+1 calaveras. Its infested
Infested is the word. They need to drain that lake, nuke it with rotenone, and start over.
that usually doesn't work.
Bass lake in central Ca. became infested with Northern pike in the late '80's. in '93 Ca. DFG
nuked the whole lake with rotenone, then drained it for 6 months, & re-filled it.
8 months later, lake is full of frogs & northern pike......