Figure 4.

(a) Dive profile with occurrence of jaw motion events (JME; green dots) and the start of video recording. The video recorder recorded for approximately 5 minutes from 08:34:00 on 15 March 2013 (latitude: 44.7050, longitude: −130.3989, sea floor depth: 2200 m). Colored dots on the enlarged dive profile indicate how the seal responded to the fish: captured (green) and captures not confirmed (red). Because of the narrow angle of video vision (about 25 degrees) and the weak light source, only part of the fish appeared in the video footage, but the fish were identified as sections of ragfish by comparing body morphological features with an adult ragfish specimen (inset picture; body length 135 cm) preserved at Kanagawa Prefectural Museum of Natural History which was caught in a set net (depth: 120 m) off the coast of Hayakawa near Odawara City, Kanagawa, Japan, in 1999. (b) Posture of fish immediately before the seal's attack. Fish appeared in the video footage in a variety of postures, for example, dorsal side down (upper image), dorsal side up downward, and lying on the side (lower image). (c) Sequence of video frames right before a seal attack (7 frames). The fish did not show any escape response, keeping its dorsal side down posture until right before the seal attack, suggesting that fish had limited reactivity in the OMZ