Abstract
Marine fishes often experience major habitat shifts during their life history, and previous studies have shown that the learning capability of fish change ontogenetically and in accordance with such habitat shifts. However, because all of these studies used a single type of conditioned stimuli (CS), they failed to detect qualitative changes in learning capability. Here we tested the hypothesis that preparedness for learning changes ontogenetically in jack mackerel Trachurus japonicus, which undergo a drastic change in habitat preference during their life history as they move from offshore pelagic waters to coastal and demersal rocky reefs. Groups of juveniles measuring 40 mm standard length (SL) (pelagic stage) and 60 mm SL (demersal stage) were conditioned to food rewards in response to three different CS; the presence of a surface structure, mid-water structure, and aeration. The results showed that small juveniles tended to become conditioned to the surface stimulus faster than they did to the mid-water stimulus. Conversely, large juveniles responded to the mid-water stimulus significantly more quickly than they did to the surface stimulus. These results suggest that stimulus-specific learning capability in T. japonicus changes ontogenetically, facilitating adaptation to their life-history strategy.
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Acknowledgments
We sincerely thank the staff of Notojima Station at the National Center for Stock Enhancement of the Fisheries Research Agency for providing the rotifers used to feed the jack mackerel larvae. We are also grateful to anonymous referees for valuable comments on the manuscript.
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Takahashi, K., Masuda, R., Matsuyama, M. et al. Stimulus-specific development of learning ability during habitat shift in pre to post-recruitment stage jack mackerel. J Ethol 30, 309–316 (2012). https://doi.org/10.1007/s10164-012-0328-y
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DOI: https://doi.org/10.1007/s10164-012-0328-y