Abstract
Summary Mosquitofish, Gambusia affinis, from shallow water along straight shorelines moved on a compass course perpendicular to the home shore (Y-axis) when released in test arenas under sunny skies or an artificial 'sun'. Fish tested at various times of day indoors exhibited a time-compensated directional response. Orientation failed under completely overcast skies, in diffuse light, and after fish were kept in darkness for 72 hr. Smaller fish, larger test arenas, and outdoor tests favoured accuracy of orientation. Shoreward orientation was absent in mosquitofish from environments lacking predacious fish that normally prey upon mosquitofish. Acknowledgments This study was supported in part by National Science Foundation Grants GB 3991 and GB 7063 to D. E. Ferguson. The senior author held a National Defense Education Act Graduate Fellowship while working on the project. REFERENCES Ferguson, D. E. & Landreth, H. F. (1966).
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