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頁籤選單縮合
題名 | Quantitative Extimation of Zooplankton and Micronekton Biomass Using A High-Frequency Acoustic Method=利用高頻聲探評估浮游動物及微游泳動物生體量之研究 |
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作者姓名(中文) | 呂學榮; 李國添; 廖正信; | 書刊名 | 臺灣水產學會刊 |
卷期 | 21:2 1994.06[民83.06] |
頁次 | 頁139-155 |
分類號 | 439 |
關鍵詞 | 超音波迅捷評估法; 聲探回訊影像處理; 浮游動物; 微游泳動物; Acoustic quick assessment method; Echo signal image processing; Zooplankton; Microneton; |
語文 | 英文(English) |
中文摘要 | 本研究利用420KHz之聲探系統在本省東北部沿岸漁場進行探測,以影像處理法將浮游動物以及微游泳動物外之信號濾除,並利用二階段回訊積分法計算各水層修正後之平均體積散亂反射強度Svadj值(dB/m3)。聲探計測時並實施現垤之浮游生物網採集,以採集所得之生常種類組成、豐度、密度等資料,與聲探回訊積分資料比對,探聲探評估法直接推測浮游生物豐度的可行性。結果顯示本研究發展之聲探回訊信號處理法可去除魚類之反射回訊,擷霰屬於浮游動物及微游泳動物之反射回訊。若浮游動物及微游泳動物的散亂層中之魚類信號未予以濾除,則聲探積分法所評估之生體量平均約高估7.39倍。網具採集顯示水層中之主要反射主體為橈腳類及磷蝦類,其平均標物反射強度差異極大,且對420KHz聲波之反射座落在不同的反射特性區。 |
英文摘要 | A 420 KHz echo sounding system was used to conduct acoustic surveys in the coastal waters of northeastern Taiwan. A two-step echo-integration method, that included the echo signal image processing method developed for this study as the second integration, was used to obtain the average adjusted volume backscattering strength for each echo-integration unit. In the acoustic surveys, IKMT and Norpac samplers were used to collect biological samples simultanecously to identify the species and size compositions and to estimate the biomass of zooplankton and micronekton. The acoustic data were compared to the biological data to determine the feasibility of using the two-step echo-integration method in estimating the biomass of ooplankton and micronekton. The results indicated that the echo signal image processing method developed in this study removed most signals oringinated from fish, as well as all those other than from zooplankton and micronekton. When the scattering layer of zooplankton and micronkekton was obscured by fish echo signals, echo-integration without the image processing method caused 7.39 times overestimation of the zooplankton biomass. In the sound scattering layer composed of copepods or euphausiids as dominant species group, it's a average target strength differed significantly, and its response to sound waves was in different geometric, transition or Rayleigh scattering region. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。