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題 名 | The Assessment of Fish Abundance at Shallow Water Using a Hydroacoustic System Incorporated with an Underwater Stereo Camera System=利用光學聲學連動系統評估淺水域魚群量之研究 |
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作 者 | 吳龍靜; | 書刊名 | 臺灣水產學會刊 |
卷 期 | 18:2 1991.06[民80.06] |
頁 次 | 頁117-131 |
分類號 | 439.3 |
關鍵詞 | 光學; 淺水域; 魚量; 聲學; |
語 文 | 英文(English) |
中文摘要 | 本論文旨在敘述一套光學聲學連動系統之編成,並在核一廠冷?水進水口進行其實用可行性之實驗,於日本鮆(Engraulis japonica)漁期,利用系統之魚?探測。指令部確認魚?回訊並立即拍攝一組立體照片,而魚?回訊同步收錄在磁帶中,在實驗室中由成對之立體照片,一則得以判釋魚?回訊之對象魚種,再則可以計算出日本鮆魚?內各單體魚之相對空間座標,從而求得魚?之平均密度(ρ, Fish/m3), 與經由魚?回訊積分法推定該瞬間日本鮆魚?之平均後方散亂反射強度(Sv, dB)的直線回歸關係為:Sv=-57.6+9.8log(ρ) (R=0.86)主以此做為日本鮆定量計測之校準因子,顯示日本鮆在冷卻水口超音波幕內之生體量(P, 公斤)與遭受撞擊魚?量(I, 公斤)之關係為:I=0.06P+1.17 (R=0.99)實驗結果顯示本系統可補充光學測定及聲學測定之不足,適於淺水域魚?量之評估。 |
英文摘要 | This paper describes a hydroacoustic system incorporated with an underwater stereo camera system which was developed for fish abundance estimation in shallow waters. Field experiment was carried out in the fishing period of Engraulis japonica at cooling water intake of Nuclear Power Plant I, Taiwan. The fish within the effective picture-taking range of the camera was verified by hydroacoustic survey and a pair of three-dimensional pictures were taken immediately. Then, species identification and packing density (ρ, fish/m3) of fish could be derived by stereo photograph analysis in laboratory. The average backscattering strength (Sv, dB) of photographed fish school could also be obtained by integration method. The relationship of these two factors were: Sv=-57.6+9.8log(ρ) (R=0.86)By using this equation as a scaling factor, biomass (P, Kg) of Engraulis japonica in the insonified volume can be obtained. Together with the impinged quantity (I, Kg) collected at the collect basket, the relationship of these two factors were: I=0.06P+1.17(R=0.99). This results indicate that the coupled systes is feasible for estimating the abundance of fish school impinged by the cooling water intake. |
本系統中英文摘要資訊取自各篇刊載內容。