Do fish have the memory of a goldfish?

‘You really have the memory of a goldfish!’ This unflattering expression, used to mock someone's poor memory, is based on a common misconception that is completely false!  

Contrary to popular belief, fish are perfectly capable of memorising behaviours or locations, and one study showed that the goldfish Carassius auratus can retain memories for up to five months.  

Fortunately, because their survival depends on it. A fish that strays from its habitat must be able to find its way back, identify its predators and recognise its sexual partners.

Researchers have observed that clownfish larvae, once they reach adulthood, return to the place where they were born. Another study has shown that surgeonfish can remember the smell of a predator for several days and flee as soon as they sense its presence.  

At Nausicaá, the animal handlers set up training sessions to facilitate the distribution of food or medical care. This work is based on the regularity and repetition of gestures. These enrichments contribute to animal welfare while facilitating the work of the carers.

Moray eels, manta rays and eagle rays have all learnt behaviours and retained routines that enrich their interactions with the carers.

So the next time someone makes fun of your goldfish memory, just smile back and say "Thank you!