• Title/Summary/Keyword: 난경

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Histological Description of Oogenesis in Largehead Hairtail Trichiurus lepturus (Teleostei: Trichiuridae) (갈치 Trichiurus lepturus 난자형성과정의 조직학적 기재)

  • Shin, So Ryung;Kim, Hyeon Jin;Oh, Han Young;Kim, Jae Won;Lee, Jung Sick
    • Journal of Marine Life Science
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    • v.7 no.1
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    • pp.55-59
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    • 2022

  • This study was conducted to provide basic information on the sexual mature and reproductive biology of Trichiurus lepturus. During the oogenesis, size of oocyte and nucleus showed the increase tendency but size ratio of nucleolus to nucleus was decreased. In the result of H-E stain, the stainability of the cytoplasm was changed from basophilic to eosinophilic. The egg diameter of initial vitellogenic oocyte was about 63.2 (±12.7) ㎛. In the cytoplasmic cortex, eosinophilic yolk nucleus was observed. The size of mature oocyte was 216.6 (±24.7) ㎛ and GVBD (germinal vesicle breakdown) was observed. The size of ripe oocyte was 317.9 (±80.9) ㎛ and the thickness of zona radiata was 4.2 (±1.7) ㎛. The oocyte developmental type is considered to belong to the group synchronous type. The accumulation of yolk in the oocyte, like most teleost, is thought to be of two types: exogenous and endogenous accumulation.

  • https://doi.org/10.23005/ksmls.2022.7.1.55 인용 PDF KSCI HTML

Effects of Nonylphenol and 2,2',4,6,6'-Pentachlorobiphenyl on In Vitro Steroidogenesis in Maturing Oocytes of Ribbed Gunnel, Dictyosoma burgeri (그물베도라치, Dictyosoma burgeri의 성숙기 난모세포 스테로이드 대사에 미치는 Nonylphenol과 2,2',4,6,6'-Pentachlorobiphenyl의 효과)

  • Hwang, In-Joon;Baek, Hea-Ja
    • Development and Reproduction
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    • v.14 no.2
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    • pp.115-121
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    • 2010

  • The in vitro effects of nonylphenol (NP) and 2,2',4,6,6'-pentachlorobiphenyl (PCB104) on ovarian steroidogenesis of the ribbed gunnel, Dictyosoma burgeri were investigated. Oocytes taken during maturation stage were incubated with 100 ng/$m{\ell}$ of NP and PCB104 in the presence of exogenous precursor, $[^3H]-17{\alpha}$-hydroxyprogesterone ($[^3H]-17{\alpha}OHP$). Steroids were extracted from the media and the isolated oocytes, and the extracts were separated and identified by thin layer chromatography. The identities of the major metabolites were testosterone (T) and estradiol-$17{\beta}$ (E2). NP treatment inhibited production of E2 metabolite in the oocytes of 1.2, 1.3 and 1.4 mm although NP inhibited production of T metabolite at the oocytes of 1.1, 1.3 and 1.4 mm. PCB104 treatment inhibited production of T metabolite in the oocytes of all groups and E2 metabolite in the oocytes of 1.2, 1.3 and 1.4 mm. In conclusion, these results suggested that NP and PCB104 had an inhibitory effects on conversion of $[^3H]-17{\alpha}OHP$ to T and E2 during the oocyte maturation process of ribbed gunnel.

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