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Atresia in the Chilean Jack Mackerel Trachurus murphyi Nichols, 1920 : implication for reproductive dynamics

Abstract : The Chilean jack mackerel Trachurus murphyi support an important fishery in the South-eastern Pacific Ocean which has declined considerably over time. In this thesis, morphology of atretic oocytes in T. murphyi as well, patterns of prevalence and intensity of atresia were described. The stages of atresia identified were alpha, beta and gamma. General linear models showed that incidence of postovulatory follicles, sea surface temperature and month/year, explain the prevalence and intensity of atresia. Dynamics of alpha and beta-atresia could be considered a potential proxy for any disruption of spawning season and the end of spawning season. This is the first assessment comparing fecundity between atretic and not atretic females.The batch fecundity and relative fecundity were lowest compared with other species of Trachurus. In T. murphyi, the transcriptomic database (liver and ovary tissue) was generated. The results show a set of core potential genes as markers for atresia as fatty acid-binding protein (FABP) genes and follistatin. The transcriptomic analysis demonstrated the expression of genes associated to protozoan infection. All liver of T. murphyi were parasitized by Goussia cruciate (Apicomplexa), the abundance of the parasite was negative correlated with the host total length. A potential relationship between protozoan infection and atresia cannot be established.
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Paola Alejandra Gonzalez Kother. Atresia in the Chilean Jack Mackerel Trachurus murphyi Nichols, 1920 : implication for reproductive dynamics. Reproductive Biology. Université de Bretagne occidentale - Brest; Universidad de Antofagasta (Chili), 2019. English. ⟨NNT : 2019BRES0050⟩. ⟨tel-02469393⟩

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