Market squid—seine commercial fishing grounds, San Pedro, 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 South Coast Commercial Fisheries. This project is a component of the California South Coast Marine Protected Area Baseline Monitoring Project that is designed to characterize the ecological and socioeconomic conditions and changes within the South Coast Region since MPA implementation. The South Coast study region extends from the north at Point Conception to the south at the California/Mexico border. This data set consists of data collected in the summer of 2013 from fisheries mapping interviews conducted with commercial fishermen who had market squid—seine landings in San Pedro in 2012. During interviews fishermen were asked to map their fishing grounds for 2012 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 market squid—seine fishery in 2012. 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 2012 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 market squid—seine commercial fishing grounds for San Pedro in the year 2012.

本数据集隶属于Point 97项目，该项目主题为：建立加利福尼亚南海岸商业渔业基线并评估其初始空间与经济变化。本项目为加利福尼亚南海岸海洋保护区基线监测项目（California South Coast Marine Protected Area Baseline Monitoring Project）的组成部分，旨在刻画南海岸地区自海洋保护区（Marine Protected Area，MPA）实施以来的生态与社会经济状况及变化。本次研究的南海岸区域北起康塞普申角（Point Conception），南至美墨边境加州段。本数据集包含2013年夏季开展的渔业测绘访谈数据，访谈对象为2012年在圣佩德罗港有市场鱿鱼围网捕捞上岸量的商业渔民。访谈过程中，受访渔民需绘制其2012年的捕捞作业海域，并通过将100枚便士分配至各作业海域的方式，标定各捕捞海域的相对重要性。随后，通过聚合流程整合本次访谈获取的空间数据：将每位渔民给出的加权捕捞海域权重，再以其2012年市场鱿鱼围网渔业的船边交货收入（ex-vessel revenue）进行二次加权，由此生成针对该渔业各港口的空间数据集。若需构建区域级或全港口数据集，则需依据加州鱼类与野生动物部（California Department of Fish and Wildlife）的商业上岸量数据，按照2012年该渔业各港口的总船边交货收入对港口级数据进行加权聚合。本数据集对应2012年圣佩德罗港市场鱿鱼围网商业捕捞海域的空间范围与相对价值。