Abstract
Relationships between insulin-like growth factor-I (IGF-I) and thyroxine (T4) and cortisol hormones were studied in female brood stocks of Persian sturgeon [Acipenser persicus; caught from both sea water (SW) and fresh water (FW)] during late stages of sex maturation. A number of biometrical traits were also studied that could represent the reproductive and/or growth states of brood stocks, and the possible relationship between IGF-I and growth was assessed in juvenile Persian sturgeons between 1 and 4 years of age. IGF-I, T4 and cortisol were measured in serum samples using commercially available kits. A four-parameter logistic model test was performed between the standard curves and the sample dilutions for each hormone. Parallelism, linearity and regression coefficients for the linearized standard curves and serial dilutions of samples were not significantly different (PÂ <Â 0.05). Serum IGF-I levels in the juveniles were higher than those in the SW brood stocks, and cortisol levels in the former were lower than those in both brood stocks (PÂ <Â 0.05). T4 levels in serum samples of juveniles were below the detectable level. IGF-I concentrations in juveniles were correlated with total weight, total length and fork length, but they did not increase significantly with increasing age from 1 to 4 years old (PÂ <Â 0.05). Compared with SW brood stock, the FW brood stock was younger, had a smaller girth, smaller polarization index and higher ova diameter (PÂ <Â 0.05). There were no differences between IGF-I and T4 levels in the two brood stocks, but cortisol levels were significantly higher in the FW brood stock. Percentage of fertilization was correlated with serum IGF-I in both brood stocks (PÂ <Â 0.05). Our results support a role for IGF-I during the juvenile growth and reproductive physiology in female brood stocks of the Persian sturgeon.
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Acknowledgements
We wished to thank R. Kazemi and M. Mohseini and their colleagues at the ISRI for supplying juvenile fish and providing facilities for fish sampling. We are also grateful to the Sad-e-Sangar hatchery for permitting the sampling of brood stocks.
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Kamangar, B.B., Rasaee, M.J., Amiri, B.M. et al. Correlations between circulating insulin-like growth factor-I and thyroxine and cortisol hormone levels, and some biometrical traits in female brood stocks during the late stages of sex maturation and in juvenile Persian sturgeon (Acipenser persicus). Fish Physiol Biochem 33, 249–257 (2007). https://doi.org/10.1007/s10695-007-9137-6
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DOI: https://doi.org/10.1007/s10695-007-9137-6
Keywords
- Growth
- IGF-I
- Persian sturgeon
- Reproduction