Editing Lake Constance (section)

== Fishing ==
The lake was frozen in the years 1077 (?), 1326 (partial), 1378 (partial), 1435, 1465 (partial), 1477 (partial), 1491 (partial?), 1517 (partial), 1571 (partial), 1573, 1600 (partial), 1684, 1695, 1709 (partial), 1795, 1830, 1880 (partial), and 1963.

About {{convert|1000|t|ST|lk=on}} of fish were caught by 150 professional fishermen in 2001 which was below the previous ten-year average of {{convert|1200|t|ST}} per year. The Lake Constance [[Brown trout|trout]] (''Salmo trutta'') was almost extinct in the 1980s due to pollution, but thanks to protective measures they have made a significant return. Lake Constance is the home of the critically endangered species of trout ''[[Salvelinus profundus]]'',<ref>[http://www.swissinfo.ch/eng/deep-water-char_-extinct--fish-found-in-lake-constance/42425340 ‘Extinct’ fish found in Lake Constance]</ref> and formerly also the now [[extinct]] Lake Constance whitefish (''[[Coregonus gutturosus]]'').<ref>{{Cite web |url=http://www.bfn.de/0322_rote-liste-wirbeltiere+M52087573ab0.html |title=Red List – Volume 1: Vertebrates (2009) – General assessment for the vertebrate groups |access-date=2012-12-28 |archive-url=https://web.archive.org/web/20130623053516/http://www.bfn.de/0322_rote-liste-wirbeltiere+M52087573ab0.html |archive-date=2013-06-23 |url-status=dead }}</ref>