台湾海峡南部灯光围网捕捞的水温选择及其季节变化

对1989－1998年台湾海峡南部渔场生产记录资料分析结果表明：灯光围网捕捞主要捕捞年适宜水温16．1－30℃，年较佳水温20．1－30℃，年最佳选择水温21．2－29℃。环境水温过高或过低，不利于灯光围网生产。各季度的选择水温，冬季为21．2－24℃，春季为21．1－27℃，夏季为26．1－29℃，秋季为25．1－28℃；各月选择水温为该月环境水温的中间值至偏高2℃，多数比中间值偏高1－2℃。选择水温范围的宽幅3－5℃；随环境水温升高或降低，鱼类对水温选择发生同的、同步的变化，是一种渐进的过程；在环境水温上升或持续高温，温跃层存在、底层低温涌升水强盛的条件下，灯光围网的作业效率均受影响。

Selective water temperature and its seasonal variation for light-seine fishing in southern Taiwan Strait

According to the information of light-seine fishing in the southern Taiwan Strait from 1989～1998, the result indicated that annual suitable temperature is 16.1～30℃ for light-seine fishing, 20.1～30℃ for annual better temperature, 21.1～29℃ for annual better selective temperature. If water temperature is higher or lower, it is not advantageous to light-seine fishing. The selective temperature for light-seine is 21.1～24℃ in winter, 21.1～27℃ in spring, 26.1～29℃ in summer and 25.1～28℃ in autumn. In various months selective temperature for fishing is the median temperature in that month or is higher 2℃ than the median temperature, higher 1～2℃ mainly. Variable range of selective temperature is 3～5℃. Fish keep up same direction and range with temperature variety in temperature selection. It is affected by press of temperature and is a progressive process. Fishing efficiency of light-seine is affected by water temperature rising, continue higher temperature, larger temperature gradient, thermocline or the strong upwelling with lower temperature in bottom.