Main Ref: | Valladolid, M. and M. Pryzbylski, 2008 | |||||||||||
Data Ref.: | Valladolid, M. and M. Pryzbylski, 2008 | |||||||||||
Country: | Spain | |||||||||||
Spawning ground: | riverine | |||||||||||
Locality: | River Lozoya, Tajo Basin, 1990 | |||||||||||
Season: |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
111 | 111 | |||||||||||
Sex ratio: | 60 % Ref.: Valladolid, M. and M. Pryzbylski, 2008 | |||||||||||
Temperature: | - °C | |||||||||||
Gestation period: | month/s | |||||||||||
Length of offspring: | cm | |||||||||||
Batch spawners | ||||||||||||
Daily spawning frequency |
- Mean: |
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Min Ref.: Max Ref.: Mean Ref.: |
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Comments: | The fecundity-length relationship refers to total fecundity assuming all oocytes in ovaries mature during spawning. However, oocyte distribution was multimodal and such asynchronous development of oocytes suggests multispawning of this species. The largest vitellogenic oocytes measuring 1.2 to 1.8 mm in diameter were observed only in April and May, coinciding with high GSI. Batch fecundity based on 9 specimens was not significant: Fb = 0.00036×SL^2.252; r2=0.255, p=0.247. (Ref. 84812). |