Lobster—trap 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 lobster—trap 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 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 Pedro in the year 2012.

本数据集为Point 97项目的组成部分，该项目题为《建立基线并评估加利福尼亚南海岸商业渔业的初始空间与经济变化》。本项目是加利福尼亚南海岸海洋保护区（Marine Protected Area, MPA）基线监测项目的子项目，旨在刻画自MPA实施以来南海岸区域内的生态与社会经济状况及其变化。本次南海岸研究区域北起康塞普西翁角（Point Conception），南至美墨边境的加利福尼亚州段。本数据集包含2013年夏季开展的渔业绘图访谈所采集的数据，访谈对象为2012年在圣佩德罗（San Pedro）港有龙虾笼渔获上岸的商业渔民。访谈期间，受访者需绘制2012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：将每位渔民提供的加权作业渔场，再以其2012年龙虾笼捕捞业的渔获离岸收入进行二次加权。由此生成该渔业各港口的空间数据集。针对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局的商业渔获上岸数据，以各港口2012年该渔业的总渔获离岸收入为权重，聚合港口级数据。本数据集刻画了2012年圣佩德罗港龙虾笼商业捕捞作业渔场的空间范围与相对价值。