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Effects of GnRH-a on the ovarian maturation of blue tang fish (Paracanthurus hepatus Linnaeus, 1776)

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Title Effects of GnRH-a on the ovarian maturation of blue tang fish (Paracanthurus hepatus Linnaeus, 1776)
 
Creator Sang, H M
Lam, H S
Ky, P X
 
Subject Blue tang female
GnRH-a
Ovarian maturation
Plasma and ovarian steroids
 
Description 249-254
The effects of gonadotropin-releasing hormone – analogue (GnRH-a) injection on the ovarian maturation and steroid
hormone level of blue tang (Paracanthurus hepatus) females were investigated. Pre-matured blue tang females were
injected with GnRH-a at dosages of 150, 200 and 250 μg/kg body weight and were then observed for fluctuation of steroid
hormone levels, including testosterone (T), estradiol (E2) and 17α,20β-dihydroxy-4-pregnen-3-one (DHP) in plasma and
ovary after 2 and 7 days. Plasma T level was not significantly different among the treated groups at sampling times.
However, the ovarian T levels in the fish injected with 200 and 250 μg/kg GnRH-a were higher than that of the nonadministered
GnRH-a and fish injected with 150 μg/kg after two days (P < 0.05). After seven days of the administration, the
ovarian T level was lowest in the fish without GnRH-a injection and highest in the fish injected with 250 μg/kg (P < 0.05).
The plasma and ovarian E2 levels were higher (P < 0.05) in the fish injected with 200 and 250 μg/kg of GnRH-a than in the
control fish after 2 and 7 days of injection. Both the plasma and ovarian DHP levels in GnRH-a injected fish were
significantly (P < 0.05) increased after day 2 and was highest in the fish injected with 250 μg/kg (P < 0.05). After 7 days
of injection, the plasma and ovarian DHP levels remained higher in the GnRH-a injected fish than in the controlled group
(P < 0.05). There was no difference in DHP levels among the GnRH-a-treated groups. The results indicate that the dosage of
200 μg/kg of GnRH-a is appropriate for inducing maturation of the blue tang fish.
 
Date 2022-07-12T07:28:45Z
2022-07-12T07:28:45Z
2022-03
 
Type Article
 
Identifier 2582-6727 (Online); 2582-6506 (Print)
http://nopr.niscpr.res.in/handle/123456789/60100
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJMS Vol.51(03) [March 2022]