Why do fish swim in schools?
Show answer & explanation
Answer: Protection from predators
Staying warm together — Wrong. Schooling doesn't provide warmth. It's antipredator strategy—many eyes detect threats, coordinated movement confuses attackers.
Protection from predators ✓ — Correct! Collective defense! Fish school for safety: (1) Dilution effect—individual predation risk decreases in group. (2) Confusion effect—predator overwhelmed by synchronized movement. (3) Many eyes—earlier predator detection. (4) Hydrodynamic efficiency—reduced drag. School coordination: lateral line system detects water movement (neighbor positions). Split-second synchronization—looks choreographed! Some schools millions strong. Also helps find food, mates. Trade-off: attracts larger predators!
Increasing swimming speed — Wrong. Schools don't swim faster than individual fish—speed depends on species and body shape. Schooling's main benefit is predator protection through confusion and dilution effects.
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