魚隻現況之時空監測與應用

Spatial-Temporal Monitoring of Fish Characteristics and their Applications

應用水下聲學遙測技術，以達到海床底質描繪與整合生態資訊的目的，將有助於海床生態系的理解與資源的永續經營。本研究在於應用底床固定型掃描式聲納系統進行水域影像資料收集，以期達到解決魚隻解析度（偵測、辨識、尺度與類別）、空間尺度（游牧型或地域型）、時間尺度（日行性、夜行性或微光性）、掃描時間（以長時間或24小時為基準）以及對魚隻的干擾（船隻載具與儀器噪音）等議題的目的。根據於馬公港區進行的測試結果顯示：於探測半徑為50m的圓形區域內，魚隻集中區域以些微突起之底床區域為主，寬度達20m。局部富集區域以位於此區的明顯突起型人工物體為主。魚隻之移動與局部匯聚情形呈現以覓食為主體的行為模式。本研究所列舉之方法與結果，對於海域工程位址（例如：人工魚礁區、離岸風電場址以及海底管線區域）之生態監測作業，能夠提供定量化資料以供評估。

The application of underwater acoustical surveying techniques for the evaluation of both seafloor morphology and biological characteristics is valuable for the understanding of underwater ecosystem and the sustainable resources management. The purpose of this investigation was dedicated in the utilization of bottom-fixed scanning sonar system for the characterization of spatial-temporal and bio-physical coupling of fish and their environment. Based on a testing investigation, with scanning radii of 50m, conducted at Makung port, fish were tended to accumulate at specific, extruded artificial objects. The swimming route and the accumulated area of these fish illustrated a prominent behavior related to foraging activities.
The procedure and results illustrated in this trial investigation indicated that the proposed technique is helpful in monitoring and evaluation of offshore construction site for the purpose of environmental influence evaluation and ecosystem monitoring.