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Despite their grumpy appearance, and menacing mouth gaping, Moray's aren't naturally aggressive towards humans. The mouth gaping is pushing water over their gills to breath. Aggressive behaviour usually comes from them being fed, which changes their behaviour. They then associate humans with food and start expecting to be fed. Fish feeding is a seemingly innocent, but very damaging practice, that not only affects the fish directly, but alters the balance of the food chain too.