Relationship between biological characteristics of eggs and female brood stocks of Persian sturgeon Acipenserpersicus: a comparison with other fish species |
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Authors: | Mohammad Reza Imanpoor Sayed Hadi Alavi Jacky Cosson |
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Affiliation: | (1) Agricultural Sciences and Natural Resource, University of Gorgan, Gorgan, Iran;(2) Research Institute of Fish Culture and Hydrobiology, University of South Bohemia, Vodnany, Czech Republic;(3) UMR 7009, CNRS and UPMC, Marine Station, 06230 Villefranche sur Mer, France; |
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Abstract: | We have determined a number of biological characteristics of the Persian sturgeon egg (including diameter, surface-to-volume ratio, yolk sphere and perivitelline space) and of female brood stocks (including age, length, weight, condition and absolute fecundity) in 420 specimens of the migratory population of Acipenser persicus in Gorgan bay of Iran from 2001 to 2004. In the hydrated egg, the average egg diameter, yolk diameter, surface-to-volume ratio and yolk sphere-to-perivitelline space ratio values were: 3.64 ± 0.17 mm, 3.26 ± 0.25 mm, 1.65 ± 0.08 and 0.75 ± 0.01, respectively. In this chondrostean species, the egg surface and volume were found to increase with increasing egg diameter, but the egg surface-to-volume ratio decreased. In Persian sturgeon, the surface-to-volume ratio and yolk sphere-to-perivitelline space ratio is very high; therefore, the metabolic rate is low and female spawning occurs in low-temperature waters. The statistical Pearson correlation between egg diameter relative to a number of brood stock characteristics, including fork length (r = 0.059), weight (r = 0.140), age (r = 0.081) and absolute fecundity (r = 0.095), were not significantly different (P > 0.05). An extensive comparison of these results with data published on other fish species is presented and discussed. |
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