Document Detail

The pattern of ovarian development in the prepubertal antarctic minke whale (Balaenoptera bonaerensis).
MedLine Citation:
PMID:  15329469     Owner:  NLM     Status:  MEDLINE    
This study describes the morphological and morphometrical changes associated with prepubertal ovarian development in the Antarctic minke whale (Balaenoptera bonaerensis). Ovaries were harvested from 94 immature minke whales caught in the Antarctic Ocean during the summer feeding season (December-March). Notable differences in ovarian size and morphology were found among animals. Up to 10 folds difference in ovarian weight was found among prepubertal whales of similar body size. During the prepubertal period, ovaries grew slowly and approximately doubled their weight. The morphologies of right and left ovaries were almost identical while the growth of the ovary appears to occur preferentially on the right side. The most striking morphological feature was numerous small antral follicles less than 5 mm in diameter found in ovaries of younger immature whales. The occurrence of these ovaries was highest in whales less than 6 m long and gradually decreased as body length increased. In larger whales, the occurrence of ovaries with a smaller number of follicles up to 10 mm and thick tunica albuginea increased. Thus, the ovary of the Antarctic minke whale experiences bursts of small follicular development during the early prepubertal period before becoming a more developed ovary with fewer but larger follicles, and thick tunica albuginea.
Masafumi Tetsuka; Masatsugu Asada; Toshihiro Mogoe; Yutaka Fukui; Hajime Ishikawa; Seiji Ohsumi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of reproduction and development     Volume:  50     ISSN:  0916-8818     ISO Abbreviation:  J. Reprod. Dev.     Publication Date:  2004 Aug 
Date Detail:
Created Date:  2004-08-26     Completed Date:  2005-02-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9438792     Medline TA:  J Reprod Dev     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  381-9     Citation Subset:  IM    
Department of Agricultural and Life Science, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido, Japan.
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MeSH Terms
Antarctic Regions
Ovary / anatomy & histology,  growth & development*,  physiology
Sexual Maturation / physiology*
Whales / physiology*

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