Reproduction of Wild Brood Fish from Garonne Basin

The start of the restocking programme is described with reference to available knowledge and the difficulties faced (facilities, availability of wild-origin brood fish). Next, there is a summary of the number and quality of brood fish with respect to river (Garonne or Dordogne), gender (sex ratio), and the decline in by-catch over time following the total protection of the species. Changes in biometry over time are reported. The reproductive status of brood fish is analyzed with regard to the stage of the ovarian follicles and the sperm quality. The oosomatic index data are re-analysed. Hormonal stimulation treatment details are provided over time, with special reference to those used repeatedly to overcome the current non-simultaneity of both genders. Limited data on mating, embryogenesis, and larvae are provided.