高屏峽谷海域減少拖網漁業混獲以提升資源保育之研究(三)
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- 109年11月21日
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年度 2007 計劃名稱 高屏峽谷海域減少拖網漁業混獲以提升資源保育之研究(三) 中文摘要 本研究以高屏峽谷海域作業混獲比例高之底層蝦拖網為對象，為避免該漁業混獲過多影響本海域魚類資源，採取以漁具結構做適當之調整，於漁民原來使用兩袋網前加一硬式圓形內置過濾桿框架，在其後則加一較細網目之外袋網，測量其脫逃比例，並以流水活魚艙檢測其脫逃魚類之存活比率。經6航次23網次試驗結果，以圓形框架過濾桿，不論其橫置或縱置，間距是17或19 mm，對大型魚類均可引導其游往上袋網，主要對象蝦類則進入內袋網。其脫逃之魚類及蝦類游往上袋網之存活率較高，進入外袋網之存活率則普遍不高。 英文摘要 In order to avoid the high bycatch rate which influenced the fish resources around Kaoping Canyon water caused by the shrimp beam trawls， this study， therefore， was focused on the structure modification of fishing gear for reducing its high bycatch rate. This study was prompted to add both harden circle-frame with filter-rods and much smaller mesh of outer codend at the anterior of traditional codend for measuring the escape rate. In addition， the running-water tank was used to examine the survival rate of escaped fish. A total of six voyages were carried out during this research period. The results indicated that the circle-frame with filter-rods (17mm or 19mm interval) whatever put in transverse or vertical position could conduct the large size fish into upper codend and main target， shrimp into inner codend. The escaped fish or shrimp which moved into the upper codend had a higer survival rate while had a lower rate for outer codend. 計畫編號 96農科-15.1.1-漁-F2(4)