The lizard genus Lacerta and fish genus Phoxinus are the only other known examples of diploid-triploid mosaicism.
The current water quality allows for a stable fish fauna, with five species populating the river, namely salmon (extinct in 1940 and restored thanks to the re-population programs of 1980s), trout, ezkailu (Phoxinus phoxinus), loach and eel.
Phoxinus |