Biología de Peces, Instituto de Investigaciones Marinas y Costeras, Universidad Nacional de Mar del Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
Instituto Nacional de Limnología, Universidad Nacional del Litoral, CONICET, Santa Fe, Argentina.
J Fish Biol. 2021 Oct;99(4):1328-1340. doi: 10.1111/jfb.14839. Epub 2021 Jul 26.
The spotback skate Atlantoraja castelnaui (Arhynchobatidae) is a large and threatened skate species subjected to fishing pressure, endemic to the Southwest Atlantic that occurs from Rio de Janeiro, Brazil, to San Jorge Gulf, Argentina. The age, growth, age at maturity and the maximum intrinsic rate of population increase r of A. castelnaui were studied using 152 specimens collected from off Uruguay and north Argentina (35°-42° S), between June 2013 and February 2020. Vertebrae from 143 individuals were used for ageing (females: n = 83, size range 404-1300 mm total length, TL; males: n = 60, size range 400-1270 mm TL). Maximum ages determined for females and males were 30 and 28 years, respectively. To fit growth models, non-linear and Bayesian estimation approaches were considered. For the first approach, a set of four candidate growth (size-at-age) models were fitted: three-parameter von Bertalanffy, two-parameter von Bertalanffy with fixed L , Gompertz and Logistic. In the second approach, von Bertalanffy, Gompertz and Logistic were fitted. For non-linear estimation, model selection indicated that the entire set of candidate growth models were supported by the data. The von Bertalanffy was selected as the best model for Bayesian estimation. There were no differences in growth between sexes. For the sexes combined, the von Bertalanffy growth model by Bayesian method was considered the most adequate to describe the growth of A. castelnaui (growth mean parameters ± S.D.: L = 1210.29 ± 40.68 mm; k = 0.12 ± 0.01 years ; L = 179.20 ± 11.62 mm). The age at maturity was estimated at 16.21 and 14.04 years for females and males, respectively. The maximum intrinsic rate of population increase r was estimated as 0.252 years . Life-history traits and r provided in the present study suggest that this species has a relatively low productivity and may be vulnerable to an intense fishing pressure.
斑点长尾鲨（Arhynchobatidae）是一种大型受威胁的鲨鱼物种，受到钓鱼压力的影响，分布于西南大西洋，从巴西里约热内卢到阿根廷圣豪尔赫湾。本研究使用了 2013 年 6 月至 2020 年 2 月期间从乌拉圭和阿根廷北部（35°-42° S）采集的 152 个标本，研究了斑点长尾鲨的年龄、生长、成熟年龄和最大内禀增长率 r。从 143 个个体的椎骨中获取年龄数据（雌性：n=83，大小范围为 404-1300 毫米总长度（TL）；雄性：n=60，大小范围为 400-1270 毫米 TL）。确定的雌性和雄性最大年龄分别为 30 岁和 28 岁。为了拟合生长模型，考虑了非线性和贝叶斯估计方法。对于第一种方法，拟合了一组四个候选生长（年龄-大小）模型：三参数 von Bertalanffy、两参数 von Bertalanffy 带固定 L 、Gompertz 和 Logistic。在第二种方法中，拟合了 von Bertalanffy、Gompertz 和 Logistic。对于非线性估计，模型选择表明，数据支持候选生长模型的全部。von Bertalanffy 被选为贝叶斯估计的最佳模型。雌雄之间的生长没有差异。对于雌雄混合，贝叶斯方法的 von Bertalanffy 生长模型被认为最适合描述 A. castelnaui 的生长（生长平均参数±标准差：L=1210.29±40.68 毫米；k=0.12±0.01 年；L=179.20±11.62 毫米）。雌性和雄性的成熟年龄分别估计为 16.21 岁和 14.04 岁。最大内禀增长率 r 估计为 0.252 年。本研究提供的生活史特征和 r 表明，该物种的生产力相对较低，可能容易受到强烈的捕捞压力的影响。
