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Proposed Standard Weight (Ws) Equation and Length Categories for Utah Chub
North American Journal of Fisheries Management ( IF 1.1 ) Pub Date : 2021-06-25 , DOI: 10.1002/nafm.10636
Aaron R. Black 1 , Zachary S. Beard 2 , Jon M. Flinders 3 , Michael C. Quist 4
Affiliation  

Condition indices, such as relative weight (Wr), provide a simple method for comparing length–weight relationships among populations. However, no standard weight (Ws) equation has been developed for Utah Chub Gila atraria, a species of important management focus in the Intermountain West. We obtained length–weight data for 30,541 Utah Chub from 24 populations in Idaho, Montana, Utah, and Wyoming. We used the regression line percentile (RLP), linear empirical percentile (EmP), and quadratic EmP methods to develop average (50th percentile) and above average (75th percentile) Ws equations. Additionally, Froese’s method was used to develop another Ws equation for Utah Chub. Length-related biases were detected in Ws equations developed using the RLP, 50th percentile quadratic EmP, and Froese methods. The linear EmP Ws equations did not exhibit length-related biases for the 50th and 75th percentiles. We propose using the 75th percentile linear EmP Ws equation for Utah Chub between 90 and 410 mm TL. The EmP 75th percentile equation was log10(Ws) = −4.938 + 3.031·log10(TL), where Ws is weight in grams and TL is in millimeters. The English equivalent of this equation is log10(Ws) = −3.335 + 3.031·log10(TL), where Ws is weight in pounds and TL is in inches for 4–16-in Utah Chub. Additionally, we propose that minimum TLs of 100 mm (4 in; stock), 200 mm (8 in; quality), 250 mm (10 in; preferred), 300 mm (12 in; memorable), and 380 mm (15 in; trophy) be used to calculate proportional size distribution (PSD) indices. Better understanding Utah Chub populations using Wr and PSDs will aid managers in assessing management strategies (e.g., biological controls) focused on Utah Chub.

中文翻译:

为 Utah Chub 提议的标准重量 (Ws) 公式和长度类别

条件指数,例如相对权重 ( W r ),为比较种群之间的长度-权重关系提供了一种简单的方法。然而,尚未为犹他州 Chub Gila atraria开发标准重量 ( W s ) 方程,这是 Intermountain West 的一种重要管理重点。我们从爱达荷州、蒙大拿州、犹他州和怀俄明州的 24 个种群中获得了 30,541 条犹他州鲢鱼的身长-体重数据。我们使用回归线百分位数 (RLP)、线性经验百分位数 (EmP) 和二次 EmP 方法来开发平均(第 50 个百分位数)和高于平均水平(第 75 个百分位数)的W s方程。此外,Froese 的方法被用来开发另一个W s 犹他州丘布的方程。在使用 RLP、第 50 个百分位二次 EmP 和 Froese 方法开发的W s方程中检测到与长度相关的偏差。对于第 50 个和第 75 个百分位数,线性 EmP W s方程没有表现出与长度相关的偏差。我们建议对90 到 410 毫米 TL 之间的犹他州 Chub使用第 75 个百分位数的线性 EmP W s方程。EmP 第 75 个百分位数方程为 log 10 ( W s ) = -4.938 + 3.031·log 10 (TL),其中W s是以克为单位的重量,TL 以毫米为单位。此等式的英文等效项是 log 10 ( W s) = −3.335 + 3.031·log 10 (TL),其中W s是以磅为单位的重量,TL 是以英寸为单位的 4-16 英寸犹他州鲢鱼。此外,我们建议最小 TL 为 100 毫米(4 英寸;库存)、200 毫米(8 英寸;质量)、250 毫米(10 英寸;首选)、300 毫米(12 英寸;易于记忆)和 380 毫米(15 英寸) ;奖杯)用于计算比例尺寸分布(PSD)指数。使用W r和 PSD更好地了解 Utah Chub 种群将有助于管理人员评估以 Utah Chub 为重点的管理策略(例如,生物控制)。
更新日期:2021-06-25
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