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Disrupted biorhythms can impair the immune system of vertebrates as it has been shown for conditions with continuous illumination or long\u2010day photoperiod in many vertebrates, including fish. Nonetheless, this has not been shown so far for typical ALAN scenarios with high light intensities during day and low light intensities at night. Therefore, in this study, proxies for the innate immune system and oxidative stress as well as body indices of Eurasian perch <jats:italic>Perca fluviatilis<\/jats:italic> were measured under a wide range of intensities of nocturnal illumination. The authors found no changes in parameters of the innate immune system and no significant changes in proxies for oxidative stress after 2\u2010week exposures to nocturnal illuminance ranging from 0.01\u2009lx to 1\u2009lx in one experiment or from 1\u2009lx to 100\u2009lx in a second experiment. A decrease in the hepato\u2010somatic index at the highest tested light intensity of 100\u2009lx compared to the dark control was the only significant difference in all parameters among treatments. After 2\u2009weeks of exposure, ALAN does not seem to seriously challenge the innate immune system and seems to cause less oxidative stress than expected. The results of this study contradict the findings from other studies applying continuous illumination or long\u2010day photoperiod and highlight the importance of further research in this field. Because ALAN represents a sustained modulation of the environment that may have cumulative effects over time, long\u2010term studies are required for a better understanding of how ALAN modulates the health of fish.<\/jats:p>","DOI":"10.1111\/jfb.14703","type":"journal-article","created":{"date-parts":[[2021,2,15]],"date-time":"2021-02-15T15:58:29Z","timestamp":1613404709000},"page":"118-130","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Innate immunity, oxidative stress and body indices of Eurasian perch <i>Perca fluviatilis<\/i> after two\u2009weeks of exposure to artificial light at night"],"prefix":"10.1111","volume":"99","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4693-2992","authenticated-orcid":false,"given":"Franziska","family":"Kupprat","sequence":"first","affiliation":[{"name":"Leibniz\u2010Institute of Freshwater Ecology and Inland Fisheries (IGB)  Berlin Germany"},{"name":"Faculty of Life Sciences Humboldt University  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5932-266X","authenticated-orcid":false,"given":"Franz","family":"H\u00f6lker","sequence":"additional","affiliation":[{"name":"Leibniz\u2010Institute of Freshwater Ecology and Inland Fisheries (IGB)  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9401-8145","authenticated-orcid":false,"given":"Klaus","family":"Knopf","sequence":"additional","affiliation":[{"name":"Leibniz\u2010Institute of Freshwater Ecology and Inland Fisheries (IGB)  Berlin Germany"},{"name":"Faculty of Life Sciences Humboldt University  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6198-0979","authenticated-orcid":false,"given":"Torsten","family":"Preuer","sequence":"additional","affiliation":[{"name":"Leibniz\u2010Institute of Freshwater Ecology and Inland Fisheries (IGB)  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8905-183X","authenticated-orcid":false,"given":"Werner","family":"Kloas","sequence":"additional","affiliation":[{"name":"Leibniz\u2010Institute of Freshwater Ecology and Inland Fisheries (IGB)  Berlin Germany"},{"name":"Faculty of Life Sciences Humboldt University  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,3,2]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.fsi.2016.08.003"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0076-6879(84)05016-3"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.fsi.2008.03.017"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10695\u2010017\u20100408\u20106"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2014.12.094"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00027\u2010010\u20100167\u20102"},{"issue":"5","key":"e_1_2_8_8_1","first-page":"240","article-title":"Non\u2010specific defence mechanisms of rainbow trout (Oncorhynchus mykiss) during artificial photoperiod","volume":"24","author":"Burgos A.","year":"2004","journal-title":"Bulletin of the European Association of Fish Pathologists"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/0042\u20106989(82)90223\u20101"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.3390\/ijms14048638"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1095\u20108649.1995.tb06002.x"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1096\u20104959(00)00299\u20102"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/jfb.13651"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600\u2010079X.2008.00557.x"},{"key":"e_1_2_8_15_1","first-page":"101","volume-title":"Techniques in fish Immuology","author":"Ellis A. 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