Kate M. Seinor , Hamish A. Malcolm , Kirsten Benkendorff , Stephen D.A. Smith , Robert G. Creese , Steven W. Purcell
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Temperate snails attained a larger asymptotic size than subtropical snails (108 mm vs 94 mm), a greater growth coefficient (<em>K</em>) (0.57 y⁻<sup>1</sup> vs 0.29 y⁻<sup>1</sup>), a higher rate of natural mortality (<em>M</em> = 0.57 y⁻<sup>1</sup> vs 0.37 y⁻<sup>1</sup>) and shorter lifespan (<em>T</em><sub>max</sub> = 5 years vs 10 years). Sexual maturity (37 mm, 95 % CI: 35–39 mm) was attained by temperate snails at 0.7 years (range: 0.7–0.8 years), allowing ∼1.5 years before entering the fishery. In contrast, subtropical snails reach sexual maturity at 1.7 years (range: 1.6–1.8 years), having ∼4.4 years before reaching the harvestable size. Our findings indicate that current minimum legal-size limits are appropriate across the fishery for ensuring population replenishment. Yet, climate change may impact the growth pattern of <em>T. militaris</em>. The fast-growth and shorter lifespan of temperate snails suggests greater resilience to environmental stressors due to higher population turnover. In contrast, subtropical snails likely have slower population recovery, reflecting greater vulnerability to stressors or depletion by overfishing.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107521"},"PeriodicalIF":2.3000,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Latitudinal variation in age and growth of a harvested, rocky-reef gastropod (Turbinidae)\",\"authors\":\"Kate M. Seinor , Hamish A. Malcolm , Kirsten Benkendorff , Stephen D.A. Smith , Robert G. Creese , Steven W. Purcell\",\"doi\":\"10.1016/j.fishres.2025.107521\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>In Australia, the military turban <em>Turbo militaris</em> Reeve 1848 is culturally, commercially and recreationally fished. Fishery regulations include a bag limit of 20 snails and a minimum legal-size limit of 75 mm. Yet, there is limited biological knowledge to inform management. Mark−recapture surveys were used to assess growth and develop age-and-growth models for <em>T. militaris</em> at two subtropical (29.4 °S and 29.8 °S) and two temperate (both 32.7 °S) rocky shores in eastern Australia. Growth varied between subtropical and temperate regions separated by < 400 km. Temperate snails attained a larger asymptotic size than subtropical snails (108 mm vs 94 mm), a greater growth coefficient (<em>K</em>) (0.57 y⁻<sup>1</sup> vs 0.29 y⁻<sup>1</sup>), a higher rate of natural mortality (<em>M</em> = 0.57 y⁻<sup>1</sup> vs 0.37 y⁻<sup>1</sup>) and shorter lifespan (<em>T</em><sub>max</sub> = 5 years vs 10 years). Sexual maturity (37 mm, 95 % CI: 35–39 mm) was attained by temperate snails at 0.7 years (range: 0.7–0.8 years), allowing ∼1.5 years before entering the fishery. In contrast, subtropical snails reach sexual maturity at 1.7 years (range: 1.6–1.8 years), having ∼4.4 years before reaching the harvestable size. Our findings indicate that current minimum legal-size limits are appropriate across the fishery for ensuring population replenishment. Yet, climate change may impact the growth pattern of <em>T. militaris</em>. The fast-growth and shorter lifespan of temperate snails suggests greater resilience to environmental stressors due to higher population turnover. 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引用次数: 0
摘要
在澳大利亚,军用头巾Turbo militaris Reeve 1848被用于文化、商业和娱乐用途。渔业法规定,一袋蜗牛不得超过20只,法定尺寸不得超过75 毫米。然而,对管理人员来说,生物学知识是有限的。在澳大利亚东部的两个亚热带(29.4°S和29.8°S)和两个温带(均为32.7°S)岩石海岸,采用Mark - recapture调查方法评估了军斑蝽的生长情况,并建立了年龄和生长模型。亚热带和温带地区的生长差异为<; 400 km。温带蜗牛的渐近体型比亚热带蜗牛大(108 mm vs 94 mm),生长系数(K)更大(0.57 y毒血症vs 0.29 y毒血症),自然死亡率更高(M = 0.57 y毒血症vs 0.37 y毒血症),寿命更短(Tmax = 5年vs 10年)。温带螺在0.7年(范围:0.7 - 0.8年)达到性成熟(37 mm, 95% % CI: 35-39 mm),在进入渔场之前有~ 1.5年的时间。相比之下,亚热带蜗牛在1.7年(范围:1.6-1.8年)达到性成熟,在达到可收获的大小之前需要~ 4.4年。我们的研究结果表明,目前的最低法定尺寸限制是适当的,以确保整个渔业的人口补充。然而,气候变化可能会影响军蹄草的生长模式。温带蜗牛的快速生长和较短的寿命表明,由于较高的种群周转率,它们对环境压力的适应能力更强。相比之下,亚热带蜗牛的种群恢复速度可能较慢,这反映出它们更容易受到压力或过度捕捞造成的枯竭的影响。
Latitudinal variation in age and growth of a harvested, rocky-reef gastropod (Turbinidae)
In Australia, the military turban Turbo militaris Reeve 1848 is culturally, commercially and recreationally fished. Fishery regulations include a bag limit of 20 snails and a minimum legal-size limit of 75 mm. Yet, there is limited biological knowledge to inform management. Mark−recapture surveys were used to assess growth and develop age-and-growth models for T. militaris at two subtropical (29.4 °S and 29.8 °S) and two temperate (both 32.7 °S) rocky shores in eastern Australia. Growth varied between subtropical and temperate regions separated by < 400 km. Temperate snails attained a larger asymptotic size than subtropical snails (108 mm vs 94 mm), a greater growth coefficient (K) (0.57 y⁻1 vs 0.29 y⁻1), a higher rate of natural mortality (M = 0.57 y⁻1 vs 0.37 y⁻1) and shorter lifespan (Tmax = 5 years vs 10 years). Sexual maturity (37 mm, 95 % CI: 35–39 mm) was attained by temperate snails at 0.7 years (range: 0.7–0.8 years), allowing ∼1.5 years before entering the fishery. In contrast, subtropical snails reach sexual maturity at 1.7 years (range: 1.6–1.8 years), having ∼4.4 years before reaching the harvestable size. Our findings indicate that current minimum legal-size limits are appropriate across the fishery for ensuring population replenishment. Yet, climate change may impact the growth pattern of T. militaris. The fast-growth and shorter lifespan of temperate snails suggests greater resilience to environmental stressors due to higher population turnover. In contrast, subtropical snails likely have slower population recovery, reflecting greater vulnerability to stressors or depletion by overfishing.
期刊介绍:
This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.