Here is a link where FWC has been sampling south florida waterways for exotics. It gives the name and general area of the canals and lakes.Louie;3046674; said:They are still caught now at Lake Ida . Think the park is at Delray beach .My father in law goes there during winter but uses boat. PB there in same lake. Snakeheads also but think those are more in the canals that feed the lake.
I have never been there myself as few hours away .
http://myfwc.com/docs/WildlifeHabitats/Nonnative_FW_ExoticFishStatus2007FloridaScientist.pdf
Knifefish is on page 7 - 8 of this PDF. Really interesting read.