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Diseases of Aquatic Organisms

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DAO 141:47-52 (2020)  -  DOI: https://doi.org/10.3354/dao03515

NOTE
Negative impact on the reproductive potential of blue jack mackerel Trachurus picturatus by Kudoa infection of the ovary

A. Neves1,2,*, I. Gordo3, V. Sequeira1,2, A. R. Vieira1,2, E. Silva1, F. Silva1,2, A. M. Duarte2,4, S. Mendes2,4, R. Ganhão2,4, M. C. Peleteiro5, C. Assis1,2, R. Rebelo1,6, M. F. Magalhães1,6, M. M. Gil2,4, L. S. Gordo1,2

1Faculdade de Ciências, Universidade de Lisboa, Bloco C2, Campo Grande, 1749-016 Lisboa, Portugal
2MARE - Marine and Environmental Sciences Centre, Rua Ernesto de Vasconcelos, Campo Grande, 1749-016 Lisboa, Portugal
3Pride Veterinary Centre, Riverside Rd, Derby DE24 8HX, UK
4Instituto Politécnico de Leiria, Edifício Cetemares, Av. Porto de Pesca, 2520-630 Peniche, Portugal
5CIISA, Interdisciplinary Centre of Research in Animal Health, Faculdade de Medicina Veterinária, Universidade de Lisboa, Av. da Universidade Técnica, 1300-477 Lisboa, Portugal
6CE3C - Centre for Ecology, Evolution and Environmental Changes, Rua Ernesto de Vasconcelos, Campo Grande, 1749-016 Lisboa, Portugal
*Corresponding author:

ABSTRACT: 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 post-mortem 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.


KEY WORDS: Kudoa · Stock reproductive potential · Suppressed reproduction · Ovary degradation


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Cite this article as: Neves A, Gordo I, Sequeira V, Vieira AR and others (2020) Negative impact on the reproductive potential of blue jack mackerel Trachurus picturatus by Kudoa infection of the ovary. Dis Aquat Org 141:47-52. https://doi.org/10.3354/dao03515

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