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The histological section of the ovary of a M. tengara during the late spawning phase (August) showing all of the previtellogenic oocytic stages [Oo: oogonia, Epo: early perinucleolar oocyte, and Lpo: late perinucleolar oocyte] with few apoptotic follicles (af) that are gradually merging with the ovarian stroma when the tissues are treated with ZnS nanoparticles at the concentration of 500 μg/L [IA: Iron-Alum Haematoxylin].
