Brook Trout are not genetically programmed to die after spawning as are the Pacific species of salmon. Spawning is however difficult and dangerous and many fish do die during spawning. The length of the incubation period varies according to the temperature - at lower temperatures the incubation period is longer.
More than half of the total length of the German autobahn network has no speed limit, about one third has a permanent limit, and the remaining parts have a temporary or conditional limit. Some cars with very powerful engines can reach speeds of well over 300 km/h (190 mph).
Updated - February 2016. It's true: there are no speed limits on many sections of German autobahns. But there are plenty of other regulations you should be aware of. Driving in Germany can be a delight: the scenery is beautiful and the roads are well maintained. But there are many rules and regulations to observe.