School of Biomedical Sciences, University of Queensland, Brisbane 4072, Queensland, Australia.
J Fish Biol. 2011 Apr;78(4):1249-68. doi: 10.1111/j.1095-8649.2011.02933.x.
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 (W(D∞) = 722·7 mm, k = 0·104) and female (W(D∞) = 821·8 mm, k = 0·073) disc width (W(D))-at-age data. At 29 years, the maximum age of females was higher than males (18 years). Sizes at 50% sexual maturity (W(D50)) for males and females were 469·3 and 462·3 mm, respectively. Ages at sexual maturity (A(M50)) were reported at 7·32 (males) and 8·67 (females) years. An index of relative importance (I(RI)) revealed carid shrimps (77·9%), brachyurans (12·1%) and stomatopods (4·9%) as the most important prey groups, with prey diversity increasing with W(D) 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.
对来自澳大利亚东北部的赫氏魟的生活史特征进行了研究，包括其年龄和生长、繁殖和饮食。边缘和边缘增量比分析用于验证年度带形成，采用 Gompertz 生长函数对雌雄魟的盘宽（W(D)）-年龄数据拟合最好（雄性 W(D∞) = 722.7 毫米，k = 0.104；雌性 W(D∞) = 821.8 毫米，k = 0.073）。在 29 岁时，雌性的最大年龄高于雄性（18 岁）。雌雄 50%性成熟（W(D50)）的大小分别为 469.3 毫米和 462.3 毫米。性成熟年龄（A(M50)）分别为 7.32 岁（雄性）和 8.67 岁（雌性）。相对重要性指数（I(RI)）表明，甲壳类虾（77.9%）、短尾类（12.1%）和口足类（4.9%）是最重要的猎物群体，随着 W(D)从 0.92 增加到 1.63（香农-威纳指数），猎物多样性增加。本研究为 H. astra 的生物学提供了重要的见解，并为该物种基于渔业的风险评估的持续发展做出了贡献。
