, North Iran (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 21 (2005), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The hypothesis of environmentally related life history variations between two Rutilus rutilus caspicus populations was investigated by comparing Gomishan and Anzali populations along the southern shores of the Caspian Sea. The roach growth rate in the Anzali wetland was higher than in the Gomishan wetland. There were significant differences in growth patterns between males and females from both wetlands, however the sex ratios were not significantly different. Fecundity or reproductive investment (Gonadosomatic index – GSI) of the Gomishan roach was significantly more than the Anzali roach. In both areas the absolute fecundity was significantly positive correlated to age and total length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.2005.00669.x
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  • 2
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    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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  • 3
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    Mudskipper species Diversity of the Khur-e-Abee Protected Area, Hormozgan Province (2018)
    Details
    Publication Date: 2021-05-19
    Description: Mudskipper species diversity in the Khur-e-Abee protected area in the coastal areas of the Persian Gulf in Hormozgan Province was studied monthly. Sampling was done from March 2011 to February 2012 is 56º 24' 58” E, 27º 11' 28” N geographical position. A total of 730 specimens belonging to 3 species and 1 family werecollected by hand. Three species were identified; Boleophthalmus dussumieri, Scartelaos tenuis and Periophthalmus waltoni. The monthly sampling of mudskipper species composition showed that S. tenuis (45.75%), P. waltoni (30.48%) and B. dussumieri (26/02%) were first, second and the third in abundance respectively. Shannon species diversity index (1.09), Simpson index (0.62) and Pielou species index (0.99) were highest in October Whereas the Margalef species richness index (0.62) was the highest in December.
    Description: Published
    Keywords: Biodiversity ; Mudskipper ; Periophthalmus waltoni ; Scartelaos tenuis ; Boleophthalmus dussumieri ; Species ; Diversity ; Area
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-7
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  • 4
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    Reproductive biology of Indian squid, Uroteuthis duvauceli (Orbigny, 1835), in the northern Gulf of Oman (2018)
    Details
    Publication Date: 2021-05-19
    Description: Some aspects of the reproductive biology of the Indian squid, Uroteuthis duvauceli, were studied from June 2006 to May 2007. A total of 1200 specimens were collected from approximately 30-80m depths by trawling in 50 stations, of which 360 samples were studied for sex determination and fecundity. The minimum and maximum total and mantle length, and body weight were recorded in December and June, respectively. The highest range of total length (410-420mm), mantle length (150-160mm and body weight (90-100g) were encountered in September. The specimens were composed of 34% male and 66% female (M:F=1:2). This species was found to be more abundant in summer. The minimum and maximum ovary weighs were 2.1g and 7.9g with an average of 4.9g, respectively. These values for nidamental gland weight were 0.70 and 2.61g with an average of 1.6g. The minimum and maximum absolute fecundity were 25510 (in August) and 375600 (in April), respectively. These values for relative fecundity were 5207 (in April) and 867 (in August), respectively. The highest gonadosomatic index (GSI) was in April (14.38) and the lowest was in July (8.63). This squid is, therefore, assumed to be a spring spawner. Minimum and maximum egg diameter were 0.72mm (in August) and 2.5mm (in April), respectively.
    Description: Published
    Keywords: Indian squid ; Uroteuthis duvauceli ; Fecundity ; GSI ; Sex ratio
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.85-96
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  • 5
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    Reproductive biology of blue swimming crab, Portunus segnis (Forskal, 1775) in coastal waters of Persian Gulf and Oman Sea, Iran (2018)
    Details
    Publication Date: 2021-05-19
    Description: A reproductive biology study of blue swimming crab, Portunus segnis (Forskal, 1775) in the northern Persian Gulf and Oman Sea, was conducted from May 2010 to October 2011. The results showed that the annual sex ratio is not M: F=1:1, with 51.9 % female. All the five stages of ovarian development of P. segnis were observed throughout the year. The size of ovigerous crabs varied from 103 to 155 mm. carapace width. This crab can spawn all year round with a spawning peak in mid-winter to early of spring season. The fecundity of ovigerous crabs ranged from 521027 to 6656599 eggs, with average fecundity of 2397967 eggs. The minimum carapace width (CW) of female crabs that reach sexual maturity was 92-138 mm and the length at which 50% of all ovigerous females was 113 mm carapace width.
    Description: Published
    Keywords: Biology ; Physiology ; Sex ratio ; Sexual maturity at size ; Spawning season ; Fecundity ; Portunus segnis
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.430-444
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  • 6
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    Some ecological indices of the Caspian Sea Amphipoda at the different depths Guilan offshore (2018)
    Details
    Publication Date: 2021-05-19
    Description: In the present study, some ecological factors were studied for Amphipoda at different depths. The Shannon, Margalef, and Hill indices were used to determine the species diversity, richness and evenness, respectively. In addition, the association and niche overlap values were estimated. Indices of species richness and diversity were highest at 50 and 100m depths, respectively. The ordination of depths show that the highest dissimilarity was at 20m depth and the lowest dissimilarity at 100 meter. Results of interspecific association and specific overlap of species show that only a few species could have similar ecological requirements. Results show that Paraniphargoides derzhavini with Niphargoides grimmi and Stenogammarus compersus with Amathilina cristata had low associations. Corophium spinulosum with Corophium nobile and Stenogammarus compersus with Paraniphargoides derzhavini, however, had high associations.
    Description: Published
    Keywords: Amphipoda ; Diversity ; Interspecific association
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.49-62
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  • 7
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    Short communication:Population structure of green tiger prawn, Penaeus semisulcatus (De Haan) in Bushehr waters, Persian Gulf (2018)
    Details
    Publication Date: 2021-05-19
    Description: This article has no abstract.
    Description: Published
    Keywords: Population genetics ; Penaeus semisulcatus ; Bushehr waters
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.337-341
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  • 8
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    Nursery grounds of Green Tiger Prawn (Penaeus semisulcatus, De Haan, 1844) in Bushehr coastal waters of the Persian Gulf, Iran (2018)
    Details
    Publication Date: 2021-05-19
    Description: Nursery grounds of Penaeus semisulcatus were surveyed in the main coastal prawn catching areas of the Bushehr waters, Persian Gulf, from July 2003 to March 2005. Sampling stations were selected in waters less than 10m deep and juveniles were collected using a small vessel powered by a 150 hp outboard engine that was equipped with a small beam trawl net with 10 mm mesh size. Prawns less than 15 mm carapace length were classified as juvenile. The catches of P. semisulcatus juveniles were abundant at only a few sites in the shallow waters around southern (Motaf) and middle (Helaileh) regions of the studied area. The maximum number of juveniles was seen in July and November 2003 that amounted to 596 and 24 specimens, respectively. In April and June 2004, only 43 and 85 specimens were recorded respectively. Juvenile abundance was higher in vegetated sites as compared to other sites during this study. The study supports the fact that the extensive shallow reef and open flat coastline areas that are covered with grass and algae communities are critically important for the prawn and should therefore be protected from pollution, fishing gear damage and industrial development.
    Description: Published
    Keywords: Nursery grounds ; Penaeus semisulcatus ; Juveniles ; Aquatic communities ; Shallow water ; Abundance ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.133-146
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  • 9
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    Study of spawning season and spawning ground of soboor (Tenualosa ilisha, Ham. Bunch., 1822) during its migration in Khuzestan rivers (2018)
    Details
    Publication Date: 2021-05-19
    Description: During 12 months of sampling, from 17 stations, 327 specimens of Soboor fish Tenualosa ilisha, including 120 females, 113 males and 86 immature were caught. Total length (TL) of the fishes was 120-500mm. Maximum diameters of soboor ova 0.795mm and the ova with diameter more than 0.7 mm released at one spawning round. Temporal and spatial distribution of ova diameter corresponding to GSI changes showed that ova with diameters between 0.64 to 0.795 mm released spontaneously in many rounds along fish migration route during its spawning season. The results indicate that the spawning of soboor begins upon its entering to Bahmanshir and Arvand Rivers on April and continued up to Shushtar and Dezful cities on September where their migration route and season are ended.
    Description: Published
    Keywords: Tenualosa ilisha ; Spawning season ; Ova diameter ; GSI
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.89-102
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  • 10
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    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.
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