Maritime history of the United Kingdom and echo sounders making life easier now. Fishing in waters off Iceland became important, which led to three "Cod Wars" from the 1950s to the 1970s. British boats were excluded from Icelandic waters in 1976. In 1977 a fishing limit was set up by the European Economic Community, and British waters were opened to other Community members. This led to overfishing. Landings decreased 28% between 1967 and 1997, with fishing now mainly off Scotland. Other sorts of fishing also take place on a commercial basis such as for crab, lobster, shellfish and mackerel. Sport fishing is popular from coasts and
Blue cod change. Since a number of evidence indicated that blue cod are relatively sedentary, the fishing pressure may lead to potential local depletion. Recent studies showed that the genetic differences were significant between mainland List of islands of New Zealand population and Chatham Island population. On the other hand, the differences within mainlandList of islands of New Zealand populations were limited while the pattern of the isolation by distance was detected. Further research using microsatellite DNA markers suggested that some significant genetic differences between mainland population exist which indicate the potential long-distance dispersal, but the dispersal rate is too low to