Developer is Contendo, best known for their Garbage Truck "Simulator"
I finally bought the german game, and... I'm sorry I started this thread. Hochseefischen is a boring low-budget game with primitive boat controls (feels like driving a slow car), top-notch shader effects over poorly modelled 3D, horrible sound, flat seas and... not much to do really, although in a tedious way. Might be good enough for young german casual gamers, but it's not worthy of a mention on the Ship Sim forums ! Sorry !