Neves, A.Gordo, I.Sequeira, V.Vieira, A.R.Silva, E.Silva, F.Duarte, A.M.Mendes, S.Ganhão, R.Peleteiro, M.C.Assis, C.Rebelo, R.Magalhães, M.F.Gil, M. M.Gordo, L.S.2021-08-202021-08-202020Neves A, Gordo I, Sequeira V, Vieira AR, Silva E, Silva F, Duarte AM, Mendes S, Ganhão R, Peleteiro MC, Assis C, Rebelo R, Magalhães MF, Gil MM, Gordo LS. Negative impact on the reproductive potential of blue jack mackerel Trachurus picturatus by Kudoa infection of the ovary. Dis Aquat Organ. 2020 Sep 17;141:47-52. doi: 10.3354/dao03515. PMID: 32940250.0177-51031616-1580http://hdl.handle.net/10400.8/6125This study was partially supported by the European Maritime and Fisheries Fund MAR2020 project ‘VALOREJET: Valorização de espécies rejeitadas e de baixo valor comercial’, MAR-01.03.01-FEAMP-0003 and by Fundação para a Ciência e Tecnologia through research contracts attributed to V.S. (CEECIND/02705/2017) and A.R.V. (CEECIND/01528/2017), and strategic project UID/MAR/ 04292/2019.Reproduction of Trachurus picturatus off the western Portuguese coast was studied over 1 yr. During histological analyses, the presence of Kudoa sp. was detected in advanced vitellogenic oocytes. Kudoa infections are known to cause economic loss through the induction of postmortem liquefaction of fish muscles, but ovarian infection as reported in this study will seriously affect the reproductive potential of the species and thus impact fisheries productivity. Only females showed gonad infection which led to total degradation of advanced vitellogenic oocytes. No macroscopic, somatic or condition indices revealed differences between infected and uninfected females, rendering this infection event a concealed suppression of reproduction.engKudoaStock reproductive potentialSuppressed reproductionOvaryjournal article10.3354/dao03515