Abstract The age and growth of southern boarfish (Pentaceros richardsoni) was determined from samples collected by deep-sea trawlers over the Lord Howe Rise region in the Tasman Sea and Walters Shoal region in the south-west Indian Ocean. The number of growth (opaque) zones counted in whole otoliths and in thick sections (450 μm) of otoliths were lower than the counts of opaque zones in thin-sections (300 μm) of otoliths. Visual analyses and modelling of the trends in marginal increments on thin-sections of otoliths show that opaque zones are formed annually. The maximum ages determined for female and male P. richardsoni of 41 and 60 years respectively, greatly exceed the estimate of 14 years previously determined for this species based on counts of opaque zones in whole otoliths and the 2–8 years for its congener Pentaceros wheeleri from the North Pacific Ocean (NPO). The high maximum age for P. richardsoni and corresponding low natural mortality rates parallel those of Pentacerotids in coastal waters of southern Australia. Trends in the growth of P. richardsoni from the Tasman Sea demonstrate that this species exhibits rapid growth in the first 4–5 years of life with little or no subsequent growth throughout the remainder of their protracted life, which is analogous to other Pentacerotids. The truncation of the lengths and ages of P. richardsoni from the Walters Shoal suggests that the population of this species in these waters has experienced greater fishing mortality than the populations over the Lord Howe Rise region in the Tasman Sea, which is also confirmed by the far higher total mortality estimates in the former region. These findings for P. richardsoni, and the knowledge that P. wheeleri populations in the NPO have still not recovered from sustained, high fishing mortalities in the late 1960s to mid-1970s should inform the management strategies for P. richardsoni in the Southern Hemisphere.

中文翻译：

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薄切耳石揭示了南方野猪 (Pentaceros richardsoni) 的寿命延长，并用于研究海洋间长度、年龄结构和生长的差异

摘要 从塔斯曼海豪勋爵海隆地区和印度洋西南部沃尔特斯浅滩地区的深海拖网渔船收集的样本中确定了南方野猪 (Pentaceros richardsoni) 的年龄和生长情况。在整个耳石和耳石的厚部分（450μm）中计数的生长（不透明）区域的数量低于耳石的薄片（300μm）中的不透明区域的数量。耳石薄片边缘增量趋势的可视化分析和建模表明，每年都会形成不透明区域。确定的雌性和雄性 P. richardsoni 的最大年龄分别为 41 和 60 岁，大大超过了先前根据整个耳石中不透明区域的计数确定的该物种 14 年的估计值，以及来自北太平洋 (NPO) 的同系物 Pentaceros Wheeleri 的 2-8 年估计值。P. richardsoni 的高最大年龄和相应的低自然死亡率与澳大利亚南部沿海水域的五角类动物相似。来自塔斯曼海的 P. richardsoni 的生长趋势表明，该物种在生命的前 4-5 年表现出快速生长，在其漫长的生命的剩余时间里几乎没有或没有随后的生长，这与其他五角类动物相似。P 的长度和年龄的截断。沃尔特斯浅滩的 Richardsoni 表明，这些水域中该物种的种群比塔斯曼海豪勋爵海隆地区的种群经历了更高的捕捞死亡率，这一点也得到了前者更高的总死亡率估计数的证实。P. richardsoni 的这些发现，以及 NPO 中的 P. Wheeleri 种群仍未从 1960 年代后期至 1970 年代中期持续的高捕捞死亡率中恢复的知识，应该为南半球 P. richardsoni 的管理策略提供信息。