Effect of Postmanufacturing Processing and Shipping of Luteinizing Hormone Releasing Hormone Analog on Induced Ovulation for Production of Channel Catfish Female × Blue Catfish Male Hybrid Fry

2009 ◽  
Vol 71 (4) ◽  
pp. 307-311 ◽  
Author(s):  
Anang H. Kristanto ◽  
Gloria Umali ◽  
Renee Beam ◽  
Rex A. Dunham
Keyword(s):  
Luteinizing Hormone ◽  
Channel Catfish ◽  
Blue Catfish ◽  
Luteinizing Hormone Releasing Hormone ◽  
Releasing Hormone ◽  
Induced Ovulation ◽  
Hormone Analog ◽  
Male Hybrid

Plasma gonadotropin, 17β-estradiol, and 17α,20β-dihydroxy-4-pregnen-3-one levels during luteinizing hormone-releasing hormone analogue and gonadotropin induced ovulation in coho salmon (Oncorhynchus kisutch)

1985 ◽  
Vol 63 (4) ◽  
pp. 824-833 ◽  
Author(s):  
Glen Van Der Kraak ◽  
Helen M. Dye ◽  
Edward M. Donaldson ◽  
George A. Hunter
Keyword(s):  
Luteinizing Hormone ◽  
Coho Salmon ◽  
Effective Means ◽  
Rate Of Change ◽  
Luteinizing Hormone Releasing Hormone ◽  
Releasing Hormone ◽  
Induced Ovulation ◽  
Rate Of Increase ◽  
17Β Estradiol ◽  
Estradiol Levels

Intraperitoneal injections of des Gly10-(D-Ala6) luteinizing hormone-releasing hormone ethylamide (LH-RHA DAla6) alone and in combination with partially purified chinook salmon gonadotropin (SG-G100) were shown to be highly effective means of inducing ovulation in coho salmon. Two injections of LH-RHA DAla6 72 h apart or LH-RHA DAla6 injected with or 72 h following an injection of SG-G100 induced ovulation in 6–10 days. The induction of ovulation was associated with the duration rather than the initial magnitude of the increase in plasma gonadotropin levels. Plasma 17β-estradiol levels decreased whereas plasma 17α,20β-dihydroxy-4-pregnen-3-one (17α20βP) levels increased in response to elevated plasma gonadotropin levels. The time of ovulation was related to the magnitude and rate of change in plasma 17β-estradiol and 17α20βP levels. Ovulation occurred following a reduction of plasma 17β-estradiol levels to less than 2 ng/mL and this decline preceded or was concomitant with an increase in plasma 17αt20βP levels to 450–500 ng/mL. 17α20βP levels in fish which underwent oocyte maturation but not ovulation were lower (100 ng/mL), suggesting that high levels of 17α20βP may have a direct role in ovulation. Changes in 17β-estradiol production appear to determine the time of ovulation by influencing the magnitude and rate of increase of plasma 17α20βP levels.

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