List of Articles Specific Growth Rate

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  1 - Sub-Lethal Effects of Exposure to Copper Oxide Nanoparticles on Growth Indices and Body Biochemical Composition of Common Carp (Cyprinus Carpio)
  hasan sahraei Seyyed Abbas Hoseini Seyyed Aliakbar Hedayati Rasoul Ghorbani
  10.22034/jest.2021.14246.2288
  Background and Objective: Due to the increasing use of nanoparticles in human activities, as well as its role in reducing the adverse effects of heavy metals on living organisms, at this study the effects of sub-lethal concentrations of copper nanoparticles were discuss More

  Background and Objective: Due to the increasing use of nanoparticles in human activities, as well as its role in reducing the adverse effects of heavy metals on living organisms, at this study the effects of sub-lethal concentrations of copper nanoparticles were discussed on growth factors and biochemical composition carcass of common carp. Method: 82 carp with an average weight of 42 ± 2 g was prepared and after adaptation for the laboratory condition, were exposed at 42 days at three treatments (10, 40, 80 ppm) and three replicates respectively, also a control group were prepared with three replications under the affect of sub-lethal concentrations of copper oxide nanoparticles. Findings: Analysis of growth indices showed that all growth indices had significantly different (P<0/05) with metal treatments in compared to the control group. So the control group had the highest average body weight, percent of body weight, SGR rate, and feed conversion efficiency with averaging 2.93. The lowest specific growth rate and the highest rate of conversion were related to the treatment number three (80 ppm), respectively. The amount of ash, fat, protein and maximum moisture was observed at the control group. The highest percentage of protein and fat was at treatment (3) and concentration of 80 milligrams per litre of copper oxide nanoparticles that in this regard showed significant differences (P<0.05) with the control group. Discussion and Conclusion: The results indicate that the presence of copper oxide nanoparticles in aquatic ecosystems have negative effects on growth and biochemical composition of fish carcasses even at sub-lethal concentrations, that by increasing the concentration of the nanoparticles in aquatic ecosystems, the influence of these effects will become clearer. Manuscript profile
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  2 - Comparison of Growth factors in Monosex Rainbow Trout and Ordinary Fish Cultured in Raceway Pounds
  H. Hosseinzadeh Sahhafi T. Bashti D. Zargham
  In many species of finfish, females exhibit higher growth rates than males and achieve larger sizes. In addition, in some species, males mature before reaching marketable size. Therefore, there is great interest among fish farmers to produce all-female stocks. In this p More

  In many species of finfish, females exhibit higher growth rates than males and achieve larger sizes. In addition, in some species, males mature before reaching marketable size. Therefore, there is great interest among fish farmers to produce all-female stocks. In this project we tried reversing the sex of rainbow trout larvae using 17β estradiol and direct method, further more finding the optimum dose of this natural estrogen for endocrine sex reversion of rainbow trout (O. mykiss). Treated females (12±1 g.) were tagged with implant elastomer tag (ABC tag) and released into 11 farms in Kohkiloieh, Fars and Charmahal Provinces. Each farm received 3000 tagged fingerlings. After 6 months Specific growth rate, condition factor and growth performance were calculated for each farm. Results revealed that mono-sex females have better Growth rate than other (males) and the average weight was 342±11 while 317±9 for males. Specific growth rate was 2.1, 2.2 and 1.9 for mono-sexed females, normal females and males respectively. Weight gain was 258, 261 and 232 for mono-sexed females, normal females and males respectively. Condition factor also was 1.1, 1.1, and 0.9 for mono-sexed females, normal females and males respectively. There were significant differences between Gonad weight of males (32 g.) and females (3.4 g.) (P<0.01). Results confirmed the increasing of flesh capacity production in mono-sex females of rainbow trout. Manuscript profile