Optimal combination of temperature and photoperiod for sex steroid hormone secretion and egg development of Oreochromis niloticus as determined by response surface methodology

2021 ◽  
Vol 97 ◽  
pp. 102889
Author(s):  
Jun Qiang ◽  
Jie He ◽  
Jun-Hao Zhu ◽  
Yi-Fan Tao ◽  
Jin-Wen Bao ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Oreochromis Niloticus ◽  
Steroid Hormone ◽  
Hormone Secretion ◽  
Optimal Combination ◽  
Sex Steroid ◽  
Egg Development ◽  
Sex Steroid Hormone

Sex steroid hormone secretion in the wall lizardPodarcis siculatestis: The involvement of VIP

2015 ◽  
Vol 323 (10) ◽  
pp. 714-721 ◽  
Author(s):  
Luigi Rosati ◽  
Marina Prisco ◽  
Maria Maddalena Di Fiore ◽  
Alessandra Santillo ◽  
Rosaria Sciarrillo ◽  
...  
Keyword(s):  
Steroid Hormone ◽  
Hormone Secretion ◽  
Sex Steroid ◽  
Sex Steroid Hormone

Effect of methomyl on sex steroid hormone and vitellogenin levels in serum of male tilapia (Oreochromis niloticus ) and recovery pattern

2017 ◽  
Vol 32 (7) ◽  
pp. 1869-1877 ◽  
Author(s):  
Shun-Long Meng ◽  
Li-Ping Qiu ◽  
Geng-Dong Hu ◽  
Li-Min Fan ◽  
Chao Song ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Steroid Hormone ◽  
Sex Steroid ◽  
Sex Steroid Hormone ◽  
Recovery Pattern

scholarly journals Response of Sex Steroid Hormone Synthesis Substrates in Serum and Testes of Male Tilapia (Oreochromis niloticus) Exposed to Methomyl and Its Recovery Pattern

2021 ◽  
Vol 11 (22) ◽  
pp. 10997
Author(s):  
Shunlong Meng ◽  
Xi Chen ◽  
Chao Song ◽  
Limin Fan ◽  
Liping Qiu ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Steroid Hormone ◽  
Free Water ◽  
Sex Steroid ◽  
Toxicity Tests ◽  
Contact Toxicity ◽  
Irreversible Damage ◽  
Sex Steroid Hormone ◽  
Hormone Synthesis ◽  
Reference Threshold

The response of synthetic substrates of sex steroid hormones—cholesterol (CHO), pregnenolone (PREG), and progesterone (PROG)—in the serum and testes of male tilapia (Oreochromis niloticus) to the environmental estrogen pesticide methomyl (0.2, 2, 20, and 200 μg·L−1) was evaluated using static-water contact toxicity tests. The results showed that low methomyl concentrations (0.2 and 2 μg·L−1) had no significant effects on the contents of CHO, PREG, and PROG in the serum and testes of male tilapia (p > 0.05). Consequently, the concentration of 2 μg·L−1 could be used as a preliminary reference threshold for the non-effective dose of methomyl in male tilapia. Exposure to high methomyl concentrations (20 and 200 μg·L−1) significantly inhibited the levels of CHO, PREG, and PROG in the serum and testes of male tilapia (p < 0.05) and showed a dose–response relationship. Sex steroid hormone synthesis substrate damage to male tilapia caused by less than 20 μg·L−1 methomyl was reversible, while the damage caused by equal to or greater than 200 μg·L−1 methomyl was irreversible when tilapia were transferred to methomyl-free water for 18 days. Thus, a concentration of 200 μg·L−1 could be used as a reference threshold for irreversible damage caused by methomyl in male tilapia.

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