Reproductive biology of wahoo, Acanthocybium solandri, off eastern Australia

Zischke, Mitchell T., Farley, Jessica H., Griffiths, Shane P. and Tibbetts, Ian R. (2013) Reproductive biology of wahoo, Acanthocybium solandri, off eastern Australia. Reviews in Fish Biology and Fisheries, 23 4: 491-506. doi:10.1007/s11160-013-9304-z


Author Zischke, Mitchell T.
Farley, Jessica H.
Griffiths, Shane P.
Tibbetts, Ian R.
Title Reproductive biology of wahoo, Acanthocybium solandri, off eastern Australia
Formatted title
Reproductive biology of wahoo, Acanthocybium solandri, off eastern Australia
Journal name Reviews in Fish Biology and Fisheries   Check publisher's open access policy
ISSN 0960-3166
1573-5184
Publication date 2013-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1007/s11160-013-9304-z
Open Access Status Not yet assessed
Volume 23
Issue 4
Start page 491
End page 506
Total pages 16
Place of publication Dordrecht, Netherlands
Publisher Springer
Language eng
Abstract A dearth of basic biological information for wahoo, Acanthocybium solandri, currently hinders the ability of scientists and managers to assess population sustainability and appropriately manage the dramatically increasing global catch. This study examined the gonads of 382 wahoo collected off eastern Australia during 2008-2011 to quantify their reproductive biology in the region. The overall sex ratio of the sample was 3.2:1 (females:males), however this differed significantly among fishing sectors and areas. The estimated fork length at which 50 % of female wahoo reach maturity was 1,046 mm. Similar to the Atlantic Ocean, female wahoo have a protracted summer spawning season during October-February. The mean spawning frequency of female wahoo was uncertain but may be approximately 2-3 days, with evidence of fish actively spawning on consecutive days. Batch fecundity of females was positively correlated with fish size and estimates ranged between 0.65 and 5.12 million oocytes. Relative fecundity was estimated at 122.0 (+/- 9.7) oocytes per gram of ovary free body weight and did not differ with fish size or throughout the spawning season. Estimation of reproductive parameters such as size- and age-at-maturity may facilitate the construction of per-recruit stock assessments of wahoo in the region.
Formatted abstract
A dearth of basic biological information for wahoo, Acanthocybium solandri, currently hinders the ability of scientists and managers to assess population sustainability and appropriately manage the dramatically increasing global catch. This study examined the gonads of 382 wahoo collected off eastern Australia during 2008-2011 to quantify their reproductive biology in the region. The overall sex ratio of the sample was 3.2:1 (females:males), however this differed significantly among fishing sectors and areas. The estimated fork length at which 50 % of female wahoo reach maturity was 1,046 mm. Similar to the Atlantic Ocean, female wahoo have a protracted summer spawning season during October-February. The mean spawning frequency of female wahoo was uncertain but may be approximately 2-3 days, with evidence of fish actively spawning on consecutive days. Batch fecundity of females was positively correlated with fish size and estimates ranged between 0.65 and 5.12 million oocytes. Relative fecundity was estimated at 122.0 (±9.7) oocytes per gram of ovary free body weight and did not differ with fish size or throughout the spawning season. Estimation of reproductive parameters such as size- and age-at-maturity may facilitate the construction of per-recruit stock assessments of wahoo in the region. 
Keyword Fecundity
Maturity
Pelagic
Scombridae
Sex ratio
Spawning
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Biological Sciences Publications
 
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