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Phototaxis and Geotaxis of Light-Adapted Zoeae of the Golden King Crab Lithodes aequispinus (Anomura: Lithodidae) in the Laboratory

C. F. Adams and A. J. Paul
Journal of Crustacean Biology
Vol. 19, No. 1 (Feb., 1999), pp. 106-110
Published by: on behalf of The Crustacean Society
DOI: 10.2307/1549552
Stable URL: http://www.jstor.org/stable/1549552
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Phototaxis and Geotaxis of Light-Adapted Zoeae of the Golden King Crab Lithodes aequispinus (Anomura: Lithodidae) in the Laboratory
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Abstract

Phototaxis and geotaxis of light-adapted zoeae of the golden king crab Lithodes aequispinus Benedict were investigated in the laboratory. Stages I, II, and III zoeae were positively phototactic to white-light intensities of 1.5 × 1015 q s-1 cm-2 and 3.1 × 1013 q s-1 cm-2. No significant response was observed in zoeae of any stage to 7.3 × 1011 q s-1 cm-2. Negative geotaxis was observed in all three stages, although this response was significantly diminished in stages II and III. These behaviors are similar to those seen in stage I larvae of the red king crab Paralithodes camtschaticus, as well as in later zoeal stages of several brachyuran crabs.

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