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http://dx.doi.org/10.5657/kfas.2007.40.3.153

Activity of Sex Steroid Hormones on Ovarian Development in the Greenling Hexagrammos otakii  

Hwang, In-Joon (Department of Marine Biology, Pukyong National University)
Kim, Sung-Yeon (Aquaculture Research Team, Headquarters for Aquaculture, National Fisheries Research and Developmental Institute)
Baek, Hea-Ja (Department of Marine Biology, Pukyong National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.40, no.3, 2007 , pp. 153-159 More about this Journal
Abstract
We studied oocyte steroidogenesis in relation to oocyte development in the greenling, Hexagrammos otakii, a marine multiple spawner. Vitellogenic and mature oocytes were incubated in vitro in the presence or absence of $[^3H]-17\;{\alpha}-hydroxyprogesterone$ as a precursor. The major metabolites were androgens [androstenedione $(A)_4)$ and testosterone (T)] and estrogens [$17\;{\beta}-estradiol\;(E_2)$ and estrone ($E_1$)] in vitellogenic oocytes. The metabolic rate of T was lower in 1.08 to 12-mm oocytes, while that of $E_2$ increased with oocyte size. The endogenous productions of T, $E_2$ and 17 ${\alpha}-hydroxy$, 20 ${\beta}-dihydroprogesterone\;(17{\alpha}20{\beta}OHP)$ were quantified using a radioimmunoassay in the non-precursor group. The endogenous levels of T and $E_2$ were highest in 1.08 to 12-mm oocytes and $17{\alpha}20{\beta}OHP$ was produced only in 1.90 to 95-mm oocytes. The relationship between oocyte size and steroidogenesis showed that 1.08 to 12-mm oocytes are full vitellogenic following induction of the maturation process. Moreover, $17{\alpha}20{\beta}OHP$ acts as a maturation inducing hormone in H. otakii.
Keywords
Multiple spawner; Oocyte development; Sex steroid hormones;
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