Abstract
Phototaxis and gcotaxis 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 x 1015 q s ' cm 2 and 3.1 x 10" q s ' cm 2. No significant response was observed in zoeae of any stage to 7.3 x 10" 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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