Lobster—trap commercial fishing grounds, San Diego, 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 lobster—trap landings in San Diego 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 lobster—trap 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 lobster—trap commercial fishing grounds for San Diego in the year 2012.

本数据集为Point 97项目的组成部分，该项目题为《建立加州南海岸商业渔业基线并评估其初始空间与经济变化》。本项目是加州南海岸海洋保护区（Marine Protected Area, MPA）基线监测项目的组成部分，旨在表征自海洋保护区实施以来，南海岸区域的生态与社会经济状况及其变化。南海岸研究区域北起康塞普申角（Point Conception），南至加州与墨西哥边境。本数据集涵盖2013年夏季开展的渔业测绘访谈所采集的数据，访谈对象为2012年在圣地亚哥有龙虾笼渔获上岸记录的商业渔民。访谈期间，渔民需绘制其2012年的作业渔场分布图，并通过向各渔场分配100枚便士的方式，明确各渔场的相对重要性。随后，研究人员通过聚合流程整合本次访谈获取的空间数据：将每位渔民提供的加权渔场数据，进一步以其2012年龙虾笼渔业的上岸收入（ex-vessel revenue）进行加权，由此生成该渔业对应各港口的空间数据集。对于区域级或全港口数据集，则依据加州鱼类与野生动物局（California Department of Fish and Wildlife）的商业渔获上岸数据，以各港口2012年该渔业的总上岸收入为权重，对港口级数据进行聚合整合。本数据集表征了2012年圣地亚哥地区龙虾笼商业渔场的空间范围与相对价值。