Do goldfish really have a 3-second memory?
No. Experiments going back to the 1960s show goldfish learn tasks, keep to schedules and remember far longer than three seconds. The claim has no scientific basis.
Quick Answer
No. The idea that goldfish forget everything after three seconds has no basis in research. In the 1960s, University of Michigan scientists trained goldfish to avoid a mild shock signaled by a light and found the fish locked in a lasting memory of the lesson within about an hour. At the University of Plymouth in England, psychologist Phil Gee trained goldfish to push a lever for food, then set the lever to work for just one hour a day; the fish learned to press it at the right time. In a separate study in Israel, fish trained to come to a feeding sound still responded five months later. A 2015 review in the journal Animal Cognition concluded that fish perception and thinking skills often match or exceed those of other vertebrates.
By the Numbers
Key Facts
- Short answer
- No. The three-second memory is a myth
- 1960s lab work
- Goldfish locked in a lasting memory of a lesson within about an hour
- Telling time
- Goldfish learned to press a food lever during the one hour a day it worked
- Fish in general
- Their thinking skills often match other vertebrates, a 2015 review found
What the experiments show
In a series of 1960s experiments at the University of Michigan, goldfish learned to avoid a mild shock that followed a light. The researchers found the fish formed a lasting memory of the lesson in about an hour. Later, at the University of Plymouth, goldfish learned not just to press a lever for food but to press it during the one hour a day it worked.
Fish are smarter than their reputation
A 2015 review of fish research in the journal Animal Cognition concluded that fish perception and cognitive abilities often match or exceed those of other vertebrates. Fish learn routines, remember places and respond to cues long after training.
Myth vs. Fact
MythGoldfish have a three-second memory.
FactExperiments show goldfish remember lessons far longer, and fish in other studies remembered for months.
MythFish can’t really learn.
FactGoldfish have learned to press levers, avoid danger and keep to a daily schedule.
The Bottom Line
Goldfish don’t have three-second memories. Experiments show they learn, keep to schedules and remember lessons far longer, so it’s the myth that deserves to be forgotten.