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Wet mounts from ovarian biopsies of greater amberjack Seriola dumerili sampled at the onset of the spawning season. (a) Fully vitellogenic oocytes (vg) with dark ooplasm and distinct zona radiata (zr). (b) Vitellogenic oocytes undergoing advanced follicular atresia (at) having a lighter ooplasm and no apparent zr. Magnification bars = 500 μm
