Show simple item record

dc.contributor.authorHoang, T
dc.contributor.authorLee, SY
dc.contributor.authorKeenan, CP
dc.contributor.authorMarsden, GEG
dc.contributor.editorR P Wilson, B A Costa-Pierce, E.M. Donaldson
dc.date.accessioned2017-05-03T13:27:16Z
dc.date.available2017-05-03T13:27:16Z
dc.date.issued2003
dc.identifier.issn0044-8486
dc.identifier.doi10.1016/S0044-8486(02)00196-5
dc.identifier.urihttp://hdl.handle.net/10072/6076
dc.description.abstractTwo environmental manipulation protocols were tested against a current maturation technique (CONTROL) in an 81-day experiment. PROTOCOL 1 mimicked changes in the natural environment from winter to spring when ovarian maturation and spawning in Penaeus merguiensis starts. PROTOCOL 2 evaluated whether a clear improvement of temperature from a fluctuation period to a stable one could help trigger ovarian maturation. In phase A (first 30 days) of the experiment, temperature and day length were gradually increased from 22 to 27 àand from 10 to 14 h, respectively, while light intensity was stepwise reduced from 360 to 240, 120 and 5 lx for PROTOCOL 1. For PROTOCOL 2, light intensity and day length were manipulated as for PROTOCOL 1, but temperature was cycled from 22 to 27 àevery 3 days. In phase B (the following 30 days) temperature, light intensity and day length were stably maintained at optimal levels (27 ì 5 lx and 14 h light, respectively). During phase B, the proportion of female prawns reaching stages III and IV was significantly (P<0.05) highest in PROTOCOL 1 and lowest in the CONTROL. Of the total spawns by unablated females recorded in this phase, 55.6% was in PROTOCOL 1, 33.3% in PROTOCOL 2 and only 11.1% in the CONTROL. Mass spawning was induced by unilateral eyestalk ablation on day 60. Spawning performance of prawns were monitored for a further 21-day period (phase C). Overall, PROTOCOL 1, PROTOCOL 2 and the CONTROL produced 2.36, 1.96 and 1.53 million eggs, respectively. The latency period of spawners was shortest (P<0.05), whereas the proportion of spawners, fecundity, spawning rate and egg production/female were all improved in PROTOCOL 1. An improvement of prawn growth was observed in PROTOCOL 2. This study suggested that environmental manipulation could improve ovarian maturation and spawning rate of pond-reared P. merguiensis.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.publisher.placeNetherlands
dc.relation.ispartofpagefrom523
dc.relation.ispartofpageto534
dc.relation.ispartofedition2003
dc.relation.ispartofjournalAquaculture: an international journal devoted to fundamental aquatic food resources
dc.relation.ispartofvolume221
dc.subject.fieldofresearchZoology
dc.subject.fieldofresearchFisheries sciences
dc.subject.fieldofresearchcode3109
dc.subject.fieldofresearchcode3005
dc.titleImproved reproductive readiness of pond-reared broodstock Penaeus merguiensis by environmental manipulation
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.date.issued2015-02-12T04:23:16Z
gro.hasfulltextNo Full Text
gro.griffith.authorLee, Joe Y.
gro.griffith.authorHoang, Tung


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

  • Journal articles
    Contains articles published by Griffith authors in scholarly journals.

Show simple item record