soon grew so big that its bristles could be seen over the treetops. It strolled around and dug channels in the ground. One day it reached the sea and water broke in. This would have been at the eastern inlet of the Limfjord, at Hals. The legend is also handed down in a medieval ballad with a Christian tint. In the ballad, the pig is summoned to a Thing by peasants to pay for the damage to their crops, and it is sentenced to the breaking wheel. The state environmental surveillance vessel Limgrim, based at Skive, is named after the legend. Limfjord poets A number of writers of the Modern Breakthrough period (1870-1890) and the next decades came from the area around the Limfjord and often used it as a lyrical motif, or a setting for their prose. These include Jens Peter Jacobsen of Thisted, Johan Skjoldborg of Hannæs, Jakob Knudsen of Aggersborg, Jeppe Aakjær and Marie Bregendahl of Fjends, Nobel Prize laureate Johannes Vilhelm Jensen of Farsø and his sister Thit Jensen. Thøger Larsen of Lemvig belonged to the symbolism of the 1920s. Johannes Buchholtz in Struer was a prose writer and his home was a meeting point for many of the Limfjord writers. The house is still kept up by the Struer Museum, which allows visitors. Jeppe Aakjær's farm Jenle close to Skive, Johan Skjoldborg's house in Øsløs, and the Johannes V. Jensen Museum in Farsø are also open to the public. Erik Bertelsen of Harboør is best known for the song Blæsten går frisk over Limfjordens vande ('The Wind Goes Fresh over the Limfjord's Waters'), a much-used "local anthem". The later ones of these Limfjord writers, along with a few others, formed the Jutland Movement, which revolted against the symbolism of the early 20th century. Instead, they wrote social realistic prose, often about poor and exploited people in the countryside, who were a part of Danish society little known to the establishment in Copenhagen. Biology and climate The western breakthrough of 1825 changed the waters of the Limfjord from brackish to salty, with a considerable current from west to east. Hypoxia sometimes occurs due to warm windless periods in summer or ice in winter. The fjord today has oceanic salinity, approximately 30 PSU (or per mille by weight) at all depths. Many animals and maritime plants that can be found in Skagerrak, Kattegat and the North Sea