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Open Access Article
1 - Evaluation of different dietary energy levels on some growth performance, survival and body composition of narrow clawed crayfish (Astacus leptodactylus)
Abstract In this study, three practical diets containing three levels of digestible energy 300, 370 and 450 Kcal/100g and 30% crude protein for rearing of Astacus leptodactylus was prepared. Effects of MoreAbstract In this study, three practical diets containing three levels of digestible energy 300, 370 and 450 Kcal/100g and 30% crude protein for rearing of Astacus leptodactylus was prepared. Effects of these diets were determined on growth index, survival and body composition. In this experiment, it used three treatments each had three repetitions. The crayfish rearing was done for 60 days in 9 fiberglass tank with 110-liters capacity. Average of initial weight of the crayfish was 17±2.3g. Results indicate the highest SGR, PER, NPU, WG. Survival and protein of body composition occurred in the diet with 370 kcal/100 g energy which has no significant difference. Manuscript profile -
Open Access Article
2 - Investigate the possibility of rearing fish in cages in the southern coast of Caspian Sea with emphasis on the parameters of temperature, salinity and dissolved oxygen water
Abstract[1] Fish cage culture due to global demand in recent years has increased dramatically and now as the fastest way in response to global needs, especially in developing countries. Forecasts show that in developing countries, fish consumption up to 57% from 1997 ( MoreAbstract[1] Fish cage culture due to global demand in recent years has increased dramatically and now as the fastest way in response to global needs, especially in developing countries. Forecasts show that in developing countries, fish consumption up to 57% from 1997 (62.7 million tons) to 2020 (98.6 million) increase. Studies in Iran, did not receive continuous on the cage culture. The study area was the southern part of Caspian Sea. The study objectives include determining areas and introduced species of fish farm with an emphasis on depth and some physical and chemical parameters (temperature, salinity and dissolved oxygen) in various layers of the water and were in different seasons. The results showed that in the south central area of the Caspian Sea in Mazandaran province, as has been the best part. Also, the use of floating cages less than 20 meters in depth, it is necessary that the temperature of the fish used 26 °C is tolerated in the summer. Otherwise it must be immersed in the cage and the establishment of more than 20 m depth is used. * Corresponding authors; smv_farabi@hotmail.com Manuscript profile -
Open Access Article
3 - Application of some methods for sexual maturation stages detection in sturgeon
Abstract[1] Using of different methods such as biopsy, laparoscopy and trocar methods are necessary for sex detection of sturgeon. In this study, 206 sturgeon including 30 Acipenser persicus, 40 A. nudiventris, 121 Huso huso and 15 Acipenser stellatus 2-7 year - old w MoreAbstract[1] Using of different methods such as biopsy, laparoscopy and trocar methods are necessary for sex detection of sturgeon. In this study, 206 sturgeon including 30 Acipenser persicus, 40 A. nudiventris, 121 Huso huso and 15 Acipenser stellatus 2-7 year - old were studied. Biopsy and histological results showed in A. persicus, 16 were female and 14 were male and in Huso huso, 31 were female and 29 were male, respectively. In laparoscopy method, in farmed A. nudiventris 17 were female, 15 were male and 8 were undetectable and in Huso huso 29 were female, 23 were male and 9 were undetectable. In trocar method in farmed A. stellatus 5 were female, 3 were male and 7 were undetectable. For maturation stages detection in sturgeon, the laparoscopy method was an applicant method because of semi - invasive and inducing lowest stress to fish for detecting males and females at ages upper 2.5 year. Although biopsy method was more invasive, but was more confidence for ages lower than 2.5 year. For adult fish, trocer method was suitable. * Corresponding authors; alihallajian@gmail.com Manuscript profile -
Open Access Article
4 - Photo's color effects and photoperiods on growth and survival rate in Rutilus rutilus caspicus larvae of Caspian sea
Abstract In a fourteen-day period, photo's color effects and photoperiod on growth and survival rate inRutilus rutilus caspicus larvae have studied. The roach larvae have were provided from fish reproduction and culture center of sijual. After adaptation, the larvae ha MoreAbstract In a fourteen-day period, photo's color effects and photoperiod on growth and survival rate inRutilus rutilus caspicus larvae have studied. The roach larvae have were provided from fish reproduction and culture center of sijual. After adaptation, the larvae have stocked with primary weight of 3.1 mg in some tanks (40 lit) which contain just 20 lit fresh water and 100 larvae in each tank. Using fluorescent lights, the researchers have studied two photic treatments which include red and white color and tow photoperiods that consisted of 12L/12D and 24L/00D in four different treatments including red photo and 24L/00D, red photo and 12L/12D, white photo and 24L/00D, and white photo 12L/12D. During the analysis, the temperature was 18-20 0C. The result showed that constant 24-hour red photo caused maximum growth & minimum FCR. It also showed a great difference with other treatment groups. On the other hand, the other two treatment groups of 12L/12D in the red photo & in the white one showed no significant difference with each other. Moreover, photoperiods didn't show any significant difference as larvae survival rate. In all of photic levels; the survival rate was relatively high. Manuscript profile -
Open Access Article
5 - Effect of packaging with nanocomposite film clay/low density polyethylene (LDPE) on the chemical, microbiological and sensory properties fillet of Oncorhynchus mykiss during storage at refrigerator
Abstract Application of Nanotechnology in the food packaging industry in recent years become more widespread and is being commercialized. Add nanomaterials, caused an improvement barrier properties of polymers to gases such as oxygen and carbon dioxide, increased UV ra MoreAbstract Application of Nanotechnology in the food packaging industry in recent years become more widespread and is being commercialized. Add nanomaterials, caused an improvement barrier properties of polymers to gases such as oxygen and carbon dioxide, increased UV rays barrier, mechanical strength, stiffness, stability and heat resistance of the base polymer. in this study composite film with 5% nanoparticles of clay were produced as experimental treatment and low density polyethylene(LDPE) film as a control treatment and was used for packing rainbow trout fillet and kept in the refrigerator. Then to investigate the quality fillets packed on days zero, 5, 10, 15, 20 and 25 was used chemical tests (pH, TVB-N, PV, TBARS), microbial (TVC, PTC, LAB, EBC and H2S producing bacteria) and sensory. Based on the results obtain of the tests and data analysis have been observed significant differences between treatments on different days and thus, shelf-life of rainbow trout fillet have been determined in the control and experimental treatments respectively, 13 to 15 and 18 to 20 days. Manuscript profile -
Open Access Article
6 - Effect of Sperm Activating Solution on Improvement of Reproduction Efficiency of Rainbow Trout (Oncorhynchus mykiss)
Abstract This research has been conducted at the end of propagation season (April) at the Salmonid reproduction and conservation center of Shahid Bahonar–Kelardasht in late 2008. For this order the effect of 4 different saline activator solutions on fertilization MoreAbstract This research has been conducted at the end of propagation season (April) at the Salmonid reproduction and conservation center of Shahid Bahonar–Kelardasht in late 2008. For this order the effect of 4 different saline activator solutions on fertilization rate, eyed eggs and hatching stage were investigated in comparison to water in the reproduction center. After preparing different diluents, 15 males and 10 females were striped. For the measurement of sperm motility, we used light microscope and this period was measured until 95-99% of the sperm cells did not have any mobility. There were significant differences at levels of 95% among different saline activator solutions with the water of propagation center on sperm motility, fertilization, eyed eggs and hatching stage. Results showed that using activator solution with component of NaCl, 7/305 gr/L; CaCl2.2H2O, 0/735 gr/L; pH: 7/7 had the highest fertilization (61.22±3.26%), eyed eggs (57.48±3%) and hatching stage (95/18/.±57%). The noel groups had the lowest fertilization, eyed eggs and hatching stage in comparison of others group. Manuscript profile
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