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Ovarian development of captive F1 wreckfish (hāpuku) Polyprion oxygeneios under constant and varying temperature regimes – Implications for broodstock management

•Sexual maturity in captive F1 hāpuku can occur at 5years of age.•Fewer fish reached the pre-spawning stage at constant water temperatures of 17°C.•Reproduction was seasonal in fish exposed to a simulated ambient photoperiod.•Plasma estradiol-17β levels may prove valuable predictors of ovarian devel...

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Published in:General and comparative endocrinology 2018-02, Vol.257, p.86-96
Main Authors: Wylie, Matthew J., Setiawan, Alvin N., Irvine, Glen W., Symonds, Jane E., Elizur, Abigail, Dos Santos, Marcileida, Lokman, P. Mark
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cited_by cdi_FETCH-LOGICAL-c359t-c98f374c14415446135bedf63abb52d542c0e1ea6453bc4d6846d3199fca6e713
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container_title General and comparative endocrinology
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creator Wylie, Matthew J.
Setiawan, Alvin N.
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Lokman, P. Mark
description •Sexual maturity in captive F1 hāpuku can occur at 5years of age.•Fewer fish reached the pre-spawning stage at constant water temperatures of 17°C.•Reproduction was seasonal in fish exposed to a simulated ambient photoperiod.•Plasma estradiol-17β levels may prove valuable predictors of ovarian development. 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 2years. 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.
doi_str_mv 10.1016/j.ygcen.2017.08.022
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subjects Aquaculture
Estradiol-17β
Gonadotropin receptor
Hāpuku
Oogenesis
Puberty
Temperature
title Ovarian development of captive F1 wreckfish (hāpuku) Polyprion oxygeneios under constant and varying temperature regimes – Implications for broodstock management
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