[joedeluco (OP)]

Whenever I see footage of schools of fish they move in such complete unison.  What prompts them to move as a group?  When a predator approaches they all seem to dart in the same direction moving as one.  Do they take their cue from a single fish or do they all respond individually and how is this communicated so instantly to the whole school?

[MOD EDIT - PLEASE PHRASE POST TITLES AS QUESTIONS, WHICH IS FORUM POLICY. THANKS. CHRIS.]

[RD]

http://www.thenakedscientists.com/forum/index.php?topic=25650.0