Journal article
Ovarian development of captive F1 wreckfish (hāpuku) Polyprion oxygeneios under constant and varying temperature regimes – implications for broodstock management
General and Comparative Endocrinology, Vol.257, pp.86-96
2018
Abstract
In order to better understand how photo-thermal conditions affect oogenesis in captive-bred F1 hāpuku, a wreckfish considered for aquaculture in New Zealand, juvenile (pre-pubertal) fish were assigned to one of two regimes: exposed to a constant temperature of 17 °C (CT group) or to seasonally varying temperatures (VT group range: 10-17 °C), both under simulated ambient photoperiod, for nearly 2 years. Development in females was monitored through repeated gonadal biopsies (histology; target gene mRNA levels) and blood sampling (plasma levels of estradiol-17β; E2). Very little evidence of advancing oogenesis was found in the first year of study, when fish were in their 4th year. In the subsequent year, a proportion of fish reached the pre-spawning stage (fully-grown ovarian follicles); the proportion of females reaching this stage was notably higher in the VT (62%) than the CT (28%) group. Of the few females that did reach maturity in the CT group, significantly lower levels of plasma E2 were observed relative to those in fish from the VT group possibly indicating a temperature-induced endocrine impairment during oogenesis. Interestingly, females that did not reach the pre-spawning stage presented with a small transient, but significant increase in oocyte diameters and plasma E2, suggestive of a dummy run. Clear seasonality was observed for fish under both photo-thermal regimes, and this was reflected in plasma E2 levels and transcript abundances of aromatase, fshr and luteinizing hormone receptor in the ovary; these end points all peaked in maturing females during the late or post-vitellogenic stage. We conclude that captive female F1 hāpuku first mature as five-year-olds and that exposure to a decreased temperature is important for appropriate progression of oogenesis.
Details
- Title
- Ovarian development of captive F1 wreckfish (hāpuku) Polyprion oxygeneios under constant and varying temperature regimes – implications for broodstock management
- Authors
- Matthew J Wylie (Author) - University of Otago, New ZealandAlvin N Setiawan (Author) - Northland Marine Research Centre, New ZealandGlen W Irvine (Author) - Northland Marine Research Centre, New ZealandJane E Symonds (Author) - Northland Marine Research Centre, New ZealandAbigail Elizur (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringMarcileida Dos Santos (Author) - University of Otago, New ZealandP Mark Lokman (Author) - University of Otago, New Zealand
- Publication details
- General and Comparative Endocrinology, Vol.257, pp.86-96
- Publisher
- Academic Press
- Date published
- 2018
- DOI
- 10.1016/j.ygcen.2017.08.022
- ISSN
- 0016-6480
- Copyright note
- Copyright © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
- Organisation Unit
- University of the Sunshine Coast, Queensland; Centre for Bioinnovation
- Language
- English
- Record Identifier
- 99451087102621
- Output Type
- Journal article
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- Domestic collaboration
- International collaboration
- Web Of Science research areas
- Endocrinology & Metabolism
- Zoology
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