Monitoring of reef fish abundance in the Tsitsikamma National Park using stereo-BRUVs

Stereo-BRUVs were deployed in Tsitsikamma National Park to monitor reef fish abundance and measure fish lengths. The resultant records of sampling events, underwater videos, fish occurrences and fish lengths constitute this dataset. Videos were analysed using EventMeasure (SeaGIS) to record MaxN and length values. See Bernard et al. (2014). DwC Event Core: A parent sampling event represents an event that took place at a named location, where a number of child sampling events (videos) were undertaken. DwC Occurrence Extension: An occurrence record represents a species observed in a particular 60-minute video, specifically the MaxN, or largest number of individuals of this species observed in a single frame. DwC Extended Measurement or Fact Extension: Each record represents an individual fish, specifically the individual's length as measured using EventMeasure. DwC Audubon Media Description: Each record represents a child sampling event's video file (video files are not available online but can be requested).立体诱饵水下视频采样器（Stereo-BRUVs）被部署于齐齐卡马国家公园，用于监测礁鱼种群丰度并测定鱼类体长。本次数据集由采样事件记录、水下视频、鱼类出现记录及鱼类体长测量数据共同构成。研究人员采用EventMeasure（SeaGIS开发）对视频进行分析，以记录最大个体数（MaxN）与体长数据，相关方法详见Bernard等人（2014）的研究。DwC事件核心（Darwin Core Event Core）：父级采样事件代表在指定地点开展的一次完整采样活动，该活动下包含若干子级采样事件（即本次采集的水下视频）。DwC出现扩展（Darwin Core Occurrence Extension）：单条出现记录对应一段特定60分钟视频中观测到的某一物种，具体记录该物种在单帧画面中观测到的最大个体数（MaxN）。DwC扩展测量与事实扩展（Darwin Core Extended Measurement or Fact Extension）：每条记录对应一尾个体鱼类，具体记录通过EventMeasure测得的该个体体长。DwC奥杜邦媒体描述（Darwin Core Audubon Media Description）：每条记录对应一个子级采样事件的视频文件（视频文件未在线公开，可申请获取）