| Abstract |
A s p a w n i n g g r o u n d of Allis S h a d (Alosa alosa L.) w a s d e s c r i b e d in t h e u p p e r R. Loire a n d the reproductive behaviour was observed during the course of spawning season in 1988. The s p a w n i n g g r o u n d w a s c h a r a c t e r i z e d by the p r é s e n c e of a g r o y n e a n d by the a b u n d a n c e of fine materials in the substrate (sand an gravel). Reproduction w a s mainly nocturnal with a stronger intensity at mid-night. The spawning activity was correlated negatively with the daily flow rate and was not influenced by water température. The number of adults was estimated to about 34.200 individuals. |