History of the North Sea great herring fishing industry resulting in Scotland becoming a European leader in that industry. During the First Schleswig War (1848–51), the Crimean War (1854–56) and the Second Schleswig War (1864), belligerents took steps to reduce or eliminate commerce in the North Sea by their enemies. In the first Schleswig War, Denmark was able to halt maritime commerce by Germany in the North Sea and in the second, imposed tolls on ships crossing through the Danish straits between the Baltic and North Seas. The Crimean War saw British and French expeditions sent into the Baltic to prevent Russian ships' egress into
Wildlife of the Falkland Islands sea. Introduced brown trout, have been established in many freshwater streams and have also formed sea-runs resulting in an increase in body size. Due to the introduction of brown trout and other fish species the endemic zebra trout (a galaxiid fish unrelated to typical salmonid trout) is now restricted to small streams in remote parts of West Falkland and Lafonia. Different species of krill are found in Falkland waters, with lobster krill inhabiting the warmer waters in the north. Vegetation on the archipelago is composed of grasses, ferns, and shrubs. Around 363 species of vascular plants have been recorded on