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  • 1
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    Investigation of chromosome and ploidy levels of rainbow trout produced from imported eyed eggs (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25825 | 18721 | 2018-10-13 10:43:05 | 25825 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Rainbow trout is the main cultural species of coldwater fishes in iran. Often, aquaculturists intend to breeding in order to production of lines with higher growth rate potential and disease resistant. Nevertheless in the country, no trout breeding programs, has been performed yet and most of the farms focused on the cultivation of the first (unbred) race. While European countries progressed in trout breeding techniques and production lines with higher growth through genetic manipulation (chromosomal number and type changes of fish) and/or selection and their fish products derived from this technology, including eyed eggs and so on have sold to other regions of the world (eg: Iran). In this study, some biological parameters including survival, growth, feed conversion ratio (FCR.) and chromosomal number of two juvenile groups from imported( group 1) and native(group 2) eyed fish eggs were compared. For chromosomal investigation, blood smear test and flow cytometry were performed. sults showed a significant difference (P≤5%) in growth rate of native fishes and French group Native fish feed conversion ratio (0.9) was significantly difference (P≤5%) from that of French fishes (1.15). Chromosomal analysis showed no difference in chromosome number in treatments and two fish groups were 2n chromosome. Based on the results, the fishes of group 1 had faster grow potential and gain weight in less time than that of group 2 and this has been achieved to go through the process of selection and feminization without any change in number of ploidy. Whereas the ability of native fishes in food efficiency ( lower FCR.) was better. However, the reduction of rearing period is the benefit and preference of cultivation of imported or origionally foreign.
    Keywords: Aquaculture ; Biology ; Iran ; Imported eyed egg ; Native fish ; Ploidy level ; Growth ; Rainbow trout ; Chromosome ; Species ; Breeding ; FCR
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 30
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  • 2
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    Induction of population triploid-interploid in rainbow trout (Oncorhynchus mikiss) using by indirect (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25827 | 18721 | 2018-10-13 10:47:16 | 25827 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Induced polyploidy is a suitable tool for producing sterile fish which made commercial benefits in the aquaculture industry. This study carried out in order to produce triploid-interploid population via mating tetraploid female with diploid male rainbow trout. Heat shock was used for making tetraploid population and the best temperature and induction time were examined. Result showed that highest mortality from 1 day after fertilization to emerging were in groups 6 of embryos (40.1%) and the lowest were in groups 3 (33 %). Flowcytometry results showed that some fish were polyploidy. Comparative analyze of genome levels in tetraploid fish to control fish (diploid) and hen as standard indicator, confirmed tetraploid fishes in this study. In conclusion we can state that heat shock induction for 7 minutes at 65 hour –degree after fertilization in 28ºC is optimum temperature for inducting tetraploid rainbow trout.
    Keywords: Aquaculture ; Biology ; Iran ; Sexual development ; Triploid interploid ; Tetraploidy ; Heat shock ; Flow cytometry ; Rainbow trout
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 43
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  • 3
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    Effects of different levels of folic acid and vitamin C in rainbow trout (Oncorhynchus mykiss) (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25332 | 18721 | 2018-09-13 12:55:23 | 25332 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Juvenile rainbow trout, Oncorhynchus mykiss (initial body weight 14 ± 0.25 g) were fed diets [crude protein 420 g/kg; gross energy 16.8 MJ/kg dry matter; crude fat 110 g/kg] containing deficient, adequate or excessive amounts of vitamin C and folic acid to investigate the potential nutritional effects on growth factors. A growth trial was conducted over 9 wks at a water temperature of 12 ± 1 °C. Four semipurified diets were supplemented with 0, 30, 60 and 90 mg /kg vitamin C and 0, 1, 2 and 3 mg/kg folic acid and were fed to fish in triplicate tank for 9 wks. At the end of the growth trial, the percent of survival, final body weight, weight gain, feed intake, feed conversion ratio, protein efficiency ratio and specific growth rate were measured. The results that growth factors were significantly (P〈0.05) affected by dietary vitamin levels. Inclusion levels of 2 mg/kg dietary folic acid and 60 mg/kg dietary vitamin C is acceptable, for use in rainbow trout diets, under favorable economic conditions. This study shows that increasing dietary folic acid and vitamin C could improve growth performance in juvenile rainbow trout.
    Keywords: Aquaculture ; Iran ; Nutrition ; Folic acid ; Vitamin C ; Rainbow trout ; Oncorhynchus mykiss ; Juvenile ; Growth ; Survival
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 40
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  • 4
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    Rainbow trout broodstock and progenies registration and selection of Yasouj Fishery Research Center in order to breeding (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25456 | 18721 | 2018-09-25 18:08:14 | 25456 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Frequently,the development of quantitative traits in livestock based on breeding programs has been more important. In spite of higher selection response in fish than in farm animal, it is no progress in fish breeding programs in some regions such as IRAN, because of little information of genetic variation of stock, disconstructed or undesigned base population, the deterioration of genetic resourse and don’t well informed educated researchers, extension workers and aquaculturist in breeding theory and its practical issues. At first step, in Yasouj Coldwater Fishes Breeding Research Center, in order to conducting combined selection program in rainbow trout broodstock as base population and their off springs in mixed age parents,150 female and male broods with higher mean weight were selected, striped in 6 stage and eggs were incubated. One-year Fishes(45000 pcs.) of the six groups with higher mean weight in 5 stage were selected(438 pcs.) and remainder was discarded. Before selection, a few fishes of six aged-groups as control group were cultured apart. Difference (p〈0.05) induced between mean weight of the selected groups and with control group was because of age difference in them and of no deletion in control group(don’t throw out small individuals) by selection. The whole groups don’t have significant difference (p〉0.05) in FCR and FER. Based on results, it isn’t told that difference between experimental and control groups is a result of genetic improvement of growth rate trait induced of selection process in one generation and the continue of this program for several generations in order to reveal the development of a quantitative trait is unevitable and mating of selected broods (438 fish) in a crossbreeding program and the selection of off springs is essential.
    Keywords: Aquaculture ; Iran ; Yasouj ; Rainbow trout ; Breeding ; Selection ; Broodstock ; Genetic variation ; Genetic ; Growth Rate ; Generation
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 26
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  • 5
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    The effect of thyroxine on percentage of hatching (Hypophthalmichthys molitrix) (2021)
    In:  http://aquaticcommons.org/id/eprint/24791 | 18721 | 2018-08-06 15:59:08 | 24791 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Studies showed that Thyroxine can play an important role on fish growth, osmoregulation system, and other physiological activities. Since the direct effect of thyroxine on growth and metamorphose of bony fish larvae has not been yet approved, therefore, present study were carried out in Shahid Ansary propagation and cultivation farm in order to find out the way of effect of this hormone on the survirval rate and early growth stage of silver carp (Hypophthalmichthys molitrix) fertiled eggs that were bathed in thyroxin with concentrations of 0.1, 0.5 and 1.0 ppm (each one, replicates) for 6 hours. Then they were transfered into large incubators (zoog) with running water. After hatching all larvae were placed in mentioned thyroxin concentration bath for another 6 hours before being transfered into large incubators. Larvae stayed inzoogs until the yolk-sac was absorbed. Finally, live silver carp larvae were counted in separated plates. Results of present study indicated that the ra tio of hatched eggs in 0.5 ppm of thyroxin concentration was higher than other treatment.
    Keywords: Aquaculture ; Biology ; Thyroxine ; Egg ; Hypophthalmichthys molitrix ; Larvae ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 167-174
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  • 6
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    Effects of dietary of Artemia urmiana nauplii enriched with fish and vegetable oil on body composition of Rainbow trout, Oncorhynchus mykiss (2021)
    In:  http://aquaticcommons.org/id/eprint/25961 | 18721 | 2018-11-19 09:53:44 | 25961 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-24
    Description: HUFA (highly unsaturated fatty acids) content is one of the most important indices for determination of food value in fish larvae feeding. The HUFA has also an important role in fish larvae health, growth and survival. Because of this, enrichment methods for increasing of HUFA content in Artemia nauplii was developed. The aim of this study was to determine the impacts of dietary of fish and vegetable oil on Rainbow trout, Oncorhynchs mykiss, body composition. The experiments were carried out in six different treatments with three replicates for 2 weeks. The feeding treatments during the first 10 days included: 1) Commercial diet, 2) A. Urmiana nauplii enriched with fish oil, 3) A. urmiana nauplii enriched with Sunflower oil, 4) A. urmiana nauplii enriched with Canola oil, 5) A. urmiana nauplii enriched with Soybean oil, 6) Newly hatched un-enriched A. urmiana nauplii. The highest concentrations of fatty acids in diet were oleic, palmitotic, linoleic, eicosapentaenoic acid (EPA) and stearic acid, while in larvae tissue of trout in all treatments were oleic, linolenic, linoleic, stearic and docosahexaenoic acid (DHA), respectively. The concentrations of eicosapentaenoic acid [20:5(n-3)] in contrast with docosahexaenoic acid [22:6(n-3)] in the Commercial diet were significantly reduced (P〈0.05). The highest concentrations of EPA was observed in nauplii enriched with fish oil in which statistically significant in comparison with the other treatments (P〈0.05). The DHA content in newly hatched non-enriched nauplii and nauplii enriched with vegetable oil were zero. The results showed that vegetable oil (Canola, Sunflower and Soybean) in comparison with fish oil give more suitable results and thus, the present study suggests that early life stage of larvae growth can be feed wih nauplii enriched with Canola oil.
    Keywords: Aquaculture ; Iran ; Dietary ; Artemia nauplii ; Vegetable oil ; Body composition ; Rainbow trout ; Oncorhynchus mykiss
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 92-102
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