Characterization of Oocyte Development in Hatchery-Reared Burbot

Autor: John R. Foltz, Susan C. Ireland, Nathan R. Jensen, Mark P. Polinski, Kenneth D. Cain
Rok vydání: 2012
Předmět:
Zdroj: North American Journal of Aquaculture. 74:408-412
ISSN: 1548-8454
1522-2055
DOI: 10.1080/15222055.2012.676001
Popis: Burbot Lota lota are an emerging aquaculture species. To aid in predicting the natural and hormonal-manipulated timing of ovulation and for ensuring maximum viability of eggs at spawning, this study describes oocyte maturation of hatchery-reared burbot from vitellogenesis through ovulation. At a temperature of 4°C, visual polarization of the oil globule occurred 7–13 d preovulation. The lack of uniformity in individual oocyte development was observed and persisted until approximately 2 d before ovulation, at which point complete polarization was observed in all oocytes and a condensed blastomere was observed along the inner chorion. These preliminary observations imply that implantation of gonatotropin-releasing hormone (GnRH) decreased the final maturation stage of oocyte development by 2–4 d and may aid in initiating the maturation process, the induction of which appeared to be a threshold for either a female's progression to ovulation or nonovulation and atresia. Although additional investigat...
Databáze: OpenAIRE
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