초록

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Abstract ▼ AI-Helper

The behavior of crab, Charybdis japonica h. Milne EDWARDS, to the net pots with baits was investigated alternately in the experimental tanks. One of the pots being dropped on the tank bottom, the crabs touched it to obtain the bait probably reacted by their senses of smell and sight, and increased g...

The behavior of crab, Charybdis japonica h. Milne EDWARDS, to the net pots with baits was investigated alternately in the experimental tanks. One of the pots being dropped on the tank bottom, the crabs touched it to obtain the bait probably reacted by their senses of smell and sight, and increased gradually in the number of touch to show a maximum within 30 min. The crabs, if touched circular pots, were guided more easily to the pot entrances than the case of touching square ones, but the guidance from the vicinity of the entrances into the pots was easier in the square. When the crabs entered the pots, they always showed a sharp precaution. However, most of enterings were made mainly within 30 minutes and easier in pots with lower entrances. If 30 min. elapsed, the entering was little made by the decrease in the number of touch and the getting-out was remarkable, especially in pots with low entrances. But, in all the pots the getting-out was hampered by the drawing of the entrance tips into the pots. In case in which flappers were attached to the entrance tips, the entering was very hampered, hut the getting-out was not shown.