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

作者：Jacobsen I P^*; Bennett M B

来源：Journal of Fish Biology, 2010, 77(10): 2405-2422.

DOI：10.1111/j.1095-8649.2010.02829.x

• Gompertz function
• maskray biology
• Myliobatiformes
• stingray

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, W(D infinity) = 271 mm, k = 0 center dot 12; females, W(D infinity) = 360 center dot 5 mm, k = 0 center dot 08) and Neotrygon kuhlii (males, W(D infinity) = 438 center dot 6 mm, k = 0 center dot 08; females, W(D infinity) = 440 center dot 6 mm, k = 0 center dot 08) disc width (W(D))-at-age data. The Gompertz growth function had the best fit to Neotrygon annotata W(D)-at-age data (males, W(D infinity) = 230 center dot 4 mm, k = 0 center dot 20; females, W(D infinity) = 265 center dot 5 mm, k = 0 center dot 31). Age at sexual maturity ranged from 3 to 6 years, with N. picta having the smallest size at birth (100 mm W(D)), smallest W(D) at 50% maturity (W(D50): male, 172 mm, female, 180 center dot 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.

• 出版日期2010-12