A guppy finds food faster by watching its tankmates, field study shows
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
A fish alone in a bare tank has to learn everything by itself; a fish in a group can benefit from what its tankmates have already found out. That is what Reader, Kendal and Laland documented in a 2003 study published in Animal Behaviour, carried out directly in the river on wild Trinidadian guppies (see the study, doi 10.1006/anbe.2003.2252). More enrichment ideas are gathered in the fish toys and enrichment section.
Contents · 5 sections
An experiment run in the guppies' own habitat
The researchers set up two distinct, easily recognisable feeders in rivers where the observed guppies already lived. During a training phase, one of the feeders was paired with a shoal of conspecifics held in a transparent, visible-but-unreachable container. Once training ended and the container was removed, the fish were then tested alone, facing two feeders identical in appearance.
The result: a choice that owes nothing to chance
Guppies entered the feeder that had been paired with the conspecific shoal significantly more often than the other one. No food smell or direct cue could explain the preference, since both feeders were treated identically apart from the shoal's presence during training: the only explanation the authors retained is that the fish had learned the location by watching their conspecifics gather there, without having fed there themselves.
What this means for an aquarium tank
This study concerns learning a location in an open natural setting, not a puzzle feeder in a closed tank — it says nothing about how fast an isolated fish would learn the same location alone, nor about species other than the guppy. It does highlight something often overlooked: a newly introduced fish, rather than being kept isolated during observation, may learn where to feed faster simply by sharing the tank with already-established tankmates. That is one more argument, independent of the already-known social welfare benefits, for keeping shoaling species in groups — see our guide on enrichment levels in guppies.
What the study does not show
It does not measure long-term retention of the transmitted information, nor any effect on growth or reproduction. Nor does it compare social learning with individual learning under controlled tank conditions — the comparison was made in the river, with everything that entails. The documented mechanism is a behavioural fact, not a stocking-density recommendation.
Frequently asked questions
Should a new guppy be kept with tankmates so it learns faster?
The study suggests an advantage to conspecific presence for locating a feeding spot, but a health quarantine period still takes priority over this behavioural consideration — see our quarantine protocol before introduction.
Does this kind of social learning exist in other aquarium fish?
The study covers only wild river guppies; whether the same mechanism exists in other shoaling species is not shown here. Find all our guides on the fishkeeping hub.
In our shop, for this use: Programmable automatic aquarium fish feeder (€32.90) · the whole shop
This guide is part of Planète Pets’s Fishkeeping universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.