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題名 | The Effects of Fish-Shrimp Separator on Catches in Taiwanese Shrimp Drag Net=臺灣近海蝦拖網裝設魚蝦分離器對漁獲物之影響 |
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作者 | 陳俊德; 林佑信; 林佳宏; 林山章; | 書刊名 | 臺灣水產學會刊 |
卷期 | 27:2 2000.06[民89.06] |
頁次 | 頁77-88 |
分類號 | 439.3 |
關鍵詞 | 逃脫率; 選擇性; 攻角; 魚蝦分離器; 臺灣近海蝦拖網; Escape ratio; Selectivity; Attack angle; Fish-shrimp separator; Taiwanese shrimp drag net; |
語文 | 英文(English) |
中文摘要 | 為究明蝦拖網加裝魚蝦分離器(fish-shrimp separator)對蝦拖網魚蝦漁獲的衝擊, 乃於蝦施網具上結降柵條間隔30mm之魚蝦分離器,於臺灣北部漁垤進行魚蝦分離之漁獲實 驗。實驗果如下:(1)本試驗之漁獲魚種有28種,蝦類有6種,優勢漁獲物為劍蝦,但並未 有海龜的混獲。(2)與囊網漁獲相比,在小袋網內之漁獲體長範圍較寬且平均體長較大。且隨 著魚蝦分離器攻角之增加,小袋網內之漁獲體長範圍增寬,而囊網內之漁獲體長範圍則變窄。 (3)與魚蝦分離器攻角30°及60°之漁獲相比,於45°時劍蝦及厚殼蝦之逃脫率最低。對蝦拖網而 言,魚蝦分離器最佳之攻角為45°,此時,蝦類漁獲尾數約減少8%-8.6%、魚類漁獲尾數約 減少31%-89.5%。(4)當魚蝦分離器之攻角增加,魚蝦分離器對蝦類及魚類之選擇性隨之減 少,而蝦類及魚類之選擇性曲線形狀有明顯差異。(5)因大部分之幼稚魚蝦被本研究所設計之 魚蝦分離器所捕獲,為求海洋資源的永續利用,後續之研究須設計一種可保護幼稚魚蝦逃脫 之魚蝦分離器。 |
英文摘要 | To study the impacts of fish-shrimp separator catches of shrimp drag fishery, a field experiments were carried out in the northern fishing grounds of Taiwan during May and August in 1995. The results are summarized as follows: (1)28 species of fishes and 6species of shrimps were caught but a by-catch of turtle was not found. The dominant species of catch is Parapenaeopsis hardwickii. (2)The body length ranges in pocket are wider thatn the ranges in codend and the average body length is bigger as well. The body length range of catches in codend tends to be declining with the increasing of attack angle of fish-shrimp separator from 30° to 60°. (3)The escape ratios for Parapenaeopsis hardwickii and Metapeneopsis barbata are the maximum as attack angle is 45° indicating that fish-shrimp separator worked best at this angle. After adjusting the fish-shrimp separator to a 45° attack angle, the reduction ratio for shrimp was 8%-8.6% and fish 31%-89.5%. (4)When the attack angle of fish-shrimp separator is increasing, the selectivity on fish and shrimp is declining relatively. (5)Because the fish-shrimp separator used in this study captured most of the juvenile, it is required to design a new type of fish-shrimp separator to protect the juvenile. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。