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題名 | A Microencapsulated Analog of LH-RH Accelerates Maturation But without Stimulating Sex Reversal in the Protandrous Black Porgy, Acanthopagrus Schlegeli=微膠囊化LH-RH類似物加速黑鯛性成熟但並不促進性轉變 |
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作者 | 張清風; 岳文勛; 李孟芳; | 書刊名 | 國立高雄海專學報 |
卷期 | 12 1997.04[民86.04] |
頁次 | 頁91-109 |
分類號 | 387.101 |
關鍵詞 | 黑鯛; 微膠囊化LH-RH類似物; Black porgy; Estradiol-17 β; LH-RH analog; Maturation; Sex reversal; Spermiation; |
語文 | 英文(English) |
中文摘要 | 本實驗之目的為使用微膠囊化 LH-RH 類似物 (D-Trp��-luteinizing hormone-r eleasing hormone analog) 處理繁殖期前之三歲黑鯛, 以調控其生殖與性腺類固醇之分泌 。24 尾雄黑鯛均分為二實驗組,分別為控制組及微囊化 LH-RH 類似物注射組。實驗進行 4 個月, 每隔 1 ∼ 2 週測產精量及採血測 testosterone (T)、 estradiol-17 β (E2) 及 17 α -hydroxyprogesterone (17 α -OH P) 等類固醇激素之變化; 期間並於第 4、10、 12、14 及 16 週測卵徑。實驗結果顯示,微膠囊化 LH-RH 類似物並不促進雄黑鯛性轉變為 雌魚。 微囊化 LH-RH 類似物注射組及控制組中,已性轉變成為雌魚之實驗魚在繁殖期前及 繁殖期間血液內 E2 含量均很高,而未性轉變之雄魚則很低。已性轉變成為雌魚或未性轉變 而仍為雄魚之實驗魚血液中 T 含量測均很低亦很類似,無明顯之差異。 至於 17 α -OH P 之含量在實驗期間各實驗魚均很低。由這些結果顯示,微膠囊化 LH-RH analog 可促使黑鯛 提前於繁殖期前性成熟;而血液 E2 含量似乎與雄性先熟型之黑鯛自然性轉變關係十分密切 。 |
英文摘要 | The objective of this study was to regulate the reproduction and level s of gonadal steroids in 3-year-old protandrous black porgy (Acanthopagrus schlegeli) by treatment with microencapsulated D-Trp �� -luteinizing hormone-releasing hormone (LH-RH analog) during the prespawning season. Twenty-four previously male black porgy were equally divided into 2 groups and injected with vehicle (control group) or with microencapsulated Lh-RH analog (LH-RH analog group) , respectively. Spermiation and plasma levels of testosterone (T). estradiol-17 β (E2) and 17 α -hydroxyprogesterone (17 α -OH P) were measured, after treatment, at intervals of 1-2weeks for 4 months. Oocyte diameters were also measured after 4, 10, 12 14 and 16 weeks of treatment. The Microencapsulated LH-RH analog accelerated the onset of spermiation by least 5 weeks. Oocyte diameters were also significantly increased in the LH-RH analog group. The microencapsulated LH-RH analog did not increase the number of sex-reversing females compared with the number in the control group. High levels of plasma E2 were found in the sex-reversing females in the LH-RH analog and cntrol group during the prespawning and spawning season. Low levels of plasma E2 were observed in the non-reversed males in both the LH-RH analog and the control groups. Similar profiles of plasma T levels were detected in male and in reversing female black porgy in the LH-RH analog and control groups. Plasma 17 α -OH P levels were low and constant throughout the experimental period in fish in each group. These fidings indicate that the microencapsulated LH-RH analog accelerted gonadal maturation in the black porgy during the prespawning season. Plasma levels of E2 seem to be closely related to the occurrence of natural sex reversal in the protandrous black porgy, A schlegeli. |
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