If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Life history of the blackspotted whipray Himantura astra

$48.00 plus tax (Refund Policy)

Download / Buy Article:

Abstract:

Features of the life history of Himantura astra from north-east Australia were examined including its age and growth, reproduction and diet. Centrum edge and marginal increment ratio analyses were used to validate annual band formations with the Gompertz growth function providing the best fit to male (WD∞ = 722·7 mm, k = 0·104) and female (WD∞ = 821·8 mm, k = 0·073) disc width (WD)-at-age data. At 29 years, the maximum age of females was higher than males (18 years). Sizes at 50% sexual maturity (WD50) for males and females were 469·3 and 462·3 mm, respectively. Ages at sexual maturity (AM50) were reported at 7·32 (males) and 8·67 (females) years. An index of relative importance (IRI) revealed carid shrimps (77·9%), brachyurans (12·1%) and stomatopods (4·9%) as the most important prey groups, with prey diversity increasing with WD from 0·92 to 1·63 (Shannon–Weiner index). This study provides significant insights into the biology of H. astra and contributes to the ongoing development of fisheries-based risk assessments for this species.

Keywords: Dasyatidae; by-catch; diet; reproduction; von Bertalanffy

Document Type: Regular Paper

DOI: http://dx.doi.org/10.1111/j.1095-8649.2011.02933.x

Affiliations: School of Biomedical Sciences, University of Queensland, Brisbane 4072, Queensland, Australia

Publication date: April 1, 2011

Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more