Age and growth of Argyrozona argyrozona (Pisces: Sparidae) in a marine protected area: an evaluation of methods based on whole otoliths, sectioned otoliths and mark-recapture
Age and growth of Argyrozona argyrozona (Pisces: Sparidae) in a marine protected area: an evaluation of methods based on whole otoliths, sectioned otoliths and mark-recapture
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DOI：
10.1016/j.fishres.2003.08.007
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发表时间：
2004-03
影响因子：
2.4
通讯作者：
S. Brouwer;M. Griffiths
中科院分区：
文献类型：
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作者：
S. Brouwer;M. Griffiths
银鳕鱼是南非商业性延绳钓渔业的重要组成部分。本研究的目的是开发一种可靠的方案来估计年龄和计算生长。基于耳石和标记重捕数据的方法进行了研究。从Tsitsikamma国家公园（TNP）的横向矢状面显示出清晰的不透明和半透明的生长增量。边缘生长区的分析和标记，化学标记的鱼（土霉素）的再捕获显示，这些沉积在每年的基础上：不透明的夏季和半透明的冬季。通过每日增量计数显示第一次半透明检查，以标记第一个环的完成（即，不是幼稚/错误检查）。在读者（计数之间）和读者之间的平均百分比误差（APE）分别为5.3和1.8，表明木匠耳石的可读性很高。整体耳石与切片耳石的比较表明，整体耳石显著低估了10龄以上鱼类的年龄（P<0.01）。完整耳石的最大年龄为16岁，耳石切片的最大年龄为27岁。基于实际L∞估计和残差分布，三参数von Bertalanffy生长函数能较好地拟合耳石切片的年龄时长数据。两种性别之间的生长率无显著差异（f=2.217，P=0.09）。TNP中木匠的生长由以下方程描述：[公式：见正文]大部分（68%）来自标记重捕数据的个体生长率低于基于耳石的von Bertalanffy生长模型的预测值（P<0.01）。这是由于外部标签的负面影响，因为水螅虫，经常发生在标签上的重新捕获的鱼，观察到造成严重的病变，在某些情况下，广泛的鳍损伤。这使人们对使用标记-再捕获研究来计算某些物种的增长产生了疑问。
Argyrozona argyrozona is an important component of the South African commercial linefishery. The purpose of this study was to develop a reliable protocol for estimating age and calculating growth. Methods based on both otoliths and mark-recapture data were investigated. Transverse sagittal sections from the Tsitsikamma National Park (TNP) showed clear opaque and translucent growth increments. Marginal growth zone analysis and mark-recapture of chemically tagged fish (Oxytetracycline) revealed that these were deposited on an annual basis: opaque in summer and translucent in winter. The first translucent check was shown by daily increment counts to mark the completion of the first annulus (i.e. not a juvenile/false check). Within reader (between counts) and between readers average percentage error (APE) was 5.3 and 1.8, respectively, showing that readability of carpenter otoliths is high. Comparison between whole and sectioned otoliths showed that the former significantly underestimated the age of fish older than 10 years (P<0.01). The maximum age obtained from whole otoliths was 16 years while that obtained from otolith sections was 27 years. Based on realistic L∞estimate and the distribution of residuals, the three parameter von Bertalanffy growth function adequately fitted the observed length-at-age data derived from otolith sections. Growth rates did not differ significantly between sexes (f=2.217, P=0.09). Growth of carpenter in the TNP is described by the following equation: [Formula: see text] A large proportion (68%) of the individual growth rates derived from mark-recapture data were below those predicted by the otolith based von Bertalanffy growth model (P<0.01). This was attributed to the negative influence of external tags as hydroids, frequently occurring on the tags of recaptured fish, were observed to cause severe lesions and in some cases, extensive fin damage. This brings into question the use of mark-recapture studies to calculate growth of some species.