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頁籤選單縮合
題 名 | Tracking of Japanese Eel Anguilla Japonica by Ultrasonic Transmitter in the Southwestern Waters of Taiwan=以超音波技術追蹤日本鰻之洄游行動 |
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作 者 | 郭慶老; 中村朗; 塚本勝已; 鈴木敬二; 廖一久; | 書刊名 | 臺灣水產學會刊 |
卷 期 | 23:4 1996.12[民85.12] |
頁 次 | 頁279-287 |
分類號 | 388.491 |
關鍵詞 | 日本鰻; 追蹤; 超音波發射器; 移動; Japanese eel; Tracking; Ultrasonic transmitter; Movement; |
語 文 | 英文(English) |
中文摘要 | 為瞭解日本鰻之降河洄游行動,1994年1月26日∼29日將超音波發射器裝在 5尾裡人工催熟之種鰻(平均體重1,044g,全長83.3cm)體上,於台灣西南部之小琉球海域 放流後追蹤其洄游行動。其中2尾游向東南方,另2尾則游向西北方,洄游之方向與放流點 當時之海流流向幾乎一致。剩餘1尾在放流後的5分鐘內即失去信號。 追蹤結果,發現其游動距離為490m∼750m,平均為658m。平均游泳速度為0.48∼40.1 m/sec,但個體間之差異不大。由上述之結果推測種其在放流後可能立即潛入海底之洞穴中 藏匿,然後再慢慢進出洞穴活動。 |
英文摘要 | Artificially induced maturing Japanese eels, Anguilla japonica, were released in southwestern waters of Taiwan on 26-28 January 1994, and tracked with ultrasonic transmitter to collect informations on the spawning migration of this species. Among five eels tagged with identical transmitters, different type of signals, pulse length and frequency, two specimens moved southeastward (137.2°), while the other two swam northwestward (328.4°and 347.0°). The direction of movement, except No. 5 specimen, coincided with the tidal currents of release time and location. The last eel (No. 5) was lost 5 minutes after release because of a rapid movement. Northwestward movement of the eel might be explained as a preference for deeper waters, just as observed in European eel. The distance between the release point and the end of tracking ranged from 490m to 750m. Mean swimming speed during tracking ranged from 0.5 to 40.1 cm/sec. The changes in strength and direction of the signals indicated that the eels seemed to swim downward to the sea bottom just after the release and might be moving in and out of a "shelter" or "hole" at the bottom. Once the eel dived and reached the bottom, they might move little either horizontally or vertically. |
本系統中英文摘要資訊取自各篇刊載內容。