白蝦稚蝦在不同波長色光環境之趨光行為研究

Abstract

本研究利用蝦類可能具有趨光行為之特性，探討對四種波長可見光、三種照度、四種不同放養密度等之趨光行為研究。比較藍光(442nm)、綠光(525nm)、黃光(590nm)及紅光(639nm)等四種色光、三種不同照度(100lux、500lux、1000lux)和四種不同放養密度(50、100、200、400 尾/m²)，了解其趨光性，作為養殖工程設計的參考。可據以設計棲息環境，吸引未脫殼蝦聚集，減少脫殼蝦被殘食的機率，間接提高白蝦存活率。 實驗水溫 25℃、純海水，將四種光源架設於水族缸上方的四個角落，缸底中間以黑色遮罩減少各光源干擾，利用高速攝影機記錄白蝦稚蝦的聚集行為，以20分鐘內的觀察，整理每隔2 分鐘的分布狀況數據。每個實驗模組可整理得10 組數據，計算各光源各照度之面積比及稚蝦聚集密度。 結果顯示，白蝦稚蝦最喜愛聚集的環境為照度10lux 以上，喜愛色光為紅光，且不受本研究四種密度影響。至於底部活動難易程度會造成白蝦趨光行為的差異。 以上結果，可作為後續在戶外蝦池，為減少脫殼蝦損傷之現地試驗設計依據。

This study use phototaxis of white shrimp which attracts shrimp without moltingand reduces them to attack shrimp in molting, so that we can design aculture environment following the habitats of white shrimp to reduce cannibalism of shrimp, and indirectly improve shrimp survival. In this study , we use four color light which blue (442nm), green (525nm), yellow (590nm) and red (639nm) light, three illuminance which 100lux、500lux、1000lux, and four stocking density which 50、100、200、400 pieces / m² to conduct phototaxis experiment of white shrimp. Four kinds of light sources sets in corner of the aquarium with water temperature 25℃ and seawatwr environment, and bottom of the aquarium sets a black mask to reduce the various light source of interference ,and use high-speed camera to record the behavior of juvenile shrimp within 20 minutes, calculated each 2 minutes data and the area of each of illumination light source and juvenile shrimp packing density. The results show that juvenile white shrimp favorite gathered in illuminance range of light over 10 lux environment,and juvenile white shrimp favorite color light is red light, and density of white shrimp don’t influence result of the red light. And the results show that state is not very crowded,and show that the bottom of the easiness of activities will result in differences in phototaxis of white shrimp. These results can be used an experiment to design at outdoor ponds, and to reduce the current experimental evidence of shelling shrimp injury.