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題 名 | A Study of the Characteristics of Fish Shoals in Coastal Waters of Northeast Taiwan Using an Echo-Signal Image Processing System=利用聲探影像處理系統分析臺灣東北部沿海魚群群集特性之研究 |
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作 者 | 李國添; 呂學榮; 廖正信; | 書刊名 | 臺灣水產學會刊 |
卷 期 | 23:3 1996.09[民85.09] |
頁 次 | 頁181-193 |
分類號 | 439.2 |
關鍵詞 | 聲探; 魚群; 數位影像處理; Hydroacoustics; Fish shoals; Digital image processing; |
語 文 | 英文(English) |
中文摘要 | 本研究於1991、1992及1993年之夏季於本省東北部沿海進行聲探計測,利用自行 開發之聲探影像處理系統(EIPS)擷取與魚群內、外部結構有關之說明變量,將實驗期間所擷 取之2,301組魚群說明變量進行主成份分析及群集分析,藉以瞭解魚之群集特性,主成份分 析之結果顯示,魚群結構之年度別及日夜別差異不若地域別者顯著,分佈於淺水域之魚群群 集密度較深水域者低,而且在等深線20米及70米附近有較高之魚群出現率。群集分析之結 果顯示,1991年之探測海域可魚群群聚特性的不同區分為4個聲訊族群,1992及1993年則 各可區分為5個聲訊族群。各個聲訊族群分別佔據不同的海域區塊,且棲息之魚濾有顯著的 差異,其中兩個區塊主要棲息魚種為鱹、?及珊瑚礁魚類,另二及三個區塊之主要棲息魚種 則為鰹、?、白帶魚及鎖管等,此外,各區塊之水深、底質特性也各不相同。 |
英文摘要 | Hydroacoustic data collected from the summers of 1991, 1992 and 1993 were analyzed to characterize fish shoals in the coastal waters of northeast Taiwan. The computer software were designed to measure descriptors related to internal and external characterisitics of the shoals. A total of 2, 031 sets of shoal data were analyzed by the principal components and the hierarchical classification methods. The annual and diurnal differences were less significant that differences among depths. Reiatively high occurrence of fish shoals was found around depths of 20 m and 70 m. Fish shoals at depths less that 45 m deep were of lower echo intensity than those in deeper waters. Four acoustic populations were recognized in 1991 and five in 1992 and 1993, which occupied different regions of the study area, likely representing different ecological zones. Two regions were dominated by anchovy, sardine and reeffishes. The other two or three regions were dominated by skipjack, horse mackerel, hairtail and squid. The sedimantal and topographical characteristics were significantly different among the four and five regions. |
本系統中英文摘要資訊取自各篇刊載內容。