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Swimming behavior was observed and substrate preference determined for glaucothoe stage postlarvae of the red klng crab Paralithodes camtschaticus In the laboratory. One hundred 1 d old glaucothoe were placed into each of 3 replicate 10 1 aquana, each containing a choice of 3 substrates: sand, gravel, or synthetic fiber mesh. Glaucothoe began settling on the first day, and <10% remained swimming after Day 6. Glaucothoe showed a significant preference for the structurally con~plex mesh substrate. Occupancy of mesh increased from 49% on Day 2 to 75% by metamorphosis to the first crab (Cl) instar, with a mean of 62 * 11 %. Glaucothoe rejected sand, and only 1 % were observed on it. Settlement was also tested in aquaria with only sand, gravel or mesh substrates. Glaucothoe in gravelor ~ ~ e s h o n l y aq~iai-ia s~lttled rapldly. whereas 40% of glaucothoe in the sand-onlv aquarium continued swimming until metamorphosis to C1 instar In addition, mean time-to-metamorphos~s in the sand-only aquarium (17.6 d) was significantly greater than in other experimental aquarla (16 8 d) . Glaucothoe in the sand-only aquarium exhibited marked diurnal swimming behavior; 66 % were swimming at 14:OO h (vs a maximum of 12 % in other aquaria), but only 5 % (vs l %) were swimming at 02:OO h. Daytime swimming probably allows glaucothoe to avoid nocturnal predators while searching for preferred substrates, i.e. those which are structurally complex, can be easily grasped, and provide a high degree of interstitial space.

Postlarval settling behavior, substrate preference, and time to metamorphosis for red king crab Paralithodes camtschaticus