Ba A, Diouf K, Guilhaumon F, Panfili J
Département de Biologie Animale, Faculté des Sciences et Techniques, Université Cheikh Anta Diop de Dakar, B. P. 5005, Dakar Fann, Dakar, Senegal.
Laboratoire de Biologie Marine, LABEP-AO, IFAN-Ch. A. Diop, B. P. 206, Dakar, Senegal.
J Fish Biol. 2015 Oct;87(4):912-29. doi: 10.1111/jfb.12764.
Age and growth of Rhizoprionodon acutus were estimated from vertebrae age bands. From December 2009 to November 2010, 423 R. acutus between 37 and 112 cm total length (LT ) were sampled along the Senegalese coast. Marginal increment ratio was used to check annual band deposition. Three growth models were adjusted to the length at age and compared using Akaike's information criterion. The Gompertz growth model with estimated size at birth appeared to be the best and resulted in growth parameters of L∞ = 139.55 (LT ) and K = 0.17 year(-1) for females and L∞ = 126.52 (LT ) and K = 0.18 year(-1) for males. The largest female and male examined were 8 and 9 years old, but the majority was between 1 and 3 years old. Ages at maturity estimated were 5.8 and 4.8 years for females and males, respectively. These results suggest that R. acutus is a slow-growing species, which render the species particularly vulnerable to heavy fishery exploitation. The growth parameters estimated in this study are crucial for stock assessments and for demographic analyses to evaluate the sustainability of commercial harvests.
根据脊椎骨年龄带对尖吻斜齿鲨的年龄和生长进行了估计。2009年12月至2010年11月，在塞内加尔海岸对423条全长37至112厘米的尖吻斜齿鲨进行了采样。利用边缘增量比来检查年轮的沉积情况。将三种生长模型与年龄对应的体长进行拟合，并使用赤池信息准则进行比较。带有出生时估计体长的冈珀茨生长模型似乎是最佳模型，得出雌性的生长参数为L∞ = 139.55（厘米），K = 0.17年-1，雄性的生长参数为L∞ = 126.52（厘米），K = 0.18年-1。所检查的最大雌性和雄性分别为8岁和9岁，但大多数个体年龄在1至3岁之间。估计的雌性和雄性成熟年龄分别为5.8岁和4.8岁。这些结果表明，尖吻斜齿鲨是一种生长缓慢的物种，这使得该物种特别容易受到过度渔业开发的影响。本研究中估计的生长参数对于种群评估和人口统计学分析以评估商业捕捞的可持续性至关重要。
