Phototaxis and geotaxis of light-adapted zoeae of the golden king crab Lithodes aequispinus (Anomura: Lithodidae) in the laboratory
Adams, CF.; Paul, AJ.
Journal of Crustacean Biology 19(1): 106-110
ISSN/ISBN: 0278-0372 DOI: 10.1163/193724099x00303
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 X 1015 q s-1 cm-2 and 3.1 X 1013 q s-1 cm-2. No significant response was observed in zoeae of any stage to 7.3 X 1011 q s-1 cm2. 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.