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

為了解台灣東北部沿岸海域圓花鰹仔魚成長的空間差異，於2009年夏季在3個河口域以海建號試驗船使用丸氏仔魚網進行水表層水平拖曳來採集仔魚樣本，再用耳石日周輪來解析其日齡和成長率。在花蓮溪口捕獲之仔魚的體長為 2.2-7.1 mm、日齡為 5-15 天、日齡體長關係式為BL (mm) = 2.2 + 0.3 D (BL: 體長, D: 日齡, r²=0.73, n=50)；在得子口溪口捕獲的體長為 3.5-7.0 mm、日齡為 5-10 天、BL = 1.3 + 0.5 D (r²=0.43, n=30)；在蘭陽溪口捕獲的體長為 3.9-6.9 mm、日齡為 7-14 天、BL =3.0 + 0.2 D (r²=0.68, n=30)。顯然地，圓花鰹仔魚的體長、日齡、孵化體長和成長率有地區間的差異。相關性分析結果顯示，海水表層溫度和磷酸鹽濃度是造成差異的因子。

To clarify the spatial difference of growth rates of the larval Auxis rochei in the coastal waters off northeastern Taiwan, the larvae were collected by horizontal tows with Maruchi-D larval net by R/V Hai-chien at the sea surface of 3 estuaries in daytime in summer of 2009. Based on the analysis of daily increments in the otoliths, frequency of body lengths, daily ages, growth rates and length at hatching of the larvae were different among estuaries. The body lengths, daily ages, and age-length keys of the larvae were 2.2-7.1 mm, 5-15 days and BL (mm) = 2.2 + 0.3 D (BL, body length; D, daily age; r² =0.73; n=50) that caught from the Hualian Estuary; were 3.5-7.0 mm, 5-10 days and BL = 1.3 + 0.5 D (r²=0.43, n=30) that from the Dezikou Estuary; were 3.9-6.9 mm, 7-14 days and BL = 3.0 + 0.2 D (r²=0.68, n=30) that from Lanyan Estuary. Pearson’s correlation coefficients indicated that the differences were caused by the temperature and concentrations of phosphate in the sea surface of these estuaries.