Show simple item record

Share 
 
dc.contributor.authorPalma, Peter
dc.contributor.authorTakemura, Akihiro
dc.contributor.authorLibunao, Gardel Xyza
dc.contributor.authorSuperio, Joshua
dc.contributor.authorde Jesus-Ayson, Evelyn Grace
dc.contributor.authorAyson, Felix
dc.contributor.authorNocillado, Josephine
dc.contributor.authorDennis, Lachlan
dc.contributor.authorChan, Josielou
dc.contributor.authorThai, Truong Quoc
dc.contributor.authorNinh, Nguyen Huu
dc.contributor.authorElizur, Abigail
dc.date.accessioned2019-05-14T03:12:01Z
dc.date.available2019-05-14T03:12:01Z
dc.date.issued2019-05-02
dc.identifier.citationPalma, P., Takemura, A., Libunao, G. X., Superio, J., de Jesus-Ayson, E. G., Ayson, F., … Elizur, A. (2019). Reproductive development of the threatened giant grouper Epinephelus lanceolatus. Aquaculture, 509, 1-7. https://doi.org/10.1016/j.aquaculture.2019.05.001en
dc.identifier.issn0044-8486
dc.identifier.urihttp://hdl.handle.net/10862/3449
dc.description.abstractThe giant grouper is presumed to follow the reproductive pattern of most Epinephelus species, characterized by protogynous hermaphroditism wherein male maturation is attained through sex reversal of a functional female. This hypothesis, however, has not been verified due to lack of biological data. The present study addresses this gap by investigating the reproductive development of giant groupers from juvenile stage through sexual maturity. Gonad histological analysis of hatchery-bred juvenile giant grouper from Queensland, Australia (0.8–5.2 kg, n = 43) have shown earliest occurrence of primary oocytes (i.e. ovarian differentiation) in 47.8 cm and 2.5 kg fish. Monitoring of sexual maturity by gonadal biopsy was performed in a stock of wild-caught giant groupers (2–52 kg) held in sea cages in the Philippines and Vietnam from 2015 to 2017. Onset of female sexual maturity was at 96.9 ± 1.6 cm and 23.5 ± 1.5 kg in the Philippines, and 103.0 ± 4.1 cm and 33.5 ± 2.5 kg in Vietnam. In both locations, development of primary males was observed wherein fish produced milt (or spermiated) without passing through a functional female phase. The ratio of primary males to females in both locations was about 1:2. Size at maturity of primary males is 86.5 ± 4.8 cm and 17.1 ± 2.1 kg in the Philippines, and 97.3 ± 1.3 cm and 34.3 ± 0.9 kg in Vietnam. To aid in the monitoring of female maturation, we developed a non-invasive method based on immunoassay of vitellogenin in skin mucus and this was shown to be effective in detecting female maturation 9 ± 2 months prior to first observation of oocytes through gonadal biopsy. Our findings suggest that giant grouper is a diandric protogynous hermaphrodite. This study provides novel information on the reproductive biology of giant grouper, an economically important and vulnerable species.en
dc.description.sponsorshipThis study was funded by the Australian Centre for International Agricultural Research (ACIAR) through project no. FIS/2012/101 granted to Abigail Elizur, Evelyn Grace de Jesus-Ayson and Nguyen Huu Ninh (SEAFDEC/AQD study code 6149-T-RD-ACIAR4). P. Palma was a recipient of an ACIAR funded Australia Awards John Allwright Fellowship.en
dc.language.isoenen
dc.publisherElsevieren
dc.subjectGroupersen
dc.subjectEpinephelus lanceolatus
dc.titleReproductive development of the threatened giant grouper Epinephelus lanceolatusen
dc.typeArticleen
dc.citation.volume509
dc.citation.spage1
dc.citation.epage7
dc.citation.journalTitleAquacultureen
dc.subject.asfaSexual maturityen
dc.subject.asfaVitellogenesisen
dc.subject.asfaEnzyme-linked immunosorbent assayen
dc.identifier.doi10.1016/j.aquaculture.2019.05.001


Files in this item

FilesSizeFormatView

This item appears in the following Collection(s)

  • AQD Journal Articles [1139]
    These papers were contributed by AQD staff to various national and international journals

Show simple item record