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AnimalLearning&Behavior1977,5(2).213-216Effectofgroupsizeonavoidancelearninginzebrafish,Brachydaniorerio(Pisces:Cyprinidae)PHYLLISE.GLEASONandPETERG.WEBERDepartment01Biology,StateUniversityCollegeatOswego,Oswego,NewYork13/26andSUZANNEP.WEBERDepartment01Biology,SyracuseUniversity,Syracuse,NewYork13210Thepurposeofthisstudywastoinvestigatetheeffectofdensityoffishontherateofavoidancelearninginaschoolingfish.Naiveadultzebrafish(Brachydaniorerio)weretrainedinatwo-wayaquaticshuttlebox,inIsolation,ingroupsoftwo,oringroupsoffive.Thenumberoftrialstoreachprogressivelymoreexactinglevelsofperformance(I,2,3,...,9consecutivecorrectavoidanceresponseson2successivedays),wasusedtoquantifytherateoflearningforindividualsinthethreegroups.Usingthismeasure,individualsingroupsoffivereachedanygivenlevelofperformanceinfewertrialsthanindividualstestedalone,whichinturnreachedtheprogressivecriteriainfewertrialsthanindividualstestedinpairs.Inaddition,themeanlatencyofresponsetotheconditionedstimulusforindividualsingr...