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Angelfish (Pterophylum scalare) will learn and remember who feeds them. They can even be trained to come to their names and have been known to recognise (hide from) people who have frightened them. They can learn to do many other things too. So I guess the memory 'span' of an Angel fish is probably as good as and spans a time as good as its' lifetime which can be around 10 to 15 years. (I have heard of Angels living for 20 years)

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9y ago

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