It's easy to catch small fish for your research with this effective,low cost device. Just set one in the water in your pond or lake and return at your convenience.

125-G20 Gee Eel Trap
This trap is constructed of 1/4" (6.4 mm) square wire mesh that is galvanized for durability. It is 16" (42 cm) long and 9" (23 cm) wide with a 7/8" (22 mm) entrance hole.

This trap is the same as the minnow trap pictured above, but with a 15" extension in the middle.