Rivers and seas are constantly in motion, due to this motion huge production is achieved which is why they represent valuable habitats for fish and a wide diversity of all different life forms. Some fish travel between both worlds. They strive for the fitting environment for each stage of their lives. Among these travellers is the sturgeon, the largest resident of our rivers. You can discover on the following pages how the rivers connect to the sea, which animals travel where, and why the sturgeon, with its shark-like appearance and its bony armour, is a very special fish indeed.