Abstract
Escape rates and behaviors of the invasive crabs Charybdis japonica and Portunus pelagicus were investigated in two commercial pots: a box-shaped pot with two slit entrances at the ends and a dome-shaped pot with two open funnels. A variation of the dome-shaped type with two plastic triggers installed in each entrance that served as non-return devices was also tested. Pots, each with one marked crab inside, were set in a pond that is connected to Kagoshima Bay, Japan. Escape rates over a 7-day period were observed while diving. Furthermore, escape behaviors of C. japonica were examined in a tank for both types of pots containing a single crab in each. Escape rates of crabs were highest in the dome-shaped pots because of the open funnel entrances, followed by those in pots with triggers installed, but there was no escape in the box-shaped pots because the tight slit entrances prevented the crabs from getting out.
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