Fig. 1. Setup for three-dimensional video analysis. For close viewing, two low-light CCD cameras were positioned to cover (with overlap) the front of the tank (TF, top front; BF, bottom front), and one CCD camera (CCD=SIDE) and a video camera with night-vision device (NVD) and infrared barrier filter in tandem recorded movement and luminescence, respectively, from the side. The image panel box at the lower right indicates the image partitioning of the recordings.