Skip to main content

Age and growth of Neotrygon picta, Neotrygon annotata and Neotrygon kuhlii from north-east Australia, with notes on their reproductive biology

Buy Article:

$51.00 plus tax (Refund Policy)


Vertebral band formations were used to define age and growth in three Neotrygon species caught regularly as by-catch in prawn trawl fisheries in north-east Australia. Centrum edge and marginal increment ratio analyses were used to validate annual band formations. Age estimates ranged from 1 to 18 years, with the von Bertalanffy growth function considered to have the best fit to Neotrygon picta (males, WD∞ = 271 mm, k = 0·12; females, WD∞ = 360·5 mm, k = 0·08) and Neotrygon kuhlii (males, WD∞ = 438·6 mm, k = 0·08; females, WD∞ = 440·6 mm, k = 0·08) disc width (WD)-at-age data. The Gompertz growth function had the best fit to Neotrygon annotata WD-at-age data (males, WD∞ = 230·4 mm, k = 0·20; females, WD∞ = 265·5 mm, k = 0·31). Age at sexual maturity ranged from 3 to 6 years, with N. picta having the smallest size at birth (100 mm WD), smallest WD at 50% maturity (WD50: male, 172 mm, female, 180·7 mm) and lowest age at sexual maturity (3–4 years). This study helps redefine and improve the accuracy of fisheries-based risk assessments for these small species with relatively conservative life-history variables.

Keywords: Gompertz function; Myliobatiformes; maskray biology; stingray

Document Type: Regular Paper


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

Publication date: December 1, 2010

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Partial Open Access Content
Partial Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect 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