Newly constructed biotopes have been become common for the purpose of nature restoration and ecological education in Japan. One of the problems on biotope management is how to control invasion of alien species. In biotope pools, invasive American crayfish, Procambarus clarkii, gives many impacts to native ecosystems, such as feeding damage on aquatic plants, predation on fi sh and macroinvertebrates, and water leakage through burrowing. More effective collecting method for removing the crayfish is expected by biotope managers. In this study, convenient and inexpensive method for removing the invasive crayfish was tried in an irrigation pond in Sanda City, Hyogo Prefecture. To compare effectiveness in collecting crayfi sh among different food items, cage traps with various foods were submerged in the pond for a week. The crayfi sh and other animals collected in the traps were counted. Crab stick and fi sh sausage attracted the most number of crayfi sh, turtles and frogs. We also recommend the dumpling of roasted rice bran as the most effi cient item in terms of price and attractiveness.
