Age-related changes in ovarian characteristices, plasma sex steroids and fertility during pubertal development in captive female Murray cod Maccullochella peelii peelii

Newman, Dane M., Jones, Paul L. and Ingram, Brett A. 2008, Age-related changes in ovarian characteristices, plasma sex steroids and fertility during pubertal development in captive female Murray cod Maccullochella peelii peelii, Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, vol. 150, no. 4, pp. 444-451.

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Title Age-related changes in ovarian characteristices, plasma sex steroids and fertility during pubertal development in captive female Murray cod Maccullochella peelii peelii
Formatted title Age-related changes in ovarian characteristices, plasma sex steroids and fertility during pubertal development in captive female Murray cod Maccullochella peelii peelii
Author(s) Newman, Dane M.
Jones, Paul L.
Ingram, Brett A.
Journal name Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
Volume number 150
Issue number 4
Start page 444
End page 451
Total pages 8
Publisher Elsevier Inc.
Place of publication Amsterdam, The Netherlands
Publication date 2008-08
ISSN 1095-6433
1531-4332
Keyword(s) age-at-maturity
ovarian development
recirculating aquaculture systems
spawning
Summary Age-related changes in ovarian development characteristics and plasma sex steroids in female Murray cod were examined throughout their second, third and fourth years of life to better understand the physiological and endocrine processes associated with puberty in this species in captivity. Spawning performance of 2+ and 3+ year old females was also assessed to identify ontogenetic differences in egg fertility. Puberty was acquired in 38% of 1+ year old females and 100% of age 2+ females. By age 3+, all females had developed full (adult) reproductive function. Ovarian development in pubertal fish was characterised by a rapid transition between cortical alveoli and lipid droplet oogenic phases, coinciding with significantly lower plasma 17β-oestradiol in age 2+ females (p < 0.05). Mean mature oocyte diameter (2.44 mm), post-fertilisation viability (30.80%) and hatchability (0.99%) of eggs from age 2+ females were significantly reduced relative to age 3+ adults (2.81 mm, 84.89% and 23.58%, respectively). Ovaries of pubertal Murray cod exhibited both vitellogenic and ovulatory capacities, yet functional abnormalities during secondary oocyte growth are likely to have contributed to poor egg fertility and consequently, evaluations of age-at-first maturity based on the presence of advanced ovarian stages may overestimate the reproductive potential of younger broodstock populations.
Language eng
Field of Research 070206 Animal Reproduction
Socio Economic Objective 830399 Livestock Raising not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2008, Elsevier Inc.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30017885

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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