1. Changes in Plasma and Ovarian Steroid Hormone Level in Wild Female Blue Tang Fish Paracanthurus hepatus during a Reproductive Cycle
- Author
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Huynh Minh Sang, Pham Xuan Ky, Ho Son Lam, Le Ho Khanh Hy, and Phan Minh-Thu
- Subjects
endocrine system ,steroid hormones ,ovarian development ,wild blue tang ,Ovary ,Reproductive cycle ,Andrology ,03 medical and health sciences ,lcsh:Zoology ,medicine ,lcsh:QL1-991 ,Ovarian steroid ,Testosterone ,030304 developmental biology ,0303 health sciences ,lcsh:Veterinary medicine ,General Veterinary ,biology ,04 agricultural and veterinary sciences ,biology.organism_classification ,Hepatus ,Gonadosomatic Index ,gsi ,medicine.anatomical_structure ,040102 fisheries ,elisa ,0401 agriculture, forestry, and fisheries ,%22">Fish ,lcsh:SF600-1100 ,Animal Science and Zoology ,hormones, hormone substitutes, and hormone antagonists ,Hormone - Abstract
This study aimed to document the seasonal cycle of steroid levels in the plasma and ovary, including testosterone (T), estradiol-17&beta, (E2) and 17&alpha, 20&beta, dihydroxy-4-pregnen-3-one (DHP) in relation to ovarian development in wild populations of female blue tang fish. The gonadosomatic index (GSI%) maintained high values from April to July and increased from the II to IV ovarian stages and dropped in the V stage. Levels of plasma, ovary T and E2 and DHP were high from March to July. Plasma T and E2 levels were low in the II stage when most oocytes were previtellogenic, reaching a peak during spawning, and decreased in the V stages when fish were going to late spawning and termination. DHP was detected in all stages of the ovary with a higher level in spawning fish but decreased after spawning. These results revealed that T, E2 and DHP could be involved in ovarian development and DHP may play a significant role as a maturational inducing hormone in blue tang fish.
- Published
- 2019