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Submersible broadband acoustic probes are often used for precise target measurements due to increased range resolution and the possibility to use higher frequencies with expanded spectra; however, broadband measurements can introduce undesired signals into the data. Using an unsupervised outlier detection approach, we enhanced the selectivity of broadband acoustic targets of mesopelagic fish in the Labrador Sea. We observed high variability in frequency response within insonified volumes and echo-traces. Applying an outlier detection algorithm, we filtered anomalous signals, improving density estimates by reducing positive skew up to 35%. Our approach increases measurement precision and provides insight into broadband echosounder applications for mesopelagic fish assessments.<\/jats:p>","DOI":"10.1121\/10.0039933","type":"journal-article","created":{"date-parts":[[2025,11,19]],"date-time":"2025-11-19T13:32:42Z","timestamp":1763559162000},"page":"3994-4006","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Unsupervised classification increases precision in acoustic broadband target strength measurements of mesopelagic fish"],"prefix":"10.1121","volume":"158","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5107-2037","authenticated-orcid":false,"given":"Julek","family":"Chawarski","sequence":"first","affiliation":[{"name":"Centre for Fisheries Ecosystems Research, Marine Institute of Memorial University of Newfoundland and Labrador 1 , St. John's, Newfoundland and Labrador,","place":["Canada"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Cot\u00e9","sequence":"additional","affiliation":[{"name":"Fisheries and Oceans Canada, Northwest Atlantic Fisheries Centre 2 , St. John's, Newfoundland and Labrador,","place":["Canada"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maxime","family":"Geoffroy","sequence":"additional","affiliation":[{"name":"Centre for Fisheries Ecosystems Research, Marine Institute of Memorial University of Newfoundland and Labrador 1 , St. John's, Newfoundland and Labrador,","place":["Canada"]},{"name":"Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway 3 , N-9037 Troms\u00f8,","place":["Norway"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"231","published-online":{"date-parts":[[2025,11,19]]},"reference":[{"key":"2025112008413582900_c1","doi-asserted-by":"publisher","first-page":"2907","DOI":"10.1093\/icesjms\/fsab167","article-title":"Application of an unsupervised clustering algorithm on in situ broadband acoustic data to identify different mesopelagic target types","volume":"78","year":"2021","journal-title":"ICES J. 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