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首页> 外文期刊>Fish Physiology and Biochemistry >Changes in the immunostaining intensities of follicle-stimulating hormone and luteinizing hormone during ovarian maturation in the female Japanese flounder
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Changes in the immunostaining intensities of follicle-stimulating hormone and luteinizing hormone during ovarian maturation in the female Japanese flounder

机译：雌性比目鱼卵巢成熟过程中促卵泡激素和黄体生成素的免疫染色强度的变化

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摘要

The role of gonadotropin (GTH) in the reproduction of the Japanese flounder, Paralichthys olivaceus, was studied by assessing the changes in the apparent activity of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in the pituitary gland during gonadal maturation by immunohistochemical analyses. Corresponding changes in plasma levels of testosterone (T), estradiol-17β (E2), and 17α,20β-dihydroxy-4–pregnen-3-one (DHP) were also studied. Reared fish at the early spawning to termination stages were sampled from May to August and wild fish at the previtellogenic to termination stages were caught at 3- to 4-week intervals between April and September offshore from the northern mainland of Japan by gill nets. The gonadosomatic index of the reared fish decreased from the early spawning stage to the termination stage, while that of the wild fish increased significantly from the previtellogenic stage to the early spawning stage and decreased thereafter. In the reared fish, the immunostaining intensities of FSH and LH were high during the spawning period, accompanied by high plasma levels of T, E2, and DHP. In the wild fish, the immunostaining intensities of FSH and LH were low during the previtellogenic stage but increased during the maturing and spawning stages. These results indicate that both FSH and LH are likely associated with oocyte maturation in the Japanese flounder.
机译：通过评估性腺成熟过程中垂体腺中促卵泡激素（FSH）和促黄体生成激素（LH）的表观活性的变化，研究了促性腺激素（GTH）在日本比目鱼oliparaeus繁殖中的作用。免疫组织化学分析。还研究了血浆中睾丸激素（T），雌二醇-17β（E2 ）和17α，20β-二羟基-4-孕烯-3-酮（DHP）的水平变化。在5月至8月对产卵早期至终止阶段的养殖鱼进行取样，并在4月至9月之间以g鱼网捕捞3至4周间隔的前成卵至终止阶段的野生鱼。从产卵早期到终止阶段，养殖鱼的性腺体指数降低，而从产卵前阶段到产卵早期，野生鱼的性腺体指数显着增加，此后降低。在养殖的鱼中，产卵期间FSH和LH的免疫染色强度较高，同时血浆中的T，E2 和DHP水平较高。在野生鱼中，卵生前的阶段FSH和LH的免疫染色强度较低，而在成熟和产卵阶段则增加。这些结果表明FSH和LH可能与日本比目鱼的卵母细胞成熟有关。

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