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  • Biology  (76)
  • Fisheries  (39)
  • Sturgeon  (15)
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  • 1
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    Economics Analysis of Stock Enhancement of Sturgeon Fingerling in the Caspian Sea (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Several factors cause decline in aquatic stocks. They could be listed as, irregular fishing, damaging aquatic habitats, dam constraction, sand explotation from river bed, oil pullution, industrial, agricultural and domestic pullotion. To overcome such condition, the hatcheries are constracted to produce fingerlings for stock enhancement, new species introduction and biodiversity preservation. This study with economical look, could present a developing policy for increasing the productivity and breeding procedure of sturgeon in Iran, which needs a huge investment. Over the years 2001-2002, to determine the costs of production of a single sturgeon fingerling in Iran, two questionnaires were prepared. An expert trained team comprising of economist, statistician and aquaculturist completed the questionnaire, while reffering all sturgeon centers. For more accuracy, they reffered to documents available in different sections of Shilat, specially, accounting, budgeting and stock enhancement offices. Among various expenditures, cost of labour with 55% and 56% and costs of feed and fertiliser with 14% and 10% have the greatest share, maintenance with 7% and 8% and fertilization eggs with 6% were the important factors. Results shaw, an average cost of production of a single sturgeon fingerling in Iran, was Rls. 992, and Rls. 937 over the 2001-2002. Shahid Rajaee center, had the lowest cost of production of Rls. 477 and Rls. 471 and Shahid Beheshty had the highest cost of production of Rls. 1224 and Rls. 1438 among the all sturgeon breeding centers. The cost of labour had a great share in total expenditures, it could be justify by unactivity of centers during almost 6 months off season, which could be reduced by adopting extra activities such as production of broodstocks, caviar and market-size sturgeon fish in hatcheries.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Fingerlings ; Sturgeon ; Economics ; Stock enhancement ; Several
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 46pp.
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  • 2
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    Application of microsatellite markers to determine populations of the Persian sturgeon (Acipenser persicus) (2018)
    Details
    Publication Date: 2021-05-19
    Description: The objective of this study was to analyse the population genetic structure of the Persian sturgeon (Acipenser persicus) in Sefidrud and Gorganrud rivers watershed based on the characterization of microsatellite markers during 2006 – 2008. 100 samples of Persian sturgeon were collected from two regions. Four microsatellite loci ( Ls 68 , Spl 168 , Spl 173 and Afu 68 ) were analyzed for the molecular characterization of this species which resulted in polymorphic patterns. DNA bands were analysed using Biocapt and GenAlex software package. A total of 109 alleles were observed of which the maximum number of alleles (17) were found in Spl168 locus which belonged to sturgeons from Sefidrud river,s watershed and the minimum number of alleles (10) in Ls68 locus belonging to the sturgeons from Gorganrud river,s watershed. Results of microsatellite analysis revealed that the differences between samples of two regions were not statistically significant (p〉0.05), neither for the average number of alleles per locus nor for observed heterozygosities. The calculated Fst and Rst between two regions was 0.07 and 0.17 showing that the genetic difference was significant (p〈 0.01). Samples from Sefidrud river,s watershed in Spl173, Afu68 and Spl168 loci and samples of other regions in Afu68 and Spl168 loci were at Hardy-Weinberg equation. The genetic distance was calculated as 0.4 which represents a significant genetic difference between samples of two studied areas. I n conclusion, this study suggests that the Persian sturgeons in two regions of the southern part of the Caspian Sea are genetically differentiated, therefore fisheries management of these unique stocks for restocking and conservation of gene pools is highly recommended.
    Description: Published
    Keywords: Persian sturgeon ; Acipenser persicus ; Caspian Sea ; Microsatellite ; Genetic structure ; Population genetic ; Fisheries
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.596-606
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  • 3
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    A preliminary study on phylogenetic relationship between five sturgeon species in the Iranian Coastline of the Caspian Sea (2018)
    Details
    Publication Date: 2021-05-19
    Description: The phylogenetic relationship of five sturgeon species in the South Caspian Sea was investigated using mtDNA molecule. Sequence analysis of mtDNA D-loop region of five sturgeon species [Great sturgeon (Huso huso), Russian sturgeon (Acipenser gueldenstaedtii), Persian sturgeon (Acipenser persicus), Ship sturgeon (Acipenser nudiventris), Stellate sturgeon (Acipenser stellatus)] and DNA sequencing of two Escherichia coli cloned DNA fragments sized 758 bp and 922 bp was carried out. Sequence comparison of the mtDNA D-loop region between the five sturgeon species showed 100 % sequence identity. However comparison between a short (758 bp) and long (922bp) mtDNA D-loop region within Russian sturgeon showed a 5 bp differences. On the contrary a partial sequence of the mtDNA ND5 gene region showed high sequence and organic base variability in the five species. These results indicate that direct sequencing of ND5 gene provide more information for phylogenetic or population level studies in sturgeon species. The present study revealed a distinct classification among the five sturgeon species. On the basis of the phylogeny tree it is clear that a close evolutionary relationship exists between the great sturgeon and ship sturgeon that was verified in five phylogenetic trees. On the other hand a close resemblance was also seen between Persian and Russian sturgeon indicates that these two species have a closer evolutionary relationship. This study also showed a 2.2 % sequence divergence in sequence data for ND5 gene between Persian sturgeon and Russian sturgeon which indicated that these two species diverged from each other approximately one million years ago. However the verification of this calls for DNA sequencing of different genes.
    Description: Published
    Keywords: Acipenser nudiventris ; Acipenser stellatus ; Acipenser persicus ; Acipenser gueldenstaedtii ; Huso huso ; Sturgeon ; Phylogenetic ; PCR ; Species
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-12
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  • 4
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    Effects of feeding frequency on growth in hatchery reared beluga sturgeon (Huso huso) (2018)
    Details
    Publication Date: 2021-05-19
    Description: The effects of feeding frequency on growth rate, food conversion ratio (FCR) and survival in juvenile beluga sturgeon were studied through two phases of rearing. 360 beluga fingerlings with an average weight of 20.51 ±0.33g were reared through a period of 60 days in the first phase and about 180 fingerlings with an average weight of 77.55±1.18g were reared through a period of 95 days in the second phase in fiberglass tanks (500 L) with a water flow rate of 0.2 L/sec under similar conditions of rearing (dissolved oxygen, light, water velocity, etc.). Three different feeding frequencies were used for each phase (3, 5 and 8 times feeding per day) with three replicates. It was evident from the results obtained from the first experimental phase that with an increase in feeding frequency there was an increase in growth rate, weight increase percentage and specific growth rate as well as a decrease in FCR value. However no significant differences were observed in the three group,) studied (P 〉0.05). Whereas in the second phase of study significant differences (P〈0.05) were observed in the parameters studied (length, weight and FCR) in the third study group (with 8 times feeding per day) at the end of study period. We may therefore conclude that growth rate, nutritional uptake and social behavior of each fish species are dependent on its feeding frequency.
    Description: Published
    Keywords: Experimental ; Nutritional ; Huso huso ; Feeding times ; Feeding frequency ; Beluga ; Sturgeon ; Food conversion ratio ; Growth ; Fingerlings ; Dissolved oxygen ; Water velocity
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.145-158
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  • 5
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    Population structure of Acipenser nudiventris in the south coast of Caspian Sea and Ural River using Microsatellite method (2018)
    Details
    Publication Date: 2021-05-19
    Description: Population structure of Ship sturgeon, Acipenser nudiventris, from the south coast of Caspian Sea and Ural River was investigated using Microsatellite method. For this reason, 73 specimens of the sturgeon were collected from five locations in two sampling regions the first consisted of Bandar Anzali, SefidRud River, Babolsar, and Gorgan, and the second was Ural River. Four SSR markers were used in this investigation, of which 5 loci produced DNA band, with three of them being polymorph. One primer showed two loci with one of them being polymorph and another was monomorphic). Average expected and observed heterozygosity was 0.86 and 0.75 respectively. Genetic variation was assessed through analysis of molecular variance (AMOVA) that indicated almost all of the variance in data namely %94 (P less than or equal to 0.03) was within locations.
    Description: Published
    Keywords: Rivers ; Anadromous species ; Nucleotide sequence ; Induced breeding ; Primers ; Ships ; Sampling ; Coasts ; Acipenser ; Acipenser nudiventris ; Brackish ; Population Genetics ; DNA ; Genetic diversity ; Population structure ; Genotypes ; Biopolymorphism ; Aquaculture techniques ; Fish ; Sturgeon ; Populations ; Sexual Reproduction
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.99-108
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  • 6
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    An investigation on the number of micropyle contained in the ovum of Sturgeon in the south coast of Caspian Sea (2018)
    Details
    Publication Date: 2021-05-19
    Description: Determination of the number of ovum micropyle in three sturgeon species had been the main goal of this research. The study was conducted on 44 specimens of female Persian sturgeon (Acipenser Persicus), 13 specimens of female Stellate sturgeon (A.stellatus) and 8 specimens of female beluga (Huso huso). 50 ova were randomly collected and evaluated from each specimen and totally the micropyles of 3250 ova from three sturgeon species were studied. From the 44 specimens of Persian sturgeon, 13 belonging to the South-East area of Caspian Sea; Golestan province, Shahid Marjani center and 31 of them from the South-West area of Caspian Sea; Guilan province, Shahid Beheshti center; including 21 specimens from the sea and 10 ones from Sefid-rud River. The entire stellate sturgeon specimens and beluga specimens were collected from Guilan province and Golestan province respectively. Based on achieved from results, the average number of micropyls of Persian sturgeon, inhabitant of the eastern part of Caspian sea, was 7.7±1.59 for the western part was 8.7±1.75 and for Persian sturgeon catched from Sefid-rud was 8.3 ± 1.6 in each ovum. Based on evaluation and statistic comparison, no significant difference (P〉0.95) was observed between Persian sturgeon of the East and West part, in terms of micropyle number. The average number of micropyle of stellate sturgeon was 4.7±1.51 and for beluga was 5.19±1.59 in each ovum. The average diameters of outer membrane micropyle of ovum in A.Persicus, A.Stellaus and Huso huso were 21.97±1.05 micron, 21.5±1.2 micron and 22.1±0.7 micron respectively; and the average diameters of inner membrane micropyle of ovum were 18.82±1.1 micron, 17.4±1.6 micron and 18.6±1.7 micron respectively.
    Description: Published
    Keywords: Micropyle ; Ovum ; Sturgeon ; Species ; Specimens ; Acipenser Persicus ; A.stellatus ; beluga ; Huso huso ; Beluga ; A.Persicus
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp.35-48
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  • 7
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    Stock Assessment and Coservation of Sturgeon Stocks of the Caspian Sea (2018)
    Details
    Publication Date: 2021-05-19
    Description: The sturgeon stocks of the Caspian Sea have been dramatically diminished due to the human activities, which have affected their natural habitat. This report discusses the causes of this problem supported by different physiological, biological and ecological studies as well as stock assessment analyses, mostly carried out in the northern part of the Caspian Sea. The major part of the data in this review have been obtained from a paper presented by A.D. Vlasenko at the International Conference on Sturgeon Biodiversity and Conservation, New York (July 28 - 30, 1994).
    Description: Published
    Keywords: Sturgeon ; Report ; Physiological ; Biological ; Ecological ; Biodiversity ; Conservation ; Stock
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.13-22
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  • 8
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    Isolation and molecular diagnosis of lactic acid bacteria in intestine of Siberian sturgeon (Acipenser baerii) (2019)
    Details
    Publication Date: 2021-05-19
    Description: Caspian Sea sturgeons, are the most valuable species due to the production of meat and caviar. Sturgeon cultures as like other fish rearing, the outbreak of all kinds of infectious diseases in the farms can be expected and in this regard, isolation, identification and consumption of the local probiotics can be very important in the health promotion and growth indices. For this purpose, sampling has been done from 38 fish, in addition to culturing and counting aerobic and facultative anaerobic bacteria (AFAB) on Triptic Soy Agar, and lactic acid bacteria (LAB) were also isolated and counted on MRS Agar. In Siberian sturgeon, the average number of LAB were 2.72±0.11 (Log CFU g-1 ) and the average of AFAB were 6.79±0.19 (Log CFU g-1 ). Through 16SrRNA gene sequencing, LAB including Weissella confusa, Lactococcus lactis, and L. garvieae were molecular identified in the Siberian sturgeon intestines. Complete laboratory and field studies for use of these bacteria as probiotics is required.
    Description: Published
    Keywords: Acipenser baerii ; Siberian sturgeon ; Weissella confusa ; Lactococcus lactis ; L. garvieae ; Food ; Intestine ; Aquatic animals ; Sturgeon ; Probiotic
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.19-28
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  • 9
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    Study on probable natural reproduction in Sturgeon of the south Caspian Sea in the Sefidrud River (2018)
    Details
    Publication Date: 2021-05-19
    Description: Sturgeon are considered one of the most valuable fishes of the world that migrate to the rivers leading to the Caspian Sea, including the Sefirud River, to spawn. In the post this river was known as the reservoir for millions of sturgeon larvae, but at present due to illegal fishing in the river and the construction of the Tarik Dam, Manjil Dam and the Sangar Dam in the migratory route of these fishes and so also the decrease in the water flow of this river, it is losing its popularity. In order to study the natural reproduction of sturgeon in the river, an attempt to find larvae of different species of sturgeon was made from 19 May, 1996 to 13 June 1996. Six sampling stations were located from the beginning of the Sangar Dam as far as the sea shore (about 40 Km) for this purpose. Different methods of catch were employed including beach seine nets (mesh size 1, 4 and 8mm). “CALO” a local fishing effort (mesh size 4mm) and conical nets (mesh size 1 and 4 mm). On the whole out of 268 times that nets were cast, 1853200 Km of the study area was survey and totally 514500 fishes belonging to the fallowing species were caught. Liza auratus, Chalcalburnus chalcoides, Varicorhinus capoeta, Cobitis sp., Esox lucius, Silurus glanis, Abramis baranta, Carassius auratus, Cyprinus carpio, Tinca tinca, Stizostedion lucioperca , Alosa caspia , Syngnathus nigrolineatus, Barbus sp. , Anthemia boyeri, Pungitius platygaster and Gobius sp. No larvae of sturgeons were observed during this study. Although 218 brood fishes were caught in the Sefirud River in 1996, due to fishing pressure, illegal fishing, deterioration of spawning grounds and restrictions in the migratory route resulting from the construction of dams, no signs of natural reproduction were observed in the Sefirud River. Therefore it can be concluded that even if natural reproduction did take place in the Sefidrud River, the incidences were very low.
    Description: Published
    Keywords: Sturgeon ; Larvae ; Species ; Conical nets ; Survey ; Liza auratus ; Chalcalburnus chalcoides ; Varicorhinus capoeta ; Cobitis sp . ; Esox lucius ; Silurus glanis ; Abramis baranta ; Carassius auratus ; Cyprinus carpio ; Tinca tinca ; Stizostedion lucioperca ; Alosa caspia ; Syngnathus nigrolineatus ; Barbus sp. ; Anthemia boyeri ; Pungitius platygaster ; Gobius sp. ; Spawning ; Migratory
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.69-82
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  • 10
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    Sperm fertilization capacity of Caspian salmon, Salmo trutta caspius under ultraviolet irradiation (2021)
    In:  http://aquaticcommons.org/id/eprint/21728 | 18721 | 2017-11-28 08:45:40 | 21728 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-29
    Description: The optimum dose of ultraviolet (UV) irradiation to produce gynogenetic Caspian salmon, Salmo trutta caspius, with emphasis on the "Hertwig effect" and photoreactivation (PR) were investigated. The sperm of Caspian salmon was irradiated with UV at 2010 ± 200 µw.cm-2 in different times including 0, 1, 3, 5, 8, 10, 15, 20, 25, 35 and 45 min and was allowed to fertilize normal ova; the fertilization, eyed and hatching rates were calculated to assess the performance. Using the irradiated sperm decreased the fertilization, eyed as well as hatching rates and the so-called "Hertwig effect" was observed, with the time-dependent decrease in the hatching rates at 0+ to 3 min irradiation, but better hatching rates were observed at more prolonged irradiation times. The best hatching rate was achieved at 25 min of UV irradiation; after that the survival rates rapidly declined to near zero. For PR studies, the semen was irradiated with UV (5, 30 and 120s) and untreated semen (0s) was used as control. Irradiated semen and/or fertilized eggs by treated semen were exposed to visible light (60 W) at a distance of 30 cm for 10 min; the eyed and hatching rates were measured. UV irradiation as low dose as 5s, significantly decreased the hatching rate (P 〈0.05). Semen and/or eggs illumination with visible light could not improve the survival rates (P 〉0.05). So, based on the results of this study, it was impossible to detect any PR mechanism in Caspian salmon.
    Keywords: Aquaculture ; Biology ; Salmo trutta caspius ; sperm ; fertilization ; capacity ; Caspian salmon ; ultraviolet ; irradiation ; Caspian sea ; iran ; photoreactivation ; gynogenetic
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-13
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