Fish Population and Behavior Revealed by Instantaneous Continental Shelf–Scale Imaging
Nicholas C. Makris, Purnima Ratilal, Deanelle T. Symonds, Srinivasan Jagannathan, Sunwoong Lee, Redwood W. Nero

Supporting Online Material

This supplement contains:
Materials and Methods
Fig. S1
References and Notes
Movie S1

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Movie S1
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Detailed time-space behavior of fish groups in and around the large shoal during daylight hours on 14 May 2003. Frames are updated every 50 s. From 11:31:35 EDT to 12:47:25 EDT, a conventional fish finding sonar (CFFS) track is overlain including the transect illustrated in Fig. 2, A to E. A moving circle, indicating the position of the CFFS measurement, turns black when CFFS fish group density is greater than Vshoal and white when it is less than Vshoal. Co-registration of dense fish groups between the two systems is found to be high. The movie illustrates the continuous evolution of shoal morphology, from consolidation in the morning to fragmentation in the afternoon, also shown by the series of snapshots in Fig. 3, A to E. The shoal often evolves into an hourglass pattern and occasionally splits in two and rejoins before fragmentation. Small isolated fish groups are observed moving throughout the area during the day.

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