Sang Huynh Minh, Lam Ho Son, Hy Le Ho Khanh, Ky Pham Xuan, Minh-Thu Phan
Institute of Oceanography, Vietnam Academy of Science and Technology, 01- Cau Da, Nha Trang 650000, Vietnam.
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi 100000, Vietnam.
Animals (Basel). 2019 Nov 1;9(11):889. doi: 10.3390/ani9110889.
This study aimed to document the seasonal cycle of steroid levels in the plasma and ovary, including testosterone (T), estradiol-17β (E) and 17α, 20β-dihydroxy-4-pregnen-3-one (DHP) in relation to ovarian development in wild populations of female blue tang fish. The gonadosomatic index (GSI%) maintained high values from April to July and increased from the II to IV ovarian stages and dropped in the V stage. Levels of plasma, ovary T and E and DHP were high from March to July. Plasma T and E levels were low in the II stage when most oocytes were previtellogenic, reaching a peak during spawning, and decreased in the V stages when fish were going to late spawning and termination. DHP was detected in all stages of the ovary with a higher level in spawning fish but decreased after spawning. These results revealed that T, E and DHP could be involved in ovarian development and DHP may play a significant role as a maturational inducing hormone in blue tang fish.
本研究旨在记录雌性蓝唐鱼野生种群中血浆和卵巢中类固醇水平的季节性周期，包括睾酮（T）、雌二醇-17β（E）和17α,20β-二羟基-4-孕烯-3-酮（DHP），并探讨其与卵巢发育的关系。性腺指数（GSI%）在4月至7月维持较高水平，从卵巢Ⅱ期到Ⅳ期增加，在Ⅴ期下降。血浆、卵巢T、E和DHP水平在3月至7月较高。血浆T和E水平在Ⅱ期较低，此时大多数卵母细胞处于卵黄发生前期，在产卵期间达到峰值，并在Ⅴ期下降，此时鱼类即将进入晚期产卵和终止阶段。在卵巢的所有阶段均检测到DHP，产卵鱼中的水平较高，但产卵后下降。这些结果表明，T、E和DHP可能参与卵巢发育，DHP可能作为蓝唐鱼的成熟诱导激素发挥重要作用。
