Temporal dynamics of oocyte development, plasma sex steroids and somatic energy reserves during seasonal ovarian maturation in captive Murray cod Maccullochella peelii peellii

Newman, Dane M., Jones, Paul and Ingram, Brett A. 2007, Temporal dynamics of oocyte development, plasma sex steroids and somatic energy reserves during seasonal ovarian maturation in captive Murray cod Maccullochella peelii peellii, Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, vol. 148, no. 4, pp. 876-887.


Title Temporal dynamics of oocyte development, plasma sex steroids and somatic energy reserves during seasonal ovarian maturation in captive Murray cod Maccullochella peelii peellii
Author(s) Newman, Dane M.
Jones, Paul
Ingram, Brett A.
Journal name Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
Volume number 148
Issue number 4
Start page 876
End page 887
Publisher Elsevier Inc
Place of publication Amsterdam, Netherlands
Publication date 2007-12
ISSN 1095-6433
Keyword(s) captivity
Maccullochella peelii peelii
oocyte growth
ovarian maturation
sex steroids
somatic energy reserves
Summary The temporal dynamics of oocyte growth, plasma sex steroids and somatic energy stores were examined during a 12 month ovarian maturation cycle in captive Murray cod Maccullochella peelii peelii under simulated natural photothermal conditions. Ovarian function was found to be relatively uninhibited in captivity, with the exception that post-vitellogenic follicles failed to undergo final maturation, resulting in widespread pre-ovulatory atresia. Seasonal patterns of oocyte growth were characterised by cortical alveoli accumulation in March, deposition of lipids in April, and vitellogenesis between May and September. Two distinct batches of vitellogenic oocytes were found in Murray cod ovaries, indicating a capacity for multiple spawns. Plasma profiles of 17β-oestradiol and testosterone were both highly variable during the maturation period suggesting that multiple roles exist for these steroids during different stages of oocyte growth. Condition factor, liver size and visceral fat stores were all found to increase prior to, or during the peak phase of vitellogenic growth. Murray cod appear to strategically utilise episodes of high feeding activity to accrue energy reserves early in the reproductive cycle prior to its deployment during periods of rapid ovarian growth.
Notes Available online 11 September 2007.
Language eng
Field of Research 070206 Animal Reproduction
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007, Elsevier Inc.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007823

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