This dataset has been extracted as part of an exercise to assemble "all" Cefas
Temperature Data and publish it in a Data paper. It is one of 17 Cefas data
sources assembled. Electronic tags that record temperature and depth were
attached to, or implanted into, cod caught in the southern North Sea between
1999 and 2009 (for methods see Neat et al., 2014). Data from tags that were
returned from recaptured cod were downloaded and the depth time series was
used to estimate daily geographic location.