Officials from the state Department of Energy and Environmental Protection (DEEP) and other supporting agencies watch a demonstration of the water flow after a dedication of the new Hallville Fishway on Thursday in Preston. The fishway will allow alewife and other fish to travel upstream in the Poquetanuck Brook to Hallville Pond and other habitats to spawn. The $500,000 project was funded by the U.S. Fish and Wildlife Service, DEEP and grants from the Fishers Island Ferry Association and other groups. After a program where all parties were thanked, Scott Gravatt, executive director of the Eastern Connecticut Conservation District, demonstrated the slower flow of the water traveling through the fishway by sending 75 yellow rubber ducks down (opposite the way fish would travel) the chutes. Guests were also shown the video system that will allow scientists, and anyone curious, to view fish swimming by an observation window in the fishway.