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Plasma Sex Steroid Hormone Profiles in Artificially Maturing Wild Eel, Anguilla japonica  

Kim, Dae-Jung (Aquaculture Research Team, NFRDI)
Kim, Eung-Oh (Aquaculture Research Team, NFRDI)
Park, Min-Woo (Aquaculture Research Team, NFRDI)
Cho, Yong-Chul (Inland Aquaculture Research Institute, NFRDI)
Lim, Sang-Gu (Inland Aquaculture Research Institute, NFRDI)
Publication Information
Journal of Aquaculture / v.19, no.4, 2006 , pp. 267-274 More about this Journal
Abstract
To understand the changes in plasma levels of sex steroids in the wild Japanese eel Anguilla japonica during artificially maturing process, eels received weekly intraperitoneal injections of a water-in-oil (W/O) type emulsion with Freund`s incomplete adjuvant containing salmon pituitary extract (SPE; 20 mg pituitary powder/fish) were examined. In the weekly Eel's Ringer-treated control wild eels, the body weight (BW) changes of fish decreased slowly during the experiment period. Plasma testosterone (T), $estradiol-17{\beta}\;(E_2)$ and $17a,20{\beta}-dihydroxyprogesterone$ (DHP) levels did not change significantly at the end of the experiment. In the weekly SPE-treated silver eels, however, rapid increase in BW changes occurred after 6 to 10 weeks, and the oocytes of all fish were observed to be in the migratory nucleus stage. Furthermore, significant increase in sex steroid hormones (T and $E_2$) levels occurred from 6 weeks. In the weekly SPE-treated yellow eels, the BW changes of fish increased slowly at 6 weeks and then increased. In these fish, the oocytes were at the tertiary yolk globule stage even at the end of the experiment. Plasma sex steroid hormones profiles revealed individual variability in SPE-treated yellow eels. Plasma T and $E_2$ levels significantly increased at 8 weeks and after 6 weeks, respectively, in SPE-treated yellow eels. In the weekly SPE-treated wild eels (silver and yellow eels), however, plasma DHP levels did not change significantly during the experiment period. In silver eel, final maturation could be induced by weekly administration of SPE using W/O type emulsion.
Keywords
Wild eel; Anguilla japonica; Artificial maturation; Sex steroid hormone;
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