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Gómez-Laplaza LM, Gil-Carnicero P. Imprinting in Fish: a Little Explored Phenomenon with Possible Implications for Fish Welfare. ARBS Annu Rev Biomed Sci 2008;10:T51-T62. Imprinting, an early learning process that can determine later preferences for particular types of stimuli, is usually not a consideration in many activities related to fish. However, disruption of such learning and/or absence of suitable conditions for the development of preferences are frequent despite the lack of appropriate knowledge regarding the effects that these practices may have on later behaviour and health. The present study reviews the phenomenon of imprinting in fish and discusses its possible influence on fish welfare. Although there is also potential for acoustic imprinting, here we discuss how sexual, filial and olfactory imprinting should be considered when addressing welfare issues in fish. The review focuses on the relatively few fish species in which this phenomenon has been mainly researched, the results often proving that it may affect some behaviour patterns and social preferences. A diversity of factors, including species, context, behavioural repertoire and social systems may affect the actual existence of the phenomenon, although conditions normally prevailing in husbandry and other systems are not adjusted to allow the emergence of the process. Likewise, the effects of imprinting (or its absence) on fish welfare have still to be demonstrated in many fish species and should constitute a matter for further studies. The conclusion is drawn that much more needs to be learned. However, a better understanding of the relationship between this early learning process in fish and welfare is essential if a complete analysis of conditions promoting fish welfare is to be made.  by São Paulo State University – ISSN 1806-8774

<b>Imprinting in Fish: a Little Explored Phenomenon with Possible Implications for Fish Welfare</b>