Age validation in horse mackerel (Trachurus trachurus) otoliths
Age validation in horse mackerel (Trachurus trachurus) otoliths
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竹荚鱼 (Trachurus trachurus) 耳石的年龄验证
DOI：
10.1006/jmsc.2001.1071
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发表时间：
2001
影响因子：
4.5
通讯作者：
M. Kerstan
中科院分区：
文献类型：
--
作者：
M. Waldron;M. Kerstan
使用两种方法来验证竹荚鱼耳石的年龄测定。首先，用光学显微镜检查整个耳石。通过识别和计算年轮来确定年龄。还测量了边缘增量宽度并用于估计年龄，范围为 0.6-4.3 岁。在第二种方法中，用扫描电子显微镜检查耳石，并通过每日增量计数确定鱼的年龄。通过计算每日生长增量，对来自东南大西洋的 64 个耳石样本和来自东北大西洋的 24 个耳石样本进行了老化。每个生长区内每日增量的数量差异很大。第一个年生生长带的年龄超过365天，表明某些鱼类并不总是沉积第一个年生生长环。第一年生长区日增量计数的变化可能与竹荚鱼产卵季节非常漫长有关。对后续生长区的检查表明，假环和环通常具有相似的视觉外观，并且只有在可以同时测量生长区宽度的情况下才能识别真正的环。估计年龄与通过计算每日增量得出的年龄一致，从而验证了竹荚鱼的年龄可达四年。 2001 国际海洋探索理事会
Two methods were used to validate age determination of horse mackerel otoliths. In the first, whole otoliths were examined with a light microscope. Age was determined by identifying and counting annuli. Marginal increment widths were also measured and served to estimate ages, which ranged from 0.6–4.3 years. In the second method, otoliths were examined with a scanning electron microscope and fish ages were determined by daily increment counts. Sixty-four otolith specimens from the Southeast Atlantic and 24 from the Northeast Atlantic were aged by counting the daily growth increments. The number of daily increments was highly variable within each growth zone. Ages exceeding 365 days in the first annual growth zone indicated that the first annulus was not always deposited in some fish. The variable daily increment counts in the first year’s growth zones may be related to the very protracted spawning season of horse mackerel. Examination of subsequent growth zones indicated that false rings and annuli are often of a similar visual appearance and that true annuli can only be identified if concurrent measurements of growth zone widths are available. Estimated ages agreed with ages derived by counting daily increments, thus validating the ages of horse mackerel up to four years. 2001 International Council for the Exploration of the Sea