Indirect estimation of contact selectivity for gill nets using hierarchical models

Data used to indirectly estimate contact selectivity for experimental gillnets using walleye catches in Lake Erie as a case study. Specifically, two different configurations of experimental gill nets were fished throughout Lake Erie's western and central basins during 2007-2008 and 2011-2013. Most notably, these gear configurations differed in construction material (monofilament vs. multifilament mesh) and mesh sizes present (monofilament range = 1.5 to 7.0 inch stretch measure in 0.5 inch increments; multifilament range = 2.0 to 5.0 inch stretch measure in 0.25 inch increments), but also in other aspects such has twine diameter, too (see specific details in Vandergoot et al. 2011; Kraus et al. 2017).Data are organized into a series of individual tabs that contain set-specific abiotic information (abiotic_data), set-specific walleye catch data with length and weight observations for individual fish (raw_catch_data), summarized catches of walleye by 25-mm length bins for each mesh size present across all net sets for each gear configuration (mono_pooled_catch_data; multifilament_pooled_catch_data), catches of walleye by 25-mm length bins for each mesh size present for individual net sets for each gear configuration (mono_set_catch_data; multi_set_catch_data), and set-specific covariates used to explore correlations with estimated parameter deviations (covariates). Specific details for each tab's contents can be found in the data_dictionary tab.All R code used in analyses present in Faust et al. (2025) can be found online at https://github.com/faustmd/hierarchical_selectivity.<b>Literature cited</b>Faust, M.D., T.O. Brenden, and C.L. Cahill. <i>Accepted</i>. Indirect estimation of contact selectivity for gill nets using hierarchical models. Canadian Journal of Fisheries and Aquatic Sciences.<br>Kraus, R.T., C.S. Vandergoot, P.M. Kocovsky, M.W. Rogers, H.A. Cook, and T.O. Brenden. 2017. Reconciling catch differences from multiple fishery independent gill net surveys. Fisheries Research 188: 17-22.Vandergoot, C.S., P.M. Kocovsky, T.O. Brenden, and W. Liu. 2011. Selectivity evaluation for two experimental gill-net configurations used to sample Lake Erie walleyes. North American Journal of Fisheries Management 31: 832-842.<br><br><br><br><br>

本数据集以伊利湖（Lake Erie）白斑梭鲈（walleye）的捕获数据为案例，用于间接估算实验刺网（experimental gillnets）的接触选择性（contact selectivity）。
具体而言，2007-2008年与2011-2013年间，研究人员在伊利湖西部及中部湖区布设了两种不同配置的实验刺网进行捕捞采样。
两种刺网配置最显著的差异在于网片材质与网目尺寸：单丝网衣（monofilament mesh）的网目拉伸尺寸范围为1.5至7.0英寸，以0.5英寸为增量递增；复丝网衣（multifilament mesh）的网目拉伸尺寸范围为2.0至5.0英寸，以0.25英寸为增量递增。此外，二者在网线直径等其他参数上亦存在区别（详细参数可参见Vandergoot等人2011年、Kraus等人2017年的研究文献）。
数据集以多个独立工作表的形式组织，各工作表包含内容如下：
1. abiotic_data：各捕捞站位的非生物环境信息
2. raw_catch_data：各捕捞站位的白斑梭鲈捕获原始数据，包含单尾鱼类的体长与体重观测值
3. mono_pooled_catch_data、multifilament_pooled_catch_data：按25毫米体长组汇总的、对应每种网目尺寸下所有站位的白斑梭鲈捕获量（分两种刺网配置）
4. mono_set_catch_data、multi_set_catch_data：按25毫米体长组汇总的、对应每种网目尺寸下各单站位的白斑梭鲈捕获量（分两种刺网配置）
5. covariates：用于探究与估算参数偏差相关性的站位专属协变量
各工作表的具体内容细节可查阅data_dictionary工作表。
Faust等人2025年研究中所用的全部分析代码，可在线获取：https://github.com/faustmd/hierarchical_selectivity.

### 参考文献
1. Faust, M.D., T.O. Brenden, 与 C.L. Cahill. 已录用. 基于层级模型（hierarchical models）间接估算刺网接触选择性. 《加拿大渔业与水产科学杂志》（Canadian Journal of Fisheries and Aquatic Sciences）
2. Kraus, R.T., C.S. Vandergoot, P.M. Kocovsky, M.W. Rogers, H.A. Cook, 与 T.O. Brenden. 2017. 调和多种渔业独立刺网调查的捕捞差异. 《渔业研究》（Fisheries Research）188: 17-22.
3. Vandergoot, C.S., P.M. Kocovsky, T.O. Brenden, 与 W. Liu. 2011. 用于采样伊利湖白斑梭鲈的两种实验刺网配置的选择性评估. 《北美渔业管理杂志》（North American Journal of Fisheries Management）31: 832-842.