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  • Caspian Sea  (7)
  • 1
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    Feeding characteristics of Neogobius caspius in the south west coastline of the Caspian Sea (Gilan Province) (2021)
    In:  http://aquaticcommons.org/id/eprint/22360 | 18721 | 2018-03-27 22:34:32 | 22360 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-04
    Description: Neogobius caspius is an endemic species of the Caspian Sea which plays an important role in food chain as a predatory fish. The main aim of this study was to investigate selected feeding characteristics of Neogobius caspius in the south west coasts of the Caspian Sea. Monthly sampling was carried out using a bottom trawler at three stations (Astara, Anzali and Chabuksar) in three depths (0-5, 5-10 and 10-15m) on a monthly basis from October 2004 to September 2005. Relative gut length (RLG) was less than one suggesting that this species is carnivorous. RLG was significantly lower in older fish but gut length was longer (P〈0.05). Intensity of fullness was below the favorite degree (IF〈400) from October to March, however, it was higher (400〈IF〈900) from April to October at all stations, indicating that feeding conditions for this species is suitable in the study area. Study showed that N. caspius mainly fed on molluscs (Food preference, FP=100%), worms (FP=89%) and crustaceans (FP=74%), hence, this species is considered as euryphagus species.
    Description: Article includes abstract in Farsi on last page.
    Keywords: Biology ; Ecology ; Fisheries ; Neogobius caspius ; Feeding characteristics ; Relative gut length ; Food preference ; Caspian Sea ; Gilan Province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 127-140
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  • 2
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    Study of genetic structure of Rutilus frisii kutum in Golestan province coastal waters using microsatellite markers (2021)
    In:  http://aquaticcommons.org/id/eprint/23880 | 18721 | 2018-08-01 07:06:29 | 23880 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: To determine the genetic diversity of Rutilus frisii kutum, 25 samples were collected from Gharesou and Gorgan-rud rivers in April 2008. The genomic DNA was extracted from the caudal fin using phenol- chloroform method and investigated with 10 microsatellite loci. All the 10 investigated loci were polymorphic and showed variability in the two populations of the rivers. The mean number of allele per locus at population level and the observed heterozygosity ranged from 4 to 13 and 0.22 to 1.00, respectively. The FST value between populations was 0.014 (P〈0.05), and the analysis of genetic variation distribution indicated a very high within population variation (99%) while among population variation is low (1%). Highly significant deviation from hardy-Weinberg equilibrium was observed in both populations which can be attributed either to the presence of null alleles or to the genetic bottleneck. The results indicated a high level of genetic variation in this species and we concluded that there is more than one population of Rutilus frisii kutum in Golestan coastal waters.
    Keywords: Biology ; Rutilus frisii kutum ; microsatellite ; Genetic bottleneck ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 151-156
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  • 3
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    Chemical and microbiological changes of salted Caspian kutum (Rutilus frisii kutum) roe (2021)
    In:  http://aquaticcommons.org/id/eprint/22765 | 18721 | 2018-05-21 18:25:04 | 22765 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-09
    Description: Salted kutum roe was prepared by soaking in brine to a traditional procedure. Proximate composition (moisture, protein, lipid, pH, ash and salt content), total volatile basic nitrogen (TVB-N), fatty acid profiles and microbiological characteristics of raw and salted roe of Caspian white fish (Rutilus frisii kutum) were determined. The results indicated that protein and moisture contents were significantly higher in raw roe compared to salted one (28.81 and 61.07% to 23.99 and 51.57%, respectively). Significant differences in ash and salt contents were obtained among different treatments. TVB-N in all samples was less than 25mg/100g. The gas chromatography (GC) analysis showed that the major saturated fatty, monounsaturated fatty acids and poly unsaturated fatty acids were 16:0, 18:1n-9, and 22:6n-3, respectively. Aerobic plate count (APC) and Total Coliform Count (TC) in all samples were significantly higher (p〈0.05) in raw roe (5.33 logCFU/g and 210 MPN/g) compared to salted roe (1.23 log CFU/g and 1.2 MPN/g). None of the samples contained Escherichia coli, Salmonella, Clostridium perfringens or yeast.
    Keywords: Biology ; Chemistry ; Fisheries ; Rutilus frisii kutum ; Roe ; Salting ; Microbial population ; Biology ; Physiology ; Caspian Sea ; Iran ; Chemical ; microbiological
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 176-187
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  • 4
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    Reproductive characteristics of Neogobius caspius from the southwest coasts of the Caspian Sea, Guilan Province of Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/23734 | 18721 | 2018-07-21 17:15:15 | 23734 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Neogobius caspius is an endemic fish species in the Caspian Sea belonging to the family Gobiidae that ecologically play important role as a predator fish in the food chain .The main objective of this research was determination of some reproductive properties of N. caspius in the southwest coasts of the Caspian Sea. Sampling was carried out with a bottom trawler in three stations (Astara, Anzali and Chabuksar) from October 2004 until September 2005. The species was identified based on meristic parameters. The maximum gonadosomatic index (GSI) was recorded at 7.52% for male and 100.12% for female fish in June. A sharp decrease in GSI value from June to the end of September in both sexes was observed and we found that the spawning of the species takes place several times each year. Hence, the species is considered a late spawner. Female to male sex ratio was 1.47:1. Absolute fecundity was in the range 212-1234 eggs and the relative fecundity fluctuated between 18.73 and 29.89 eggs per each gram of the body weight. The correlation between absolute and relative fecundity with age was positive and with total length and full weight was negative. Egg diameter was in the range 0.06 to 0.23mm. The correlation between egg diameter, age and total length was positive.
    Keywords: Biology ; Biological surveys ; Sex ratio ; Males ; Gonadosomatic index ; Fecundity ; Fish physiology ; Reproductive cycle ; Body size ; Reproduction ; Females ; Food chains ; Endemic species ; Brackishwater fish ; Neogobius ; Gobiidae ; Neogobius caspius ; Brackish ; Caspian Sea ; Caspian Sea Eurasia ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 87-98
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  • 5
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    Seasonal variation of chemical composition and fatty acid profile of ovary in wild common carp (Cyprinus carpio) of southeastern Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/23776 | 18721 | 2018-07-27 13:25:54 | 23776 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Chemical composition and fatty acid profile of common carp's gonad (ovary) were assessed. Protein, lipid, fatty acid profile and moisture content were determined during 4 seasons’ summer, autumn, winter in 2007 and spring in 2008. For each season 10 samples were examined. Average of gonadosomatic index in wild common carp was 7.53 ±5.02. Proximate composition of ovary during the study period showed the lipid at 8.06 ±2.20; protein at 23.26 ±4.85; and moisture at 67.12 ±3.85. The results showed lipid content of wild fish ovary increased from summer to spring (summer 6.875 ±0.53; autumn 7.07 ±2.12; winter 7.96 ±1.22; spring 9.44 ±3.62), protein content also increased from summer to spring (summer 12.920.09; autumn 23 ±1.32; winter 25.16 ±0.63; spring 27.11 ±0.63), moisture content decreased in this period (summer 75.235 ±1.75; autumn 68.25 ±2.28; winter 65.685 ±0.40; spring 63.43 ±0.11). Significant differences (P0.05). Saturated and polyunsaturated fatty acids increased from summer to spring (spawning season). The major fatty acids identified in common carp ovary were Oleic (C18:1), palmitic (C16:0), Docosahexanoic acid (C22:6 DHA), Palmitoleic (C16:1), Arachidonic, AA (C20:4), Stearic (C18:0), Eicosapentaenoic acid (C20:5 EPA) and Linoleic (C18:2) in all seasons. Lipid, protein and omega 3 PUFA increased during gonad maturation. It seems that these resources of energy are necessary for embryogenesis.
    Keywords: Biology ; Cyprinus carpio ; Ovary ; Fatty Acid ; Iran ; Caspian Sea ; Caspian Sea Eurasia
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 151-160
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  • 6
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    Population structure of Caspian roach (Rutilus Rutilus caspicus) in southern coasts of Caspian Sea using micro satellite maker (2021)
    In:  http://aquaticcommons.org/id/eprint/26020 | 18721 | 2018-11-22 07:25:13 | 26020 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-24
    Description: Caspian roach is regarded as a valuable bony fish that has economic importance in southern parts of Caspian Sea. Investigations show that natural reproduction of this species has been declining during recent years. Restocking of this fish is achieved by the way of artificial reproduction. Loss of genetic stock of this species is of great concern. In the current study, in order to study the population structure of roach, 54 individuals were captured from Gomishan and Anzali wetlands (27 individuals from each region) in April 2007. Genomic DNA was extracted using phenol-chloroform method and investigated by 10 microsatellite loci. The genetic diversity of two regions [(Gomishan: average number of alleles, Na= 11.4, average effective number of alleles, Ne= 7.92, observed heterozygosity, Ho= 0.69 and expected heterozygosity, He= 0.85) (Anzali: Na= 10.2, Ne= 7.38, Ho= 0.71 and He= 0.84)] were not statistically different (P〉0.05). Analysis of molecular variance showed high genetic diversity (%95) within populations. The Fst value was 0.046, indicating low genetic differentiation among Anzali and Gomishan regions. In this study, 10 of 20 (10 loci × 2 populations) tests showed significant deviation (P≤ 0.005) from Hardy-Weinberg equilibrium due to the heterozygosity deficiency. Results from UPGMA cluster analysis, based on Nei´s genetic distance, showed that the regions are probably separated from each other.
    Keywords: Biology ; Iran ; Caspian Sea ; Rutilus rutilus caspicus ; Caspian Roach ; Microsatellite ; Population ; Structure
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 4-14
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  • 7
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    Study of genetic diversity of Sharpnose mullet Liza saliens (Risso, 1810) in the coastal regions of Mazandaran Province by microsatellite marker (2021)
    In:  http://aquaticcommons.org/id/eprint/24975 | 18721 | 2018-11-19 09:49:57 | 24975 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-16
    Description: Sharpnose mullet is an exotic species of Caspian Sea which was translocated from Black sea to Caspian Sea during 1930 to 1934. This species colonized successfully and now it is commercial species of Caspian Sea. There is no information at molecular level about this species after 8 decades of presence in Caspian Sea, therefore genetic structure of Sharpnose mullet (L. saliens) in two regions, Babolsar and Tonekabonof Mazandaran Province was investigated using 6 microsatellite loci. Results showed low allelic richness (Na=5) and high level of Heterozygosity (Ho=0.821). So genetic diversity of species this was very low relative to marine species. Also, genetic differentiation index between population was very low (0.032) due to natural migration and high gene flow (10.4) between these regions.
    Keywords: Biology ; Iran ; Caspian Sea ; Genetic ; Diversity ; Microsatellite ; Sharpnose mullet ; Liza saliens ; Coastal regions
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 22-33
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