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However, in the case of Automated Information Systems (AIS), attached to vessels, observed strange behaviors in the tracking datasets may come from intentional manipulation of the electronic devices. Thus, the analysis of anomalies can provide valuable information on suspicious behavior. Here, we analyze anomalies of fishing vessel trajectories obtained with the Automatic Identification System. The map of silent anomalies, those that occur when positioning data are absent for more than 24 hours, shows that they are most likely to occur closer to land, with 87.1% of anomalies observed within 100\u00a0km of the coast. This behavior suggests the potential of identifying silence anomalies as a proxy for illegal activities. With the increasing availability of high-resolution positioning of vessels and the development of powerful statistical analytical tools, we provide hints on the automatic detection of illegal activities that may help optimize the management of fishing resources.<\/jats:p>","DOI":"10.1140\/epjds\/s13688-024-00459-0","type":"journal-article","created":{"date-parts":[[2024,3,21]],"date-time":"2024-03-21T09:01:34Z","timestamp":1711011694000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Identification of suspicious behavior through anomalies in the tracking data of fishing vessels"],"prefix":"10.1140","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6593-5032","authenticated-orcid":false,"given":"Jorge P.","family":"Rodr\u00edguez","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xabier","family":"Irigoien","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carlos M.","family":"Duarte","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"V\u00edctor M.","family":"Egu\u00edluz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,3,21]]},"reference":[{"issue":"4","key":"459_CR1","doi-asserted-by":"publisher","first-page":"317","DOI":"10.1046\/j.1467-2979.2002.00093.x","volume":"3","author":"TJ Pitcher","year":"2002","unstructured":"Pitcher TJ, Watson R, Forrest R, Valty\u0300sson H, Gu\u00e9nette S (2002) Estimating illegal and unreported catches from marine ecosystems: a basis for change. 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