Lobster—trap commercial fishing grounds, Ventura, 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 Ventura 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 Ventura in the year 2012.

本数据集为Point 97项目的组成部分，该项目标题为《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），南至加利福尼亚与墨西哥边境。
本数据集的数据采集于2013年夏季，来源于对2012年在文图拉（Ventura）有龙虾笼渔获上岸记录的商业渔民开展的渔业制图访谈。访谈环节中，受访者被要求绘制其2012年的作业渔场，并通过将100个权重份额分配至各作业渔场，以此量化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：将每位渔民提供的作业渔场权重，再按照其2012年龙虾笼捕捞渔业的船边渔获收入（ex-vessel revenue）进行二次加权。该流程为每个港口生成了对应渔业的空间数据集。对于区域级或全港口数据集，则依据加州鱼类与野生动物部（California Department of Fish and Wildlife）的商业渔获上岸数据，以各港口2012年该渔业的总船边渔获收入为权重，完成港口层级数据的聚合。
本数据集表征了2012年文图拉地区龙虾笼商业捕捞渔场的空间范围与相对价值。