Abstract: The paper first reported the investigative results of some serum reproductive hormones on Neophocaena phocaenoides from Yangtze River during March and April. The serum testosterone levels from tested sexual active matured male animals were between 2.64 ng/m l and 9.40 ng/m l. The est radio l cou ld no t be found out from immature female animals dolph in sand could be found out from mature female animals. The serum progesterone levels in pregnant female dolphins may reach as high as 30.59 ng/ml

Key words: Neophocaena phocaenoides, Serum reproductive hormone, Testosterone, Progesterone and estradiol

摘要： 本文首次报道了3～ 4月份长江江豚(Neop hocaena phocaenoides) 某些血清生殖激素的研究结果。性成熟雄性江豚血清睾酮浓度在2.64 ng/ml和9.40 ng/ml之间波动。雌性未成熟个体不能测出血清雌二醇, 性成熟个体均能测出血清雌二醇, 妊娠个体血清孕酮浓度可达30.59ng/ml 以上。

关键词: 江豚, 血清生殖激素, 睾酮, 孕酮和雌二醇