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Comparison of Four Hard Structures Including Otoliths for Estimating Age in Blue Suckers
Transactions of the American Fisheries Society ( IF 1.4 ) Pub Date : 2021-02-22 , DOI: 10.1002/tafs.10303
Dakota S. Radford 1 , Alec R. Lackmann 2 , Cassi J. Moody‐Carpenter 1 , Robert E. Colombo 1
Affiliation  

The Blue Sucker Cycleptus elongatus is an imperiled North American catostomid in need of management and protection. No hard structures are validated for aging this species, but past studies focused on somatic structures such as fin rays and scales. Calculated parameters (mortality, recruitment, growth) that inform management decisions are directly influenced by the accuracy and precision of the hard structure used to estimate age. We identify the most precise and credible structure with which to age Blue Suckers while also completing the first in-depth investigation of their otoliths. We collected Blue Suckers (n = 168) from the lower Wabash River and compared ages estimated from scales, opercles, pectoral fin rays, and lapillus otoliths but were unsuccessful in estimating ages from cleithra. We identified structure bias between all structures and found scales (n = 67; maximum = 11 years, mean = 8.2 years) and opercles (n = 65; maximum = 15 years, mean = 8.3 years) to be substantially less precise than pectoral fin rays and lapillus otoliths. We found that otoliths (n = 128; maximum = 42 years, mean = 13.5 years) were more precise than fin rays (n = 167; maximum = 20 years, mean = 9.6 years) and yielded a much higher range of ages. We could not identify any range of ages or total lengths in which (nonlethal) fin ray age could be accurately corrected to (lethal) otolith age. Thin-sectioned otoliths are the gold standard for aging most fishes, including numerous age-validated catostomids, and the credibility of Blue Sucker otolith age estimates was additionally supported by a strong correlation between whole lapillus mass and estimated age (R2 = 0.89). Overall, evidence indicates that Blue Sucker lapillus otoliths yield more precise and credible age estimates than other hard structures.

中文翻译:

包括耳石在内的四种硬结构用于估计蓝吸盘年龄的比较

Blue Sucker Cycleptus elongatus是一种需要管理和保护的濒危北美catstomid。没有证实该物种老化的硬结构,但过去的研究集中在体细胞结构上,如鳍条和鳞片。为管理决策提供信息的计算参数(死亡率、招聘、增长)直接受到用于估计年龄的硬结构的准确性和精确度的影响。我们确定了最精确、最可靠的结构,用于使 Blue Suckers 老化,同时还完成了对其耳石的首次深入调查。我们收集了 Blue Suckers ( n = 168) 来自下游的 Wabash 河,并比较了从鳞片、鳃盖、胸鳍条和 lapillus 耳石估计的年龄,但未能成功估计来自 cleithra 的年龄。我们确定了所有结构之间的结构偏差,并发现尺度(n  = 67;最大值 = 11 年,平均值 = 8.2 年)和鳃盖(n  = 65;最大值 = 15 年,平均值 = 8.3 年)远不如胸鳍精确射线和耳石耳石。我们发现耳石(n  = 128;最大值 = 42 年,平均值 = 13.5 年)比鳍条(n = 167; 最大值 = 20 岁,平均值 = 9.6 岁)并且产生了更大的年龄范围。我们无法确定任何年龄范围或总长度,其中(非致死性)鳍射线年龄可以准确地校正为(致死性)耳石年龄。薄切耳石是大多数鱼类老化的黄金标准,包括许多经过年龄验证的 catostomids,蓝吸盘耳石年龄估计的可信度还得到了整个 lapillus 质量和估计年龄之间的强相关性的支持 ( R 2  = 0.89)。总体而言,有证据表明 Blue Sucker lapillus 耳石比其他硬结构产生更精确和可信的年龄估计。
更新日期:2021-02-22
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