To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1 Comparison of circadian locomotion activity between zebrafish and catfish. This video is played at 5x faster speed. Establishing simple image-based methods and a cost-effective instrument for toxicity assessment on circadian rhythm dysregulation in fish Gilbert Audira, Bonifasius Putera Sampurna, Stevhen Juniardi, Sung-Tzu Liang, Yu-Heng Lai, Liwen Han, and Chung-Der Hsiao Biology Open 2019. 8:None-None; doi: 10.1242/bio.041871 Download Original Video