頁籤選單縮合
題名 | 臺灣東北海域產天竺舵魚及蘭勃舵魚於單層及三層刺網之選擇性與漁獲效能 =Catching Efficiency and Selectivity of Gill Nets and Trammel Nets on Kyphosus cinerascens and Kyphosus lembus from Northeastern Waters off Taiwan |
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作者 | 賴繼昌; 謝寬永; Lai, Chi-chang; Hsieh, Kuan-yung; |
期刊 | 水產研究 |
出版日期 | 20090600 |
卷期 | 17:1 2009.06[民98.06] |
頁次 | 頁1-14 |
分類號 | 439.2 |
語文 | chi |
關鍵詞 | 單層刺網; 三層刺網; 選擇性; Gill net; Trammel net; Selectivity; |
中文摘要 | 本研究於2001年6月及2002年之6、7月間,在澳底沿岸,使用7.8 ~ 12.5 cm等五種不同網目大小之單層刺網,及內網10.4 cm,外網30.5 cm之三層刺網,進行天竺舵魚 (Kyphosus cinerascens) 及蘭勃舵魚 (K. lembus) 之選擇性實驗。研究結果得知,以8.7 cm目大之單層刺網對兩種目標魚種之選擇性及漁獲效果最佳。單層刺網中,漁獲方式大部分以刺入及嵌入為主,三層刺網則以纏絡為主。由單層及三層刺網之漁獲資料,可證實單層刺網之選擇性較三層刺網明顯。以Holt、Kitahara及修正Sechin式等三種方法推估網目選擇性,估計各網目對天竺舵魚及蘭勃舵魚之最適漁獲體長為22.6 ~ 37.1 cm間。其中天竺舵魚之選擇係數 (SF) 值為2.90,蘭勃舵魚為2.97。在盛漁期,若網目選用得當,單層刺網對目標魚種之漁獲效果及整體漁獲效益較三層刺網佳,但三層刺網對於非目標魚種之漁獲效果則較單層刺網佳,獲利亦較好。故在盛漁期間,應選擇最適切之單層刺網網目 (8.7 cm) 作業,以減少環境及資源的破壞,並兼顧漁獲收益。 |
英文摘要 | In this study, five gill nets mesh sizes (7.8, 8.7, 10.0, 10.8 and 12.5 cm) and one trammel net (inner 10.4 cm, outer 30.5 cm) were compared to estimate catching selectivity and efficiency for Kyphosus cinerascens and K. lembus along the coast of Auo-di from June to July in 2001 and 2002. Results showed that the 8.7 cm-mesh-size gill net was the most efficient net to catch that two species. In gill nets, mostly caught fishes were gilled or wedged. In the trammel net, fishes however were caught by tangling. This indicated that the trammel net was less selectivity on fish size. In addition, the selectivity of mesh size was assessed through Holt, Kitahara, and revised Sechin methods. The estimated optimum selection lengths of K. cinerascens and K. lembus were various from 22.6 to 37.1 cm, depending on mesh sizes. The selection factor for K. cinerascens was 2.90, and K. cinerascens was 2.97. The gill nets caught were target species than trammel net, but trammel net had more non-target species than gill nets. In IPUE analysis, the gill net with mesh size 8.7 cm has the highest income. The study suggested that gill net with mesh size 8.7 cm should be considered to use during the fishing season. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。