Why do fish move in shoals?

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Offline joedeluco

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Why do fish move in shoals?
« on: 08/06/2010 12:12:57 »
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.]
« Last Edit: 05/09/2010 16:34:49 by chris »

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Offline RD

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