6-11-12  --  Boaters in Minnesota are not catching on to aquatic invasive species regulations as quickly as state enforcement officials had hoped.  The D-N-R's Phil Meier told a lake association in Detroit Lakes that officers have checked about eight-thousand boats since the fishing opener in May -- and Meier says the sad thing is that so far they've issued 193 criminal citations, 463 civil citations and 975 written warnings.  He says regulations have been well publicized across the state and they were hoping for a decrease in violations.  This year's preliminary aquatic invasive species violation rate is just over 20-percent - up from 18 percent in 2011.