Department of Marine Biology, Faculty of Marine Sciences, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran.
J Fish Biol. 2020 Oct;97(4):938-952. doi: 10.1111/jfb.14419. Epub 2020 Aug 28.
The present study aimed at assessing the annual reproductive cycle of female Arabian carpetshark, Chiloscyllium arabicum from the Persian Gulf by a macroscopic and microscopic evaluation of the reproductive tract. The annual cycle of gonadal steroids [17β-estradiol (E2), progesterone (P4) and testosterone (T)] was also assessed in this shark. In total, 130 female C. arabicum were collected from the Bahrakan Creek (located northwest of the Persian Gulf) between January 2018 and March 2019. Females were oviparous with an external-type ovary and only one functional ovary. Five sexual maturity stages were recognized based on macroscopic and microscopic evaluation: Immature I (August-October), Immature II (November-January), Mature (February-March), Pregnant (April-May) and Spent (June-July). The structural changes in the oviducts, oviducal glands and uterus throughout the annual reproductive cycle were consistent with their roles in the egg movement, the egg capsule production and sperm storage. The plasma levels of the gonadal steroids were associated with morphological changes in the reproductive tract. E2 showed two detectable peaks during March (close to ovulation) and June (just before mating). P4 and T displayed a peak just before ovulation.
本研究旨在通过对生殖道的宏观和微观评估来评估阿拉伯地毯鲨（Chiloscyllium arabicum）的雌性年度生殖周期。本鲨鱼的性腺类固醇（17β-雌二醇（E2）、孕酮（P4）和睾丸激素（T））的年度周期也进行了评估。总共从 2018 年 1 月至 2019 年 3 月在波斯湾西北部的 Bahrakan Creek 收集了 130 条雌性 C. arabicum。雌性为卵生，具有外生型卵巢，且只有一个功能性卵巢。根据宏观和微观评估，确定了五个性成熟阶段：未成熟 I 期（8 月-10 月）、未成熟 II 期（11 月-1 月）、成熟（2 月-3 月）、怀孕（4 月-5 月）和消耗（6 月-7 月）。输卵管、输卵管腺和子宫在整个年度生殖周期中的结构变化与其在卵子运动、卵胶囊产生和精子储存中的作用一致。性腺类固醇的血浆水平与生殖道的形态变化有关。E2 在 3 月（接近排卵）和 6 月（交配前）出现两个可检测到的峰值。P4 和 T 在排卵前出现一个峰值。
