| FishBase |
| Main Ref: | Heckman, C.W., 1991 | ||||||||||||
| Country: | |||||||||||||
| Locality: | Volga, Vyatka, Kama, Oka and Ural rivers and their tributaries | ||||||||||||
| Ecosystem: | |||||||||||||
| Absolute Fecundity | Fecundity Type: | ||||||||||||
| min 135,000 | (g) | (cm) | Ref: | ||||||||||
| max 312,000 | (g) | (cm) | |||||||||||
| mean | (g) | (cm) | |||||||||||
| Comments on Fecundity: | |||||||||||||
| Relative Fecundity | |||||||||||||
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| Fecundity/length relationship ( F = a * L ^b): | |||||||||||||
| Size: (cm) | |||||||||||||
| n: | |||||||||||||
| a: | 95% confidence limit: | ||||||||||||
| b: | 95% confidence limit: | ||||||||||||
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| Spawning Cycles: | (1/y) | Ref: | |||||||||||
| Comments: | Reproduction peaks from mid-June to mid-July. Peak spawning noted between 18° and 20°C. Individuals usually spawn intermittently for 25-50 days, most intensively between 1600 and 2200 hrs. Ripe eggs are 1.31-1.51 mm in diameter, swelling to 2.62-3.68 after fertilization. Eggs maintained at about 19.6°C hatched within 49 hrs. and within 42 hrs. at 20.4°C. Hatchlings of 4-6 cm seen moving downstream. | ||||||||||||
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