Studies of Gonadal Steroids Involved in Final Gonadial Maturation in the Japanese Eel, Anguilla japonica, a Review
✍ Scribed by Kohei Yamauchi
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 130 KB
- Volume
- 75
- Category
- Article
- ISSN
- 1434-2944
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✦ Synopsis
Vitellogenesis in females and spermatogenesis in males were stimulated by exogeneous gonadotropic preparations. However, the subsequent oocyte maturation and spermiation did not advance because of the insuffiency of circulating 17a, 20/?-dihydroxy-4-pregnen-3-one (17a, 2OP-diOHprog). At the time of maturation, the injection of 17a, 20g-diOHprog induced oocyte maturation and ovulation in females and spermiation (increase in volume of seminal plasma and acquisition of sperm motility) in male. These results suggest strongly that 17a, 2O/?-diOHprog play a key role in the final maturat,ion of the Japanese eel.
We investigated the physiological participation of gonadal steroids in the regulation of the gonadal development in Japanese eels, Anguilla japonica, following the weekly adniinistration of exogeneous pituitary hormone.
Female: Histological observation indicated that all silver females (800-1,500 g BW) showed oocyte growth and thereafter finished vitellogenesis in response to chum salmon pituitary powder (2 mg/100 g BW) (YAMAUCHI and YAMAMOTO, 1982).