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Behav Res Methods. 2014 Sep;46(3):619-24. doi: 10.3758/s13428-013-0399-x.

Subcutaneous dye injection for marking and identification of individual adult zebrafish (Danio rerio) in behavioral studies.

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Department of Psychology, University of Toronto Mississauga, Rm 4023C, 3359 Mississauga Road, Mississauga, Ontario, Canada, L5L 1C6.


The zebrafish is increasingly utilized in behavioral brain research, as it offers a useful compromise between system complexity and practical simplicity. However, a potential drawback of this species in behavioral research is that individuals are difficult to distinguish. Here we describe a simple marking procedure, subcutaneous injection of color dyes, that may alleviate this problem. The procedure allowed us to successfully mark zebrafish and distinguish them for a period of more than 30 days, which is sufficiently long for most behavioral paradigms developed for this species. In addition, we also provide data suggesting that the injection-based marking does not significantly alter social interaction, as defined by the frequency of agonistic behaviors within shoals.

[Indexed for MEDLINE]

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