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  • 1
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    Effect of male age in Caspian brown trout, Salmo trutta broodstock on reproductive performance (2018)
    Details
    Publication Date: 2021-05-19
    Description: In this study, three different age groups of male broodstocks (4, 5 and 6 years respectively) were used to fertilize eggs obtained from nine females. The results showed that 6 year old males had maximum body weight (1766 g), total length (56.3 cm) and sperm volume (31.83 ml). Results did not show significant difference in spermatocrit and spermatozoa concentration among age groups (p〉0.05). Our study showed maximum fertilization rate (98.5 %), survival rate until eyes pigmentation (91.17 %), hatching rate (94.5 %) and survival rate until absorption of yolk sack (97.16 %) for 4 years treatment group. Such positive relationships were detected between sperm production characteristics (spermatozoa concentration, spermatocrit and sperm volume) and fertilization parameters. Based on our results, it can be concluded that 4 year old males have high efficiency leading to fertilization success.
    Description: Published
    Keywords: Biology ; Physiology ; Age ; Male ; Artificial insemination ; Salmo trutta
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.328-335
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  • 2
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    Effect of age on reproductive performance in female Caspian brown trout (Salmo trutta caspious, Kessler 1877) (2021)
    In:  http://aquaticcommons.org/id/eprint/21695 | 18721 | 2017-11-27 11:56:25 | 21695 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-28
    Description: Caspian brown trout (Salmo trutta caspius) is one of the economically valuable species in the Caspian Sea.Artificial propagation and production of larvae are the main problems in the early culture of this species.The purpose of this paper is to study the effect of reproductive performance of female broods on opposition reproduction efficiency in Caspian brown trout in the breeding season of 2009. Three groups of female broods (4, 5 and 6 years old) were fertilized with 9 male fish individually. The results showed that,6 year old females have maximum body weight (2150.0 ± 86.6 g), total length (59±2 cm), eggs weight (255.0 ± 30.51 g), egg size (5.37 ± 0.058 mm) and absolute fecundity rate (3060 ± 366.15), while highest average number of ovules in each gram of body weight (16.33 ± 0.58) and relative fecundity (2.08 ± 0.12) belonged to 4 years old females. There were significant differences in mean fertilization rate and survival rate until absorption of yolk sack stage (p〈0.05) among the treatments studied. The present study showed that the eggs produced from fertilization of 6 year old female eggs and male mixed milt showed maximum average fertilization percentage (97.5 %), survival rate until eyed stage (92%), hatching percentage (93%), and survival rate until absorption of yolk sack (94.5%).
    Keywords: Biology ; Fisheries ; age ; reproductive ; performance ; female ; Caspian Sea ; Salmo trutta caspious ; Iran ; larvae ; weight ; male
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 97-103
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  • 3
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    Survey of heavy metal (copper, iron, lead, cadmium, zinc and nickel) concentrations and their effects on the water quality of Anzali wetland (2021)
    In:  http://aquaticcommons.org/id/eprint/21717 | 18721 | 2017-11-28 08:41:08 | 21717 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-29
    Description: Anzali International wetland is one of the most valuable water resources as registered in Ramsar convention with an extent of about 150 km2 in the south Caspian Sea. This wetland, not only has ecological and biological importance for migratory birds and rare fish species, but also is used for farms to discharge into the Caspian Sea through this wetland. Therefore its pollution control is very important for human life. In this study 6 elements (copper, iron, lead, zinc, cadmium and nickel ) in Anzali wetland were analyzed by Atomic Absorption spectroscopy method. . Water samples were collected from ten sampling sites seasonally and the results were compared with each other. The detection limits obtained were 0.016 ng/ml for cadmium, 0.02 ng/ml for copper (Cu), lead (Pb) and zinc (Zn), 0.025 ng/ml for iron (Fe) and 0.026 ng/ml for nickel (Ni). Relative Standard Deviation (RSD) was 1.7%. The results showed that these heavy metals were present in the water. Concentrations of Cu (0.6 mg/l) were higher than international standards reported in some stations. This can be due to industries around the wetland. The average level of heavy metals was higher in spring than in the other seasons which can be due to increase in seasonal rainfall and intensity of flow from rivers to wetland.
    Keywords: Biology ; Chemistry ; Pollution ; heavy metal ; copper ; iron ; lead ; cadmium ; zinc ; nickel ; water quality ; Anzali wetland
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 11-18
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  • 4
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    Effect of male age in Caspian brown trout, Salmo trutta broodstock on reproductive performance (2021)
    In:  http://aquaticcommons.org/id/eprint/22778 | 18721 | 2018-05-21 21:47:48 | 22778 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-10
    Description: In this study, three different age groups of male broodstocks (4, 5 and 6 years respectively) were used to fertilize eggs obtained from nine females. The results showed that 6 year old males had maximum body weight (1766 g), total length (56.3 cm) and sperm volume (31.83 ml). Results did not show significant difference in spermatocrit and spermatozoa concentration among age groups (p〉0.05). Our study showed maximum fertilization rate (98.5 %), survival rate until eyes pigmentation (91.17 %), hatching rate (94.5 %) and survival rate until absorption of yolk sack (97.16 %) for 4 years treatment group. Such positive relationships were detected between sperm production characteristics (spermatozoa concentration, spermatocrit and sperm volume) and fertilization parameters. Based on our results, it can be concluded that 4 year old males have high efficiency leading to fertilization success.
    Keywords: Aquaculture ; Biology ; Fisheries ; Age ; Male ; Artificial insemination ; Salmo trutta ; Biology ; Physiology ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 328-335
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  • 5
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    Effects of water temperature and migration time on some fecundity indices and fertilization rate of female Kutum, Rutilus frisii kutum,migratory to Shiroud River in the southwest Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/21704 | 18721 | 2017-11-27 13:47:35 | 21704 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-28
    Description: Kutum, Rutilus frisii kutum, is an commercially important fish in the Caspian Sea. The fish enters the rivers leading to the Caspian Sea for spawning. One of these rivers is Shiroud River. In the artificial propagation process of Kutum, different factors are involved in quality and quantity of female broods eggs and also in the best temperature and migration time for spawning. The influence of temperature and migration time on some fecundity indices and fertilization rate of female kutum in Shiroud River was studied in the spawning season. In this study, 90 individual females were studied from February to May 2007. Averages of total length, weight and age were 43.26 cm, 832.08 g, and 4.41 respectively. Results showed that maximum egg diameter (1.86 mm), number of eggs per each gram of body weight (309.12), relative fecundity (56.21) and fertilization rate (95.82 %) were obtained from 5 to 20 April (15.95°C). Maximum ovary weight (201.00 g) and absolute fecundity of eggs (49987.18) were obtained from 6 to 20 March (17.74°C). Relationship between temperature and migration time and fecundity indices was linear and weak.
    Keywords: Biology ; Fisheries ; water ; temperature ; time ; fecundity ; fertilization ; female ; Kutum ; Rutilus frisii kutum ; migratory ; Shiroud River ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 9-14
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