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Relationship between individual and group learning in a marine teleost: A case study with sea bass under self-feeding conditions

Learn Behav, 45 (1), pp. 276-286.

Benhaim, D., Ferrari, D., Colchen, T., Chatain, B., Begout, M.-L.

2017

Fish learning and cognition are usually approachedby testing single individuals in various devices such as mazesthat have serious drawbacks, especially in gregarious species,including the stress induced by the test procedure. This mightimpair the results and lead to misinterpretation about the learn-ing abilities of the targeted species. In order to provide an alter-native to the individual-based tests, we investigated for the firsttime the operant conditioning of four similar groups (50 indi-viduals per tank) of sea bass. We used two computerized self-feeder devices per tank, each coupled with individual electronicidentification and that were alternately activated during varyingpositive appetitive reinforcement period of time (7 to 1 day).Learning abilities were examined at both group and individuallevels. At the group level, the operant conditioning was dem-onstrated as the triggering activity significantly decreased whenthe device was turned off and increased when it was turned on,whatever the reinforcement period duration. The individuallevel analysis revealed a more complex situation with fishshowing different learning performances that can be best ex-plained through the producer-scrounger game theory.

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