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  • Oncorhynchus mykiss  (5)
  • Mixed milt fertilization  (3)
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  • 1
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    Mixed milt fertilization of endangered Caspian brown trout Salmo trutta caspius influences effective population size of breeders (2018)
    Details
    Publication Date: 2021-05-19
    Description: The maintenance of the endangered Caspian brown trout Salmo trutta caspius populations in Iran depends on its artificial breeding. There is no information on how current hatchery breeding protocol influences effective population size of breeders (Ne), which is a critical parameter to maintain genetic diversity in future generations. The current hatchery protocol (CHP) was comparatively evaluated with a balanced hatchery protocol (BHP), where mixtures of equal amounts of gametes per male and female breeder were used to balance parental contributions to progeny. To evaluate putative differences in viability between families, individual crosses were performed and fertilized ova of different families were mixed to constitute balanced family pools. 1440 alevins were totally sampled in the crosses performed from the 11 breeders. An exclusion-based parentage approach using three polymorphic microsatellite markers unambiguously assigned more than 93% of progeny to a single pair of parents. Significantly different contributions of breeders to progeny were observed in CHP (p〈0.05). The primary constraint on Ne in BHP was the unbalanced contribution of males, which seemed a consequence of sperm competition in mixed fertilization caused by differences in sperm quality. Sperm motility duration was positively correlated with the number of sired progeny by each male. The results illustrate the limitations of the BHP in minimizing the loss of genetic diversity observed in CHP. A protocol based on mixture of equal number of fertilized ova from individual male × female crosses emerged as the best alternative for conservation of Caspian brown trout.
    Description: Published
    Keywords: Aquaculture ; Caspian brown trout ; Salmo trutta caspius ; Mixed milt fertilization ; Effective population size ; Sperm competition ; Microsatellite ; Population ; Size
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.393-408
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  • 2
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    Production of all-female Rainbow Trout (Oncorhynchus mykiss) using sex-reversed males and investigation of their growth parameters in the first year of culture (2018)
    Details
    Publication Date: 2021-05-19
    Description: Possibility of producing all-female rainbow trout (Oncorhynchus mykiss) using neomale stock were investigated in Kelardasht hatchery. To do this, we compared the fertilization, hatching rate and growth parameters of progeny in the first year of culture. Histological studies of gonads showed that progenies produced by mating sex-reversed males and normal females were totally female. Eyed-stage egg, hatching and early survival rate in all--female population were 90:69 %, 97.36 %, 91.49 % and in mix sex population were 7024 %, 98.22 %, 90.73 %, respectively, showing no significant differences (P〉0.05). Lack of maturation in the first year cultured fish led to the identical growth parameters in mix sex and all-female groups (P〉0.05). Results showed that use of sex-reversed males can be one of the best and successful methods of producing all-female populations.
    Description: Published
    Keywords: Rainbow trout ; Oncorhynchus mykiss ; Fish ; Sex-reversed ; Female ; Hatching ; Eggs ; Growth
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.45-54
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  • 3
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    Investigating the correlation between sperm quality parameters and the amount of contribution by Caspian brown trout male breeders to F1 progeny in mixed milt fertilization (2021)
    In:  http://aquaticcommons.org/id/eprint/26092 | 18721 | 2018-11-17 18:34:21 | 26092 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-24
    Description: Artificial breeding and subsequent release of the Caspian brown trout juveniles (Salmo trutta caspius Kessler, from Salmonidae) has been adopted by Iranian Fisheries Organization as a result of fishing pressure on its stocks. Unbalanced contribution of male breeders to F1progeny is expected with present mixed milt fertilization of gametes. Non-parametric Spearman's correlation coefficient was used to investigate the relationship between some sperm quality parameters and the contribution of Caspian brown trout male breeders at three trials. In the first trial, fertilization was performed using ova and sperm of four male and fourfemale breeders according to routine hatchery protocol. In the second and third trials, ova and sperm of respectively four and two female and four and six male breeders with equal number of ova and the same volume of milt were fertilized. Parentage assignment of yolk sacabsorbed F1 alevins was performed in FAP program using three polymorphic microsatellite loci (Str58, Str73 and Str591). More than 94% of mixed milt produced progeny were assigned to their parents in trials. Sperm motility duration was positively correlated with the number of sired progeny by each male in trials. The correlation was negative between sperm concentration and spermatocrit with amount of contribution by male breeders to F1 progeny. The results reveal the effect of sperm motility duration on the ability of alevin production by Caspian brown trout male breeders at sperm competition condition in mixed milt fertilization of gametes.
    Keywords: Agriculture ; Parentage assignment ; Artificial breeding ; Mixed milt fertilization ; Sperm motility ; Caspian brown trout
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 50-60
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  • 4
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    Optimization of UV irradiation for production of gynogenetic rainbow trout, Oncorhynchus mykiss: emphasising Hertwig effect and photoreactivation (2021)
    In:  http://aquaticcommons.org/id/eprint/22287 | 18721 | 2018-03-13 02:18:42 | 22287 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-02
    Description: The optimum dose of UV irradiation to produce gynogenesis rainbow trout, Oncorhynchus mykiss with emphasis of Hertwig effect and photoreactivation (PR) was investigated. For this purpose, the sperm of rainbow trout were irradiated with UV at 2010±200 µw.cm-2intensity in different alternatives of 0, 1, 3, 5, 8, 10, 15, 20, 25, 35 and 45 minutes and allowed to fertilize normal ova; the fertilization, eyed and hatching rate 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 hatching rate at 0+to 10 min of irradiation, but a better hatching rate at greater time of irradiation was observed. The highest hatching rate was observed in 20 min of UV irradiation; after that the survival rate decreased rapidly. Interestingly, irradiation even up to 45 min could not eradicate sperm fertility and a hatching rate above zero was observed at this treatment. For PR studies the semen was irradiated with UV for 5, 30 and 120 seconds and untreated semen (Os) 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. The results showed that UV irradiation in as low as 5s could cause deleterious effect on semen chromatin and decrease the eyed and hatching rates (p〈0.05). Illumination of semen and\or eggs with visible light resulted in PR in rainbow trout when sperm was irradiated by UV at 120s. We could conclude that the best UV irradiation time for production of gynogenesis rainbow trout was 20 min and UV irradiation, fertilization and egg hardening must be done far from visible light to eliminate the PR mechanism.
    Keywords: Biology ; Fisheries ; Gynogenesis ; Hertwig effect ; Oncorhynchus mykiss ; Photoreactivation ; Rainbow trout ; Ultraviolet ; Iran irraciation
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 19-34
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  • 5
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    Mixed milt fertilization of endangered Caspian brown trout Salmo trutta caspius influences effective population size of breeders (2021)
    In:  http://aquaticcommons.org/id/eprint/22784 | 18721 | 2018-05-22 17:50:27 | 22784 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-10
    Description: The maintenance of the endangered Caspian brown trout Salmo trutta caspius populations in Iran depends on its artificial breeding. There is no information on how current hatchery breeding protocol influences effective population size of breeders (Ne), which is a critical parameter to maintain genetic diversity in future generations. The current hatchery protocol (CHP) was comparatively evaluated with a balanced hatchery protocol (BHP), where mixtures of equal amounts of gametes per male and female breeder were used to balance parental contributions to progeny. To evaluate putative differences in viability between families, individual crosses were performed and fertilized ova of different families were mixed to constitute balanced family pools. 1440 alevins were totally sampled in the crosses performed from the 11 breeders. An exclusion-based parentage approach using three polymorphic microsatellite markers unambiguously assigned more than 93% of progeny to a single pair of parents. Significantly different contributions of breeders to progeny were observed in CHP (p〈0.05). The primary constraint on Ne in BHP was the unbalanced contribution of males, which seemed a consequence of sperm competition in mixed fertilization caused by differences in sperm quality. Sperm motility duration was positively correlated with the number of sired progeny by each male. The results illustrate the limitations of the BHP in minimizing the loss of genetic diversity observed in CHP. A protocol based on mixture of equal number of fertilized ova from individual male × female crosses emerged as the best alternative for conservation of Caspian brown trout.
    Keywords: Aquaculture ; Biology ; Conservation ; Fisheries ; Caspian brown trout ; Salmo trutta caspius ; Mixed milt fertilization ; Effective population size ; Sperm competition ; Microsatellite ; aquaculture ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 393-408
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  • 6
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    Investigation on the effects of age and time of stripping on spermatocrit and duration of sperm motility in Oncorhynchus mykiss (2021)
    In:  http://aquaticcommons.org/id/eprint/23719 | 18721 | 2018-07-20 09:29:32 | 23719 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: The effects of three male age groups (2, 3 and 4 years old) and spawning season on total duration of sperm motility and spermatocrit in November, December, January and February were studied. We found the highest amount of spermatocrit in 2 ^(+) year males, in November (31.50 ±1.61) and the lowest amount of spermatocrit in the same age group was in February (25.11 ±0.9). The highest amount of spermatocrit in 3 years old fishes was spotted in November (21.42 ± 0.7), but at this age, there were no significant difference between the level of spermatocrit in January and February. In 4 years old fishes, the highest spermatocrit value was seen in November (25.11 ±0.77) and the lowest spermatocrit was in February (18.20 ±0.20), but again with no significant difference between the amount of spermatocrit in January and February. In 2 years males, the highest duration of sperm motility was in January (27.7 ± 1) and February (24.3 ±1.6), but there were no significant differences between January and February. In 3 years males, the longest duration of sperm motility was seen in January (29.9 ±1.1) which was highest and significantly different with other age groups. In 4 years old males, January was the month with the longest duration of sperm motility (29.42 ±0.4), which was also significantly different with other age groups. Duration of sperm motility in all male age groups was lowest in November, and we found it to be 24.86 ±0.9 at 2 ^ (+) years old males, 26.40 ±0.4) at 3 ^ (+) years old males and 26 ±0.32 at 4 ^ (+) years old males. The correlation between the amount of spermatocrit and duration of sperm motility in spawning season was negative and significant (r=0.642).
    Keywords: Biology ; Spawning seasons ; Age ; Motion ; Sperm ; Oncorhynchus mykiss ; Mazandaran Province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 103-112
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  • 7
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    Production of all-female rainbow trout (Oncorhynchus mykiss) using sex-reversed males and investigation of their growth parameters in the first year of culture (2021)
    In:  http://aquaticcommons.org/id/eprint/24725 | 18721 | 2018-08-04 16:27:25 | 24725 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Possibility of producing all-female rainbow trout (Oncorhynchus mykiss) using neomale stock were investigated in Kelardasht hatchery. To do this, we compared the fertilization, hatching rate and growth parameters of progeny in the first year of culture. Histological studies of gonads showed that progenies produced by mating sex-reversed males and normal females were totally female. Eyed-stage egg, hatching and early survival rate in all of female population were 90:69 %, 97.36 %, 91.49 % and in mix sex population were 7024 %, 98.22 %, 90.73 %, respectively, showing no significant differences (P〉0.05). Lack of maturation in the first year cultured fish led to the identical growth parameters in mix sex and all-female groups (P〉0.05). Results showed that use of sex-reversed males can be one of the best and successful methods of producing all-female populations.
    Keywords: Aquaculture ; Biology ; Oncorhynchus mykiss ; Sex-reversed ; Kelardasht ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 45-54
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  • 8
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    Investigation on the effects of age and time of stripping on spermatocrit and duration of sperm motility in Oncorhynchus mykiss (2018)
    Details
    Publication Date: 2021-05-19
    Description: The effects of three male age groups (2, 3 and 4 years old) and spawning season on total duration of sperm motility and spermatocrit in November, December, January and February were studied. We found the highest amount of spermatocrit in 2 super(+) year males, in November (31.50 plus or minus 1.61) and the lowest amount of spermatocrit in the same age group was in February (25.11 plus or minus 0.9). The highest amount of spermatocrit in 3 years old fishes was spotted in November (21.42 plus or minus 0.7), but at this age, there were no significant difference between the level of spermatocrit in January and February. In 4 years old fishes, the highest spermatocrit value was seen in November (25.11 plus or minus 0.77) and the lowest spermatocrit was in February (18.20 plus or minus 0.20), but again with no significant difference between the amount of spermatocrit in January and February. In 2 years males, the highest duration of sperm motility was in January (27.7 plus or minus 1) and February (24.3 plus or minus 1.6), but there were no significant differences between January and February. In 3 years males, the longest duration of sperm motility was seen in January (29.9 plus or minus 1.1) which was highest and significantly different with other age groups. In 4 years old males, January was the month with the longest duration of sperm motility (29.42 plus or minus 0.4), which was also significantly different with other age groups. Duration of sperm motility in all male age groups was lowest in November, and we found it to be 24.86 plus or minus 0.9 at 2 super(+) years old males, 26.40 plus or minus 0.4) at 3 super(+) years old males and 26 plus or minus 0.32 at 4 super(+) years old males. The correlation between the amount of spermatocrit and duration of sperm motility in spawning season was negative and significant (r=0.642).
    Description: Published
    Keywords: Oncorhynchus mykiss ; Spawning seasons ; Age ; Motion ; Sperm
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.103-112
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