Rayons de la nageoire anale d'un barbeau fluviatile

Rays of the anal fin of a barbel, Barbus barbus. This image shows the structure of the fin: its segmentation and the presence of three spines on the leading edge followed by branched soft rays. Laboratory experiments on the barbel help improve understanding of the characteristics of its life cycle, notably the crucial stages of its development. In particular, research scientists can study its growth thanks to otoliths. They can then target actions to promote the ecological restoration of this species. Indeed, the barbel is a species characteristic of several areas of the Rhône whose life cycle is affected by the numerous hydroelectric developments there.