Very nice - environmentally friendly, North Africa's additional water supply, and Russian-free. What else can you ask for? Go for it, Germany - good job :)
And, exotic life-forms be damned, imo. Would anyone here complain about the extinction of mosquitoes, Rachel Carson and PETA* excluded? Now consider that other obscure species, while far less annoying, are also quite useless in regards to the economy and the betterment of human lives.
The only marine life of the Baltic that I particularly care for, is the kind that can be fished en masse. And maybe some dolphins.