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題名 | Catch Estimation Using Acoustic Data Obtained from Research Vessel's Routine Surveys in the Coastal Waters of Northern Taiwan=以研究船日常調查勤務蒐集之聲探資料估計臺灣北部沿岸漁獲量 |
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作者姓名(中文) | 蔡尚航; 廖正信; 呂學榮; | 書刊名 | 臺灣水產學會刊 |
卷期 | 36:1 2009.03[民98.03] |
頁次 | 頁1-13 |
分類號 | 439.22 |
關鍵詞 | 聲探計測; 臺灣北部沿海; 漁業現存量獨立指標; 魚探; Acoustic survey; Coastal zone of northern Taiwan; Fishery independent index; Echosounder; |
語文 | 英文(English) |
中文摘要 | 本研究整合海研二號研究船1999-2003年於台灣北部沿岸所蒐集37航次之Simrad EK500科學魚探資料,以建立監測該區總生物量變動之方法。將各航次不一致之探測路徑上之各項聲探參數以兩浬網格化。再計算體積散亂反射強度平均值(SV),藉以分析海域生物之相對密度。全海域之SV分布顯示,歷年各航次4~9月均較同年10~3月高出1.5~12.6dB,五年總平均則高出5.7dB,顯示研究地區生物量有明顯的季節變異。全海域之SV與沿岸漁業總漁獲量呈正相關(r=0.8849, p<0.01)。因此,經後處理後之研究船日常調查勤務蒐集之EK500聲探資料,可用來做為當漁獲資料缺乏時之漁業資源現存量的獨立指標。 |
英文摘要 | In this study, we compiled data of 37 acoustic surveys (1999-2003) collected by the Ocean Researcher Ⅱ using Simrad EK500 scientific echosounder to establish a method to monitor total standing stock variation in the coastal waters of northern Taiwan. All acoustic data of different transects in each survey were aggregated into 2 nm ×2 nm grids, then average volume backscattering strengths (SV) of each grid were calculated to estimate relative density of marine organism. The SV values of the entire surveyed area from April to September were 1.5-12.6 dB higher than those from October to March, and 5.7 dB higher than the 5-year average. These differences suggested that there were strong seasonal variabilities of standing stock in the surveyed area and the SV values of the entire surveyed area were positively correlated with the total catches of coastal fisheries (r=0.8849, p<0.01). Therefore, the post-processed acoustic data collected by the research vessel can be used as fishery independent indices when there is shortage of fisheries catch data. |
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