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).
The first maximum speed law for Mexico was created in 1903 by then president Porfirio DÃ­az. It established a maximum of 10 km/h (6 mph) for small and crowded streets, and 40 km/h (25 mph) elsewhere. Current speed limits are: 10 km/h (6 mph) in parking lots and residential areas; 60 km/h (37 mph) in streets with no speed limit 60â80 km/h (37â50 mph) on urban arterial roads (ejes, calzadas, beltways and freeways) 80 km/h (50 mph) in avenues with no speed limit