Oklahoma Department of Wildlife Conservation, Jenks, Oklahoma, USA.
Montana Fish, Wildlife & Parks, Great Falls, Montana, USA.
J Fish Biol. 2020 Sep;97(3):919-925. doi: 10.1111/jfb.14442. Epub 2020 Jul 27.
This study reports the first cases of intersex (abnormal development of both male and female reproductive tissues in a gonad) paddlefish Polyodon spathula, an Acipenseriform species of large rivers in the central U.S. and in aquaculture worldwide. Despite a large, multi-decadal data set in Oklahoma, Montana, and North Dakota, intersex development was not observed until 2019, when two individuals were harvested from the Grand Lake/Neosho River stock in Oklahoma. This suggests that intersex development in mid-water, zooplanktivorous paddlefish is rarer than in bottom-dwelling sturgeons for which intersex development is regularly observed. Although contaminants are implicated in causing intersex development in other Acipenseriformes, more investigation is needed.
本研究报告了首例雌雄同体（性腺中同时存在雄性和雌性生殖组织的异常发育）匙吻鲟 Polyodon spathula 的病例，匙吻鲟是美国中部和全球水产养殖中一种鲟形目物种。尽管在美国俄克拉荷马州、蒙大拿州和北达科他州有一个大型的、几十年的数据集，但直到 2019 年，在俄克拉荷马州的大湖/尼奥肖河种群中收获了两个个体时，才观察到雌雄同体的发育。这表明，在中层、以浮游动物为食的匙吻鲟中，雌雄同体的发育比经常观察到的底栖鲟类更为罕见。虽然其他鲟形目动物的雌雄同体发育与污染物有关，但还需要更多的研究。
