MLPA North Coast Monitoring - Eureka - Salmon - troll - Post MPA

This data set is a part of Point 97's project entitled: Establishing a Baseline and Assessing Initial Spatial and Economic Change in the California North Coast Commercial Fisheries. This project is a component of the California North Coast Marine Protected Area Baseline Monitoring Project that is designed to characterize the ecological and socioeconomic conditions and changes within the North Coast Region since MPA implementation. The North Coast study region extends from the north at Oregon/California border to the south at Alder Creek, just north of Point Arena. This data set consists of data collected in the summer of 2014 from fisheries mapping interviews conducted with commercial fishermen who had Salmon - troll landings in the port of Eureka in 2013. During interviews fishermen were asked to map their fishing grounds for 2013 and determine the relative importance of each fishing ground by allocating 100 pennies across their fishing grounds for this fishery. The spatial data from these interviews were then combined through an aggregation process where the weighted fishing grounds each fisherman gave were further weighted by their ex-vessel revenue from the Salmon - troll fishery in 2013. This created spatial data sets for each port for this fishery. For regional or all port data sets, port level data was aggregated by weighting each port by the port’s total ex-vessel revenue in 2013 for the fishery based on California Department of Fish and Wildlife commercial landings data. This data set represents the spatial extent and relative value of Salmon - troll commercial fishing grounds for the port of Eureka in the year 2013.

本数据集隶属于Point 97项目，该项目主题为《加利福尼亚北海岸商业渔业基线构建与初始空间、经济变化评估》。本项目为加利福尼亚北海岸海洋保护区（Marine Protected Area, MPA）基线监测项目的组成部分，旨在刻画北海岸区域自海洋保护区实施以来的生态与社会经济状况及其变化。本次研究的北海岸范围北起俄勒冈州与加利福尼亚州边境，南至阿德勒溪（Alder Creek），该区域位于阿雷纳角（Point Arena）以北。本数据集包含2014年夏季开展的渔业绘图访谈采集的数据，访谈对象为2013年在尤里卡港（Eureka）有鲑鱼曳绳钓（Salmon-troll）上岸渔获的商业渔民。访谈期间，渔民需绘制2013年的作业渔场分布图，并通过将100枚便士分配至各作业渔场的方式，明确各渔场的相对重要性。随后通过聚合流程整合本次访谈获取的空间数据：先为每位渔民提供的作业渔场赋予初始权重，再以其2013年鲑鱼曳绳钓渔业的船边营收对该权重进行二次加权，由此生成该渔业对应各港口的空间数据集。若需生成区域级或全港口数据集，则基于加利福尼亚州鱼类与野生动物部（California Department of Fish and Wildlife）的商业上岸渔获数据，以各港口2013年该渔业的总船边营收为权重，对港口级数据进行聚合整合。本数据集呈现的正是2013年尤里卡港鲑鱼曳绳钓商业作业渔场的空间范围与相对价值。