[OANNES Foro] Ontogenetic changes in the spatial learning capability of jack mackerel Trachurus japonicus

[Mario Cabrejos]

Journal of Fish Biology
Volume 77, Issue 10, pages 2315-2325, December 2010
Article first published online: 3 NOV 2010
DOI: 10.1111/j.1095-8649.2010.02812.x

Ontogenetic changes in the spatial learning capability of jack mackerel Trachurus japonicus
K. Takahashi, R. Masuda, Y. Yamashita
Maizuru Fisheries Research Station, Kyoto University, Nagahama, Maizuru, Kyoto 625-0086, Japan
*Correspondence: K. Takahashi,  Tel.: +81 773 62 5512; email: tkouji en kais.kyoto-u.ac.jp
Abstract
Ontogenetic changes in learning capability were studied in jack mackerel Trachurus japonicus juveniles ranging from 20 to 95 mm standard length (LS) collected from either pelagic or coastal habitats. Simple spatial and reversal learning tasks were used to estimate learning capability. There was no size dependence in the scores of simple reward conditioning using a Y-maze, whereas the scores of reversal learning tasks showed a clear sigmoidal curve of increase with an inflexion point at 51·7 mm LS. The increase in this learning capability coincided with the size at which juveniles recruit from offshore pelagic to coastal rocky habitats.
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