MLPA North Coast Monitoring - Crescent City - nearshore finfish-live hook-and-line - 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 nearshore finfish-live hook-and-long landings in the port of Crescent City 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 nearshore finfish-live hook-and-long 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 nearshore finfish-live hook-and-line commercial fishing grounds for the port of Crescent City in the year 2013.

本数据集为Point 97项目的组成部分，该项目题为《建立加利福尼亚北海岸商业渔业基线并评估其初始空间与经济变化》。本项目是加利福尼亚北海岸海洋保护区（Marine Protected Area, MPA）基线监测项目的子项目，旨在刻画北海岸地区自海洋保护区实施以来的生态、社会经济状况及其变化。本次研究的北海岸区域范围北起俄勒冈州与加利福尼亚州州界，南至阿德勒溪（Alder Creek），该地点位于阿雷角（Point Arena）北侧。本数据集包含2014年夏季开展的渔业制图访谈所采集的数据，访谈对象为2013年在新月城港（Crescent City）有近岸硬骨鱼活捕钩钓与延绳捕捞上岸记录的商业渔民。访谈中，渔民需标注其2013年的捕捞作业海域，并通过将100个权重单位分配至各捕捞海域，以此确定各海域的相对重要性。随后，通过聚合流程整合本次访谈获取的空间数据：先对每位渔民提供的加权捕捞海域进行二次加权，加权依据为该渔民2013年在近岸硬骨鱼活捕钩钓与延绳捕捞渔业中的船边渔获收入。由此生成该渔业各对应港口的空间数据集。针对区域级或全港口级数据集，则依据加利福尼亚州鱼类与野生动物部（California Department of Fish and Wildlife, CDFW）的商业上岸数据，以各港口2013年该渔业的总船边渔获收入为权重，对港口级数据进行聚合整合。本数据集呈现了2013年新月城港近岸硬骨鱼活捕钩钓商业捕捞海域的空间范围与相对价值。