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頁籤選單縮合
題名 | 長期漁業開發下黃鰭鮪個體成長之比較= |
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作者 | 李存富; 王健雄; 葉裕民; |
期刊 | 臺灣海洋學刊 |
出版日期 | 19951200 |
卷期 | 34:4 1995.12[民84.12] |
頁次 | 頁43-60 |
分類號 | 439.24 |
語文 | chi |
關鍵詞 | 黃鰭鮪; 年齡查定; Yellowfin tuna; Age-determination; |
中文摘要 | 本研究以鱗片作為年齡查定的形質,目的在探討最近臺灣近海釣漁業主要漁獲魚 種黃鰭鮪的年齡與成長的情形,並與以往的研究結果相比較,藉以瞭解臺灣沿近海域內的黃 鰭鮪,經過二十多年來的強力開發之後,是否已對於個體的成長造成影響。 結果顯示:(a)黃鰭鮪的年輪形成期已有提早的跡象,(b)平均年輪徑增大,主要發生於 幼齡期,即第一年輪徑的成長明顯的較大所致,(c)主要漁獲體長較大。 推究其原因,除了標本的體長範圍不同以及漁場改變所可能造成的影響之外,並不排除 多年來由於漁業的強力開發的結果,使資源的密度降底使成長的條件轉佳,導致個體成長的 加快與以及成熟期的提前有關,尤其是幼齡期成長的明顯加快所造成的影響。 |
英文摘要 | Scales were used in the research of age and growth of yellowfin tuna caught in the waters adjacent to the south of Taiwan. Results were compared to those published by Huang and Yang (1974). It revealed that: (a)Rings on scale were formed twice a year; one in February to April, and the other one in August to October. It implied that the time of ringformation is earlier than those reported by Huang and yang (1974). (b)Generally, scale-radii were larger than those reported by Huang and Yang (1974), especially in the first ring radius. It implied that the juvenile of yellowfin tuna seems have a better growth than those in 1970s. (c)The mode of length frequency were larger than those reported by Huang and Yang (1974). It also implied that the growth of yellowfin tuna are commonly better than those in 1970s. CPUE of yellowfin tuna are decreased significantly sine 1970s, hence the more rapid growth of individuals may be relating to the lower population density. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。