This study evaluated how the plasma steroid hormones testosterone (T) and 17β-estradiol (E₂) are related to follicular development in regenerating females of the cururu stingray, Potamotrygon wallacei, during the rising water season of the middle Rio Negro basin. The relative weight of hepatic and ovarian tissues, as well as the morphological changes in the vitellogenic follicles, were related to the increase in the water level. Correlations between the maximum follicular diameter (MFD) and E₂ and T levels suggest a concomitant action of these steroids in controlling follicular growth. These associations support the idea that the reproduction of this species is synchronous with the local hydrological cycle of the middle Rio Negro basin.

本研究评估了血浆类固醇激素睾酮 (T) 和 17β-雌二醇 (E ₂ ) 如何与内格罗河中部盆地上升水季期间黄貂鱼 ( Potamotrygon wallacei) 的再生雌性的卵泡发育相关。肝脏和卵巢组织的相对重量以及卵黄卵泡的形态变化与水位的增加有关。最大卵泡直径 (MFD) 与 E ₂之间的相关性和 T 水平表明这些类固醇在控制卵泡生长方面的伴随作用。这些关联支持该物种的繁殖与内格罗河盆地中部的当地水文循环同步的观点。