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Four groups of hatchery\u2010produced pejerrey larvae were stocked in floating cages in La Salada de Monasterio lake (Pampas region), a natural habitat of this species, and reared from hatching beyond gonadal sex determination with minimum human interference. Cage 1 was stocked at the beginning of the spring spawning season and the other cages were stocked with monthly delays until cage 4 in early summer. The genotypic (<jats:italic>amhy+<\/jats:italic>, XY\/YY; <jats:italic>amhy\u2212<\/jats:italic>, XX) and phenotypic (testis, male; ovary, female) sex ratios and proportions of genotype\/phenotype mismatched individuals were estimated and their relation to water temperature and daylength during the experiment was analysed by generalized linear modelling. Water temperature varied between 11 and 30.5\u00b0C, and daylength duration between 11\u2009h 22\u2009min and 14\u2009h 35\u2009min. Sex genotyping revealed nearly balanced sex ratios of XY\/YY (46%\u201349.1%) and XX (50.9%\u201354%) fish in cages 2\u20134 whereas the genotypic sex ratio in cage 1 was clearly biased towards XY\/YY fish (60.6%). Phenotypic males ranged from 42% to 54.4% in cages 1\u20133. Cage 4, in turn, had significantly more phenotypic males (66%). The percentage of XX males (phenotypic male\/genotypic female) was 23.1% in cage 1, decreased to a minimum of 5.4% in cage 2 and gradually increased in cages 3 and 4 to a maximum of 40.7% in the latter. The percentages of XY\/YY females (phenotypic female\/genotypic male) were highest in cage 1 (30%) and decreased progressively in the other cages to a significantly lower value (4.3%) in cage 4. These results generally support the findings of laboratory studies on the effect of temperature on the sex determination of this species and also provide novel evidence of a XX genotype\u2010specific masculinizing effect of short daylength.<\/jats:p>","DOI":"10.1111\/jfb.15241","type":"journal-article","created":{"date-parts":[[2022,10,11]],"date-time":"2022-10-11T08:38:30Z","timestamp":1665477510000},"page":"75-82","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Sex reversal of pejerrey (<i>Odontesthes bonariensis<\/i>), a species with temperature\u2010dependent sex determination, in a seminatural environment"],"prefix":"10.1111","volume":"102","author":[{"given":"Pamela S.","family":"del Fresno","sequence":"first","affiliation":[{"name":"Laboratorio de Ictiofisiolog\u00eda y Acuicultura Instituto Tecnol\u00f3gico de Chascom\u00fas (CONICET\u2010UNSAM) Escuela de Bio y Nanotecnolog\u00edas (UNSAM)  Buenos Aires Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Javier R.","family":"Garcia de Souza","sequence":"additional","affiliation":[{"name":"Instituto de Limnolog\u00eda \u201cDr. Ra\u00fal A. Ringuelet\u201d ILPLA\u2010(CONICET\u2010UNLP)  Buenos Aires Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dar\u00edo C.","family":"Colautti","sequence":"additional","affiliation":[{"name":"Instituto de Limnolog\u00eda \u201cDr. Ra\u00fal A. Ringuelet\u201d ILPLA\u2010(CONICET\u2010UNLP)  Buenos Aires Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoji","family":"Yamamoto","sequence":"additional","affiliation":[{"name":"Graduate School of Marine Science and Technology Tokyo University of Marine Science and Technology  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masashi","family":"Yokota","sequence":"additional","affiliation":[{"name":"Graduate School of Marine Science and Technology Tokyo University of Marine Science and Technology  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carlos A.","family":"Str\u00fcssmann","sequence":"additional","affiliation":[{"name":"Graduate School of Marine Science and Technology Tokyo University of Marine Science and Technology  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8572-0677","authenticated-orcid":false,"given":"Leandro A.","family":"Miranda","sequence":"additional","affiliation":[{"name":"Laboratorio de Ictiofisiolog\u00eda y Acuicultura Instituto Tecnol\u00f3gico de Chascom\u00fas (CONICET\u2010UNSAM) Escuela de Bio y Nanotecnolog\u00edas (UNSAM)  Buenos Aires Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2022,10,28]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1159\/000452362"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cbpa.2008.11.018"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jembe.2014.07.009"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1590\/S1679-62252011005000040"},{"key":"e_1_2_11_6_1","first-page":"11","volume-title":"Temperature\u2010dependent sex determination in vertebrates","author":"Conover D. 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