農業部-水產試驗所全球資訊網農業部-水產試驗所全球資訊網

為瞭解臺灣周邊海域花鰹屬 (Genus: Auxis) 仔稚魚之時空分布，本研究於 2007 ~ 2009年 間按季於 62 個測站採集溫鹽、營養鹽、葉綠素甲、浮游動物及仔稚魚樣本。11 個航次共採得花鰹屬仔稚魚 909 尾，其豐度分布存在明顯的季節變化，春季，仔稚魚大量出現在臺灣海峽與東北部海域，平均豐度為 32 ind./1000 m3；夏季，仔稚魚自東北部海域經臺灣海峽直至西南海域均密集地出現，東部沿岸處亦有分布，平均豐度為 39 ind./1000 m3。主成分分析結果顯示，春季時水溫較低處，葉綠素甲濃度、浮游動物及花鰹屬仔稚魚豐度也較高；夏季時，水溫較低處，營養鹽類及葉綠素甲濃度較高，浮游動物及花鰹屬仔稚魚豐度也較高。相關分析亦顯示，春季及夏季時花鰹屬仔稚魚豐度與水溫存在顯著之負相關關係。綜上所述，春、夏兩季花鰹屬仔稚魚的豐度受周邊海域環境因子影響而有獨特的分布形式，而秋、冬兩季因非屬產卵季節僅有零星分布。

In order to understand the spatial and temporal distribution of larval bullet tuna (genus: Auxis) in the waters around Taiwan, 11 cruises to 62 sampling stations were conducted from 2007 through 2009 to collect larval fish and measure various environmental factors. A total of 909 larvae were collected using an ORI net. The abundance of Auxis larvae showed seasonal variations. In the spring, Auxis larvae were found in the Taiwan Strait and northeastern waters, and the average abundance was 32 ind./1000 m3. In the summer, the average abundance was 39 ind./1000 m3, and the Auxis larvae were widely distributed, ranging from the northeastern waters to the southwestern waters off Taiwan and also being observed in eastern waters in coastal regions. Principal components analysis showed that the levels of chlorophyll-a, zooplankton and Auxis larvae were high in areas with lower water temperatures during spring. During the summer, the levels of nutrients, chlorophyll-a, zooplankton and Auxis larvae were also high in areas with lower water temperature. Correlation analysis also showed that the abundance of Auxis larvae was negatively correlated with water temperature in spring and summer. In conclusion, the distinctive distribution of Auxis larvae in the spring and summer was profoundly influenced by the environmental factors, and autumn and winter were not the breeding season for the fish.