California halibut hook and line commercial fishing grounds for the port of Half Moon Bay in the year 2010

This data set is a part of Ecotrust's project entitled: Establishing a Baseline and Assessing Initial Spatial and Economic Change in the California North Central Coast Commercial Fisheries. This project is a component of the California North Central Coast Marine Protected Area Baseline Monitoring Project that is designed to characterize the ecological and socioeconomic conditions and changes within the North Central Coast Region since MPA implementation. The North Central Coast study region extends from the north at Alder Creek to the south at Pigeon Point. This data set consists of data collected in the summer of 2011 from fisheries mapping interviews conducted with commercial fishermen who had California halibut—hook and line landings in the California North Central Coast in 2010. During interviews fishermen were asked to map their fishing grounds for 2010 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 California halibut—hook and line fishery in 2010. 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 2010 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 California halibut—hook and line commercial fishing grounds for the port of Half Moon Bay in the year 2010.

本数据集为生态信托（Ecotrust）项目的组成部分，该项目标题为《建立加利福尼亚中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中北海岸海洋保护区基线监测项目的子项目，旨在刻画该区域自海洋保护区（Marine Protected Area, MPA）实施以来的生态与社会经济状况及变化。加利福尼亚中北海岸研究区域北起阿尔德溪（Alder Creek），南至鸽子角（Pigeon Point）。本数据集的数据采集自2011年夏季开展的渔业测绘访谈，访谈对象为2010年在加利福尼亚中北海岸有加州庸鲽（California halibut）钩钓（hook and line）渔获上岸记录的商业渔民。访谈环节要求渔民绘制其2010年的作业渔场，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。访谈获取的空间数据经聚合流程整合：将每位渔民给出的加权作业渔场，再依据其2010年在该加州庸鲽钩钓渔业中的船边交货营收（ex-vessel revenue）进行二次加权，最终生成对应各港口的该渔业空间数据集。对于区域级或全港口数据集，则基于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2010年该渔业的总船边交货营收为权重，对港口级数据进行聚合。本数据集代表了2010年半月湾（Half Moon Bay）港口对应的加州庸鲽钩钓商业作业渔场的空间范围与相对价值。