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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 |
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container_title | General and comparative endocrinology |
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creator | Wylie, Matthew J. Setiawan, Alvin N. Irvine, Glen W. Symonds, Jane E. Elizur, Abigail Dos Santos, Marcileida 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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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.</description><identifier>ISSN: 0016-6480</identifier><identifier>EISSN: 1095-6840</identifier><identifier>DOI: 10.1016/j.ygcen.2017.08.022</identifier><identifier>PMID: 28851561</identifier><language>eng</language><publisher>United States: Elsevier Inc</publisher><subject>Aquaculture ; Estradiol-17β ; Gonadotropin receptor ; Hāpuku ; Oogenesis ; Puberty ; Temperature</subject><ispartof>General and comparative endocrinology, 2018-02, Vol.257, p.86-96</ispartof><rights>2017 Elsevier Inc.</rights><rights>Copyright © 2017 Elsevier Inc. All rights reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c359t-c98f374c14415446135bedf63abb52d542c0e1ea6453bc4d6846d3199fca6e713</citedby><cites>FETCH-LOGICAL-c359t-c98f374c14415446135bedf63abb52d542c0e1ea6453bc4d6846d3199fca6e713</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/28851561$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Wylie, Matthew J.</creatorcontrib><creatorcontrib>Setiawan, Alvin N.</creatorcontrib><creatorcontrib>Irvine, Glen W.</creatorcontrib><creatorcontrib>Symonds, Jane E.</creatorcontrib><creatorcontrib>Elizur, Abigail</creatorcontrib><creatorcontrib>Dos Santos, Marcileida</creatorcontrib><creatorcontrib>Lokman, P. Mark</creatorcontrib><title>Ovarian development of captive F1 wreckfish (hāpuku) Polyprion oxygeneios under constant and varying temperature regimes – Implications for broodstock management</title><title>General and comparative endocrinology</title><addtitle>Gen Comp Endocrinol</addtitle><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.</description><subject>Aquaculture</subject><subject>Estradiol-17β</subject><subject>Gonadotropin receptor</subject><subject>Hāpuku</subject><subject>Oogenesis</subject><subject>Puberty</subject><subject>Temperature</subject><issn>0016-6480</issn><issn>1095-6840</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp9kU1u1DAUxy0EokPhBEjIy7JIsOOPSRYsUEWhUqWygLXl2C-pZxI72MmU2dEz9AochZNwEjxMYcnqbX7v_z5-CL2kpKSEyjebct8b8GVF6LokdUmq6hFaUdKIQtacPEYrkrFC8pqcoGcpbQghgkn6FJ1UdS2okHSFflzvdHTaYws7GMI0gp9x6LDR0-x2gC8ovo1gtp1LN_js5ufdtGyX1_hTGPZTdMHj8G3fgwcXEl68hYhN8GnWOUV7i3P43vkezzBOEPW8RMARejdCwr--3-PLcRqc0XNOSrgLEbcxBJvmYLZ41F73cFjoOXrS6SHBi4d6ir5cvP98_rG4uv5wef7uqjBMNHNhmrpja24o51RwLikTLdhOMt22orKCV4YABS25YK3hNn9JWkabpjNawpqyU3R2zJ1i-LpAmtXokoFh0B7CkhRtGGs4J5RnlB1RE0NKETqV3zHmaxUl6qBHbdQfPeqgR5FaZT2569XDgKUdwf7r-esjA2-PAOQzdw6iSsaBN2BdtjArG9x_B_wGNsSnng</recordid><startdate>20180201</startdate><enddate>20180201</enddate><creator>Wylie, Matthew J.</creator><creator>Setiawan, Alvin N.</creator><creator>Irvine, Glen W.</creator><creator>Symonds, Jane E.</creator><creator>Elizur, Abigail</creator><creator>Dos Santos, Marcileida</creator><creator>Lokman, P. Mark</creator><general>Elsevier Inc</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20180201</creationdate><title>Ovarian development of captive F1 wreckfish (hāpuku) Polyprion oxygeneios under constant and varying temperature regimes – Implications for broodstock management</title><author>Wylie, Matthew J. ; Setiawan, Alvin N. ; Irvine, Glen W. ; Symonds, Jane E. ; Elizur, Abigail ; Dos Santos, Marcileida ; Lokman, P. 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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.</abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>28851561</pmid><doi>10.1016/j.ygcen.2017.08.022</doi><tpages>11</tpages></addata></record> |
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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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