Study on the Bycatch of Shrimp Trawl Fishery in the Waters of Kaoping Canyon

台灣高屏峽谷周邊海域蝦拖網漁業之混獲研究

吳金鎮(Chin-Cheng Wu) ； 歐慶賢(Ching-Hsiewn Ou)

《臺灣水產學會刊》 36卷1期 (2009/03) Pp. 63-75

https://doi.org/10.29822/JFST.200903.0005

摘要

高屏峽谷周邊海域為我國重要的蝦拖網漁場，計有四種蝦拖網漁業（正櫻蝦中層拖網、中型毛蝦中層拖網、底層蝦拖網及桁桿式蝦拖網）在此作業。本研究針對此四種漁業的混獲實況進行調查，其結果如后。四種漁業的混獲比例為65.85~93.78%，以桁桿式蝦拖網混獲比例最高，其餘三種漁業皆在76.3%以下。在四大混獲類別中，四種漁業皆以魚類的混獲比例最高(44.71~60.56%)。四種漁業混獲與目標漁獲比為1.93~15.08，以桁桿式蝦拖網最高，其餘三種漁業皆在3.3以下，正櫻蝦及中型毛蝦中層拖網混獲最多的種類為白帶魚，底層蝦拖網為小鰭鐮齒魚，桁桿式蝦拖網為曳絲鑽嘴魚。將四種漁業前五種混獲種類的混獲比例合計，大多在50%以上。正櫻蝦中層拖網混獲種數175種，中型毛蝦中層拖網120種，底層蝦拖網136種，桁桿式蝦拖網149種，四種漁業混獲種類合計高達347種，而總漁獲種類有379種。

關鍵字

高屏峽谷 ； 蝦拖網 ； 混獲 ； 棄獲

並列摘要

The waters around Kaoping Canyon is an important fishing ground for shrimp trawl fishery in Taiwan. There were four shrimp trawl fisheries operating in this areas namely, the sergestid shrimp mid-trawl, planktonic shrimp mid-trawl, bottom shrimp trawl and shrimp beam trawl. This study was carried out to investigate the bycatch status in situ of these four shrimp trawl fisheries. The bycatch rate were from 65.85% to 93.77% for these four shrimp trawl fisheries. The shrimp beam trawl fishery had the highest bycatch rate while those of the other three shrimp fisheries were less than 76.3%. Among the top four categories of bycatch, the fish was the dominant bycatch in the four shrimp fisheries (44.71-60.56%). The ratios of bycatch to target species were 1.93-15.08 for the four shrimp fisheries. The shrimp beam trawl fishery had the highest ratio and those of the others were less than 3.3. The major bycatch species of sergestid shrimp mid-trawl and planktonic shrimp mid-trawl was Trichiurus lepturus, while the Harpadon microchir and Gerres filamentosus were the main bycatch species for bottom shrimp trawl and shrimp beam trawl, respectively. The top five bycatch species occupied over 50% of the whole bycatch amount of the four shrimp trawl fisheries. A total of 175, 120, 136 and 149 species were caught by sergestid shrimp mid-trawl, planktonic shrimp mid-trawl, bottom shrimp trawl and shrimp beam trawl, respectively. A total of 347 and 379 species were bycatch species and total catch species, respectively.

並列關鍵字

Kaoping Canyon ； Shrimp trawl fishery ； Bycatch ； Discards