Sur l'extension en France du Black-Bass à grande bouche (Micropterus salmoïdes Lacepède) et de l'Écrevisse américaine (Cambarus affinis Say)

Click to increase image sizeClick to decrease image size

Summary

The large-mouthed Black-Bass (Micropterus salmoīdes Lacepède) and the american cragtish (Cambarus affinis Say) were introduced in some European water courses at the beginning of this century. Since then the expansion of both species has never ceased but has developped in quite different ways for each of them; while the expansion is very fast for the american cragtish, which is plentiful in the Seine and Loire basins and in the Saone river, on the contrary in spite of the many attempts of introducing it, carried out by Fishermen Societies, the large-mouthed Black-Bass, though now acclimatized in a number of sites, is not over thriving. It may be found mainly in the lower Saone, in the Charente, in the Tarn and, generally in the Garonne Basin and the Southern canal.