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Nazari R.M.,Rajaei Sturgeon Fish Farm | Ghomi M.R.,Islamic Azad University at Tonekabon
Italian Journal of Zoology | Year: 2010

The reproductive biology of fish has been a field of wide interest. The aim of this study was to determine the correlations between sex steroid hormones and maternal characteristics and larvae in the Persian sturgeon Acipenser persicus. The blood samples were derived from 22 female specimens in reproductive stage IV (migration of nucleus) for measuring testosterone (T), 17β-estradiol (E2), and progesterone (P4). As a result, T demonstrated a significant correlation with E2 (r = 0.44) and P4 showed a significant relationship (P < 0.05) only with the larval survival rate after the feeding stage (r = 0.52), but other variables did not demonstrate any significant correlation with one another. There was not a significant relationship in female Persian sturgeon between steroid hormones and size. © 2010 Unione Zoologica Italiana. Source


Ghomi M.,Islamic Azad University at Tonekabon | Zarei M.,Rajaei Sturgeon Fish Farm | Sohrabnejad M.,Tarbiat Modares University
Acta Biologica Hungarica | Year: 2011

Because of the effect of photoperiod on physiological and biochemical processes in fish, this study aimed to evaluate the effect of manipulated photoperiod on growth, feed conversion and survival of wild carp, Cyprinus carpio. Fish received six photoperiod regimes (light:dark cycle) including: natural photoperiod (control), 24L:0D, 16L:8D, 12L:12D, 8L:16D and 0L:24D by the three replications. Regulated photoperiods as a 16L:8D or 12L:12D light/dark cycle significantly improved growth rate and food conversion ratio of wild carp. © 2011 Akadé miai Kiadó, Budapest. Source


Ghomi M.R.,Islamic Azad University at Tonekabon | Nazari R.M.,Rajaei Sturgeon Fish Farm | Sohrabnejad M.,Tarbiat Modares University | Ovissipour M.,Gorgan University of Agricultural Sciences and Natural Resources | And 6 more authors.
African Journal of Biotechnology | Year: 2010

The beluga sturgeon is considered as the most important species for caviar production. This study aimed to evaluate effects of photoperiod manipulation on growth factors of beluga sturgeon. The six photoperiod regimes (light: dark cycle) including natural photoperiod (control), 24L: 0D, 16L: 8D, 12L: 12D, 8L: 16D and 0L: 24D with the three replicates. The treatment 5 (8L: 16D) gained the greatest final weight (2194.4 g) after 73 rearing days and besides, the treatments 4, 3 and 1 (12L: 12D, 16L: 8D, and Control) can be considered as the good photoperiod regimes for beluga sturgeon. The continuous light (24L: 0D) and continuous dark (0L: 24D) significantly (P < 0.05) reduced the final weight of fish to 1804.2 g and 1976.1 g, respectively. Regulated photoperiod significantly improve growth rate and food conversion ratio of beluga sturgeon. © 2010 Academic Journals. Source


Nazari R.M.,Rajaei Sturgeon Fish Farm | Modanloo M.,University of Tehran | Ghomi M.R.,Islamic Azad University at Tonekabon | Ovissipor M.R.,Gorgan University of Agricultural Sciences and Natural Resources
Aquaculture International | Year: 2010

For studying the effect of LHRH-A2 hormone on the induction of final maturation and ovulation of Persian sturgeon, 71 matured females and 20 matured males were used. Five groups of breeders were injected with sturgeon pituitary gland hormone (50 mg per fish) and LHRH-A2 in dosages of 3.5, 7, 8 and 10 μg kg-1 for females and 3 and 5 μg kg-1 for males. Results showed that LHRH-A2 successfully induced final maturation and ovulation in females, and there was no significant difference between five groups of breeders in ovulation proportion, fertilization rate, survival rate of incubation, survival of yolk-sac absorption period and active feeding period of larvae. It can be concluded that the LHRH-A2 is a proper alternative for pituitary gland hormone in artificial propagation of Persian sturgeon. © 2009 Springer Science+Business Media B.V. Source


Ghomi M.R.,Islamic Azad University at Tonekabon | Nazari R.M.,Rajaei Sturgeon Fish Farm | Poorbagher H.,University of Tehran | Sohrabnejad M.,Tarbiat Modares University | And 4 more authors.
Comparative Clinical Pathology | Year: 2011

This study investigated the effect of manipulated photoperiod on haematological parameter in beluga sturgeon (Huso huso). One hundred eight fish (24-month old) were randomly allocated into 18 tanks. Each tank received one of six photoperiod regimes for 73 days: natural photoperiod, 24Light (L):0Dark (D), 16L:8D, 12L:12D, 8L:16D and 0L:24D. Different photoperiods had no significant effects on hormonal and cytological features of blood in young beluga sturgeon. © 2010 Springer-Verlag London Limited. Source

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