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  • 1
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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
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    Format: 97-103
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  • 2
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    Spermatological parameters of wild and cultured beluga (Huso huso Linnaeus, 1758) and their effects on fertilization rate, hatching rate, larval growth and survival rates (2021)
    In:  http://aquaticcommons.org/id/eprint/21779 | 18721 | 2017-12-03 14:56:39 | 21779 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-07-01
    Description: To compare the reproductive performance of the wild and cultured stocks of beluga, Huso huso males, some spermatological parameters were measured including: sperm motility, sperm density, spermatocrit and also fertilization rate, hatching rate and larval growth and survival rates. The semen samples were sampled from 11 wild spawners and 12 cultured brooders. A half of each semen sample was allocated for spermatological analysis and remaining were used for artificial propagation. In wild beluga, sperm motility time was 339.09 ± 23.11 s; spermatozoa motility rate 83.64 ± 2.01%; sperm density 15.22 ± 3.46 ×109 and spermatocrit 5.88 ± 1.36% while in cultured beluga, sperm motility time was 199.35 ± 29.02 s; spermatozoa motility rate 74.22 ± 2.4 %; sperm density 8.37 ± 0.24 × 109 and spermatocrit 3.21 ± 0.29 %. The fertilization rate (%), hatching rate (%), larval growth (% g.day-1), and survival rate (%) in wild beluga were 61.72 ± 14.16, 43.33 ± 11.13, 12.28 ± 0.33 and 52.66 ± 7.77, while in cultured beluga were 49.98 ± 6.55, 31.47 ± 8.49, 12.28 ± 0.62 and 57.37 ± 7.89, respectively. The spermatozoa motility (the ratio and duration of motility) were significantly different between wild and cultured brooders (P〈0.05). The values of sperm density, spermatocrit, fertilization rate, hatching rate, larval growth and survival rate were not significantly different between wild and cultured beluga (P〉 0.05).
    Keywords: Aquaculture ; Biology ; Fisheries ; Sperm density ; Sperm motility ; Growth rate ; Survival rate ; Beluga ; Huso huso ; parameters ; fertilization ; Iran
    Repository Name: AquaDocs
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    Format: 273-279
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  • 3
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    Changes of biochemical, sex steroids and carcass composition of stellate sturgeon (Acipenser stellatus) juveniles fed different dietary levels of 17-ß estradiol (2021)
    In:  http://aquaticcommons.org/id/eprint/22039 | 18721 | 2018-01-25 08:15:09 | 22039 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-06
    Description: This study was carried out to find the effects of 17-ß estradiol (E2) on biochemical parameters, sex steroids and carcass composition in juvenile stellate sturgeon (Acipenser stellatus). One hundred and eighty 5-month stellate sturgeon with an average weight of 11.7 ± 0.2 g were divided into 3 treatments with 3 replicates each with 20 fish per tank. The treatments were included 0, 25 and 50 mg E2/kg diet. At the termination of 7 months feeding trial with different levels of E2, blood biochemical parameters, sex steroids and carcass composition were measured. The results of biochemical parameters including plasma glucose, total protein, cholesterol, triglyceride, calcium and phosphorus showed dose-dependent manner. The lowest and highest levels of all biochemical parameters were observed in fish fed control and 50 mg E2/kg diet, respectively (p〈 0.05). Plasma sex steroids concentrations showed the lowest level of E2 in fish fed control diet, while the highest levels of testosterone and progesterone were observed in this treatment (p〈 0.05). Proximate carcass analysis showed no significant difference in moisture, crude protein, crude fat and ash contents among the treatments (p〉 〉0.05). Final weight, total length, hepatosomatic and viscerosomatic indices were also affected by different levels of E2 (p〈 0.05). The results of present study demonstrated that using E2 in the diet of juvenile stellate sturgeon can influence most of biochemical indices and sex steroids which seems that those were related to the changes of sex ratio and some physiological parameters.
    Keywords: Aquaculture ; Biology ; Chemistry ; Stellate sturgeon ; Sex steroids ; Biochemistry ; Growth ; sex ; composition ; Acipenser stellatus ; juveniles ; fed ; dietary ; levels ; 17-ß estradiol ; Iran
    Repository Name: AquaDocs
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    Format: 59-74
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  • 4
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    Effective factors on adoption technology among trout fish farms in Guilan Province (2021)
    In:  http://aquaticcommons.org/id/eprint/22071 | 18721 | 2018-02-01 09:13:33 | 22071 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-07
    Description: The main purpose of this study was to investigate effective factors on adopting technologies among trout fish farmers in Guilan province by Unified Theory of Acceptance and Use of Technology (UTAUT). Statistical population of this research contained of all managers of trout fish farms of Guilan province (N=170) that base on limitation of structural equation modelling in determining sample size, 97 of them were chosen as a sample. Study tool was contained Vankatesh and et al. information technology questionnaire in six items. To obtain validity of questionnaire; content, face, convergent and discriminant validity were used. As well, to obtain reliability of questionnaire; principal component analysis, Cronbachs alpha, Dillon-Goldstein’s ʃ and reagent stability were used. To accomplish analysis of data, SPSSV19 and SmartPLSV2 software were used in descriptive and inferential statistics. For testing hypothesis, structural equation model (SEM) and partial least squares (PLS) that focus on reagent variance were used. The results showed that there was significant relationship between performance expectancy and behavioral intention. Also there was significant relationship between intention to use and use behavior of aquaculture technologies. Model explains 28.8 percent of behavioral intention variance and 7.9 percent of use behavior of aquaculture technologies variance among trout fish farmers. To increase willingness to accept the technology among trout fish farms in Guilan province, it is suggested that extension-education courses for raising knowledge and awareness of aquaculture technology to be held by organizations. Providing financial resources and adequate knowledge will enable trout fish farms to equip with the aquaculture technologies.
    Keywords: Aquaculture ; Technology ; Technology Acceptance ; UTAUT Model ; Fish Farms ; Guilan Province ; Iran
    Repository Name: AquaDocs
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    Format: 107-124
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  • 5
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    The effects of different dietary vitamin C and iron levels on the growth, hematological and immunological parameters of rainbow trout Oncorhynchus mykiss fingerlings (2021)
    In:  http://aquaticcommons.org/id/eprint/22920 | 18721 | 2018-06-06 01:52:16 | 22920 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-11
    Description: A 60-days growth trial was conducted in a flow-through culture system to examine the effects of different dietary vitamin C and iron levels on the growth, hematological and immunological parameters of rainbow trout (Oncorhynchus mykiss) fingerlings (with average initial weight of 5.12 ± 0.02 g). Three levels of vitamin C (150, 200 and 250 mg kg^-1 diet) and iron (5, 7 and 9 mg kg^-1 diet) (as ferrous sulfate) and their combination were used to prepare diets used in nine experimental treatments with three replicates. The results revealed that the supplementation of basal diet with vitamin C and iron significantly affected the final body weight (FBW), total length (TL), feed conversion ratio (FCR) and specific growth rate (SGR). Among the haematological parameters haematocrit and mean corpuscular volume (MCV) were significantly influenced by vitamin C and iron. Results also showed that lysozyme and IgM concentrations significantly changed among dietary treatments. Based on the results of this study, it can be concluded that addition of vitamin C and iron to the basal diet of cultured rainbow trout will improve the growth rate and well-being of this fish.
    Keywords: Aquaculture ; Biology ; Fisheries ; Growth performance ; Hematological and Immunological Parameters ; Vitamin C ; Iron ; Rainbow trout ; Biology ; Physiology ; Iran
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    Format: 886-897
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  • 6
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    Effect of age on reproductive efficiency of adult rainbow trout, Oncorhynchus mykiss Walbaum, 1972 (2021)
    In:  http://aquaticcommons.org/id/eprint/22924 | 18721 | 2018-06-06 02:08:16 | 22924 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-11
    Description: Rainbow trout, Oncorhynchus mykiss is one of the most important cold water fishes in Iran. For successful artificial propagation of rainbow trout, the quality and quantity of brooders and sexual materials are key factors. In the present study, we investigated the age-dependent changes of reproductive efficiency. For this purpose, the brooders were divided into age classes and then three age groups of male and female (i.e. 3, 4 and 5 years old) selected randomly from each age class. At the time of propagation, total length and weight of brooders before and after stripping, egg diameter, total weight of stripped eggs and sperm quality parameters including sperm density and spermatocrit were measured. Afterward, the brooders were crossed randomly. According to our results, the higher percentage of fertilization (98%), hatching (96%), survival (94.5%) and also the larvae with more active feeding (n= 3070) were found when the 4 year old males were crossed with 5 year old females (p〈0.05). Our results confirmed the age-dependent changes of reproductive efficiency in rainbow trout. We conclude that the cross between 4 year old males and 5 year old females of rainbow trout can enhance the reproductive efficiency.
    Keywords: Aquaculture ; Biology ; Fisheries ; Survival ; Fertility rate ; Fertilization ; Rainbow trout ; aquaculture ; Iran
    Repository Name: AquaDocs
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    Format: 945-956
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  • 7
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    Food preference and growth of grass carp, Ctenopharyngodon idella (Cuvier and Valenciennes, 1844) fed some aquatic and terrestrial plants (2021)
    In:  http://aquaticcommons.org/id/eprint/23160 | 18721 | 2018-06-18 23:11:47 | 23160 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-13
    Description: The present study was carried out to examine 6 plants including aquatic and terrestrial plants on food preference and growth of grass carp. 7 experimental treatments with three replicates were considered. The experimental treatments were ponds containing T1: M. spicatum, T2: C. demersum, T3: A. filiculoides, T4: L. minor, T5: C. dactylon, T6: M. sativa and T7: M. Spicatum + C. demersum + A. filiculoides + L. minor + C. dactylon + M. sativa. 12 grass carps (20 g) were added to each experimental pond. After 5 months, the fish body composition was assessed. According to results, the higher values of fish weight gain rate were obtained in treatments T4 (3.13 g), T6 (2.93 g) and T1 (2.95 g) compared to other experimental groups (p〈0.05). Also, the highest percentage of body protein and lipid content were observed in T4 and T1. In addition, the biomass and percentage of examined plants decreased after delivery of grass carps to each pond over the course of the experiment, but higher decreases were recorded for T4 and T1. The mean values of relative growth rate were higher in T4 and mixture of all plants (p〈0.05). Also, the highest fish biomass was recorded in T1 and T4 (p〈0.05). In conclusion, our results showed that T4 and T1 have higher adaptability compared to other examined plants in the present study and these two plants could be used for feeding grass carp in aquaculture.
    Keywords: Biology ; Fisheries ; Food preference ; Aquatic plant ; Growth ; Grass carp ; Iran
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    Format: 1278-1286
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  • 8
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    Sex steroid levels, reproductive indices and histological examination of gonads in adult male and female Caspian shemaya, Alburnus chalcoides (2021)
    In:  http://aquaticcommons.org/id/eprint/23164 | 18721 | 2018-06-19 15:05:39 | 23164 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-13
    Description: Reproductive status of Alburnus chalcoides adults from Anzali Wetland was investigated by histological examination of gonads, assessment of sex steroids (i.e. Progesterone (P), Estradiol-17ß (E2), Testosterone (T)) and reproductive indices (i.e. absolute fecundity, oocyte diameter, hepatosomatic index (%HSI) and gonadosomatic index (%GSI)). Totally, 42 females and 16 males were captured during March to May 2014 by gill net and divided into two age groups including 2 year olds and 3 year olds. In each age group, fish were classified into two groups depending on maturation stage i.e. matured and maturing fish. According to the results obtained, in each age group, there were no significant differences between matured and maturing males and females in terms of absolute fecundity (p〉0.05). In each age group, oocyte diameter was higher in matured fish than in maturing individuals (p〈0.05). In 2 year old males and In 3 year old females, higher HIS values were recorded in maturing fish compared to matured fish. In females, the plasma levels of E2, T as well as P were significantly higher and lower in maturing fish and matured individual, respectively. In males, only plasma T was higher in matured fish compared to maturing fish and other assayed steroids did not show significant differences. Also, the histological examination of gonads from 10 males and females showed that all fish were in the final maturation stages.
    Keywords: Biology ; Fisheries ; Sex steroid ; Reproductive indices ; Histology ; Alburnus chalcoides ; Anzali Wetland ; Iran
    Repository Name: AquaDocs
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    Format: 1325-1332
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  • 9
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    Occurrence and intensity of parasites in pike (Esox lucius) in River of Chamkhaleh (2021)
    In:  http://aquaticcommons.org/id/eprint/23643 | 18721 | 2018-07-14 23:48:04 | 23643 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-14
    Description: Pike (Esox lucius) of Chamkhaleh River in Langrood (Iran) was studied from winter 2003 to autumn 2004. We collected 123 specimens of the fish and sent them live to the lab for examinations. Biometrical measurements, age and sex determination were conducted on the samples. The eye, skin, gill, digestive system, muscle and other organs of the specimens were examined for parasite infestation. Seven parasites: Raphidascaris acus, Camallanus lacustris, Diplostomum spathaceum, Tetraonchus monenteron, Triaenophorus crassus, Corynosoma strumosoum, Lernaea sp. were found in the pikes of the Chamkhaleh River. The most prevalent parasite was R. acus (37.39%) and the least were C. strumosum and Lernaea sp. (0.81% each). The highest mean intensity of the parasites was related to T. crassus (8.45 specimens) and the lowest was detected for Lernaea sp. (0.01). The highest range in parasite infection was seen for R. acus (1-45) and the lowest for Lernaea sp. with only one individual parasite. We observed seasonal, age and sex differences in infection rate with the parasites. This is the first time report of the pike as a host for C. strumosum.
    Keywords: Fisheries ; Health ; Age ; Skin ; Freshwater fish ; Digestive system ; Gills ; Freshwater ; Sex determination ; Eyes ; Muscles ; Tetraonchus monenteron ; Raphidascaris acus ; Diplostomum spathaceum ; Esox lucius ; Camallanus lacustris ; Corynosoma strumosoum ; Triaenophorus crassus ; ISW ; Guilan Province ; Iran
    Repository Name: AquaDocs
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    Format: 37-50
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  • 10
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    A survey on lethal concentration of Cu and Pb in Caspian Sea Kutum (Rutilus frisii kutum) (2021)
    In:  http://aquaticcommons.org/id/eprint/23690 | 18721 | 2018-07-18 07:20:16 | 23690 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: The Guilan province in the north of Iran has witnessed a rapid industrial development in recent years causing pollution of water resources in rivers, wetlands and the Caspian Sea coastal areas. We studied the acute toxicity of Copper and Lead in kutum fingerlings through acute toxicity and M.A.C value determination in summer and autumn 2006. A total of 21 aquariums with a capacity of 30 liters each stocked with 10 fingerlings were used in our experiments with the two metals. Six aquaria and six concentrations of Cu and Pb composed the 18 treatments while 3 other aquaria were used as control. For each treatment, three replications were conducted. The relevant physical and chemical parameters of water during the experiments were measured including pH which was in the range 7-7.5, DH=200-250mg/l (CaCO _3), DO= 80% and temperature which was recorded as 24 plus or minus 1°C. Fish investigations were conducted in 24 hour intervals. The results indicated that the lethal concentration (LC sub(50)96h) for Copper and Lead are 1.92mg/l and 252.12mg/l respectively and M.A.C. value for Copper and Lead are 0.192mg/l and 25.212mg/l respectively in the Caspian Sea kutum. Hence, we conclude that Copper is more toxic than Lead for the fish.
    Keywords: Biology ; Pollution ; Bioaccumulation ; Lethal effects ; Lethal limits ; Replication ; Heavy metals ; Fingerlings ; Water resources ; Toxicity ; Copper ; Freshwater fish ; Lead ; Wetlands ; Rutilus frisii ; Brackish ; Caspian Sea ; ISW ; Caspian Sea Eurasia ; Iran
    Repository Name: AquaDocs
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    Format: application/pdf
    Format: 169-174
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