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the claim

Fish have no memory

the verdict
REFUTED
the evidence says no
Recorded sources
0 sources for · 5 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that fish have no memory?

No. Extensive scientific research refutes the myth that fish have no memory, demonstrating that fish possess robust spatial learning, navigation, and long-term memory capabilities.

Verdict: REFUTED · 0 sources for, 5 against · Last checked

The analysis

The claim that fish have no memory is directly contradicted by multiple studies showing advanced spatial cognition, memory retention over weeks, and the underlying neural structures supporting these capacities in teleost fish.

Evidence against · 5
Spatial cognition and its neural basis in teleost fishes
2003
This review demonstrates that the spatial behavior of fishes relies on learning and memory mechanisms supported by specific brain circuits comparable to land vertebrates.
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Broglio, C., Rodríguez, F., & Salas, C. (2003). Spatial cognition and its neural basis in teleost fishes. doi.org. https://doi.org/10.1046/j.1467-2979.2003.00128.x

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More against · 4
Spatial memory, landmark use and orientation in fish
1998
The study highlights that spatial orientation and memory are fundamental capabilities for fish across various aquatic habitats.
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Braithwaite, V. A. (1998). Spatial memory, landmark use and orientation in fish. doi.org. https://doi.org/10.1093/oso/9780198500070.003.0005

The neural substrate of navigation using hydrostatic cues in goldfish.
2025
Research on goldfish indicates that specific pallium regions are critical for spatial navigation, confirming the presence of complex memory and processing systems.
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S, G., R, A., & R, S. (2025). The neural substrate of navigation using hydrostatic cues in goldfish.. doi.org. https://doi.org/10.1098/rsos.241869

The Impacts of Pregnancy on Cognition and Cell Proliferation in a Live-Bearing Fish (Poeciliopsis gracilis).
2026
Investigations into live-bearing fish reveal that they possess spatial memory capabilities, which can even be impacted by physiological states like pregnancy.
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TR, E., A, K., S, V., A, L., JL, v. L., A, K., A, K., & BJA, P. (2026). The Impacts of Pregnancy on Cognition and Cell Proliferation in a Live-Bearing Fish (Poeciliopsis gracilis).. doi.org. https://doi.org/10.1111/ejn.70523

Stress in the spotlight: impacts of stress on learning and memory in a cichlid fish.
2025
Experiments with cichlid fish show that individuals can retain learned foraging tasks in memory for up to 48 days.
Get citation
C, C., E, L., & S, B. (2025). Stress in the spotlight: impacts of stress on learning and memory in a cichlid fish.. doi.org. https://doi.org/10.1007/s10071-025-02030-4

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What does the evidence say?

The claim that fish have no memory is directly contradicted by multiple studies showing advanced spatial cognition, memory retention over weeks, and the underlying neural structures supporting these capacities in teleost fish.

Receipt History
first checked04 Aug 2026
judged → REFUTED · 1404 Aug 2026
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