The craterfish generally use similar sandy type bottoms that the largemouth bass does. When I fish during the spring, many of the largemouth spawning grounds I used to fish are now littered with craterfish beds. I see many fewer largemouth beds in those locations. I believe the craterfish are very aggressive during the spawn and simply chase the bass away.
So what does the bass do after they get chased away? I believe they try to find a shallow, less populated area, or try to spawn in deeper water. The problem with this are two fold. 1- The shallower, less populated areas usually have a muddy/silted bottom which will not promote a good hatch. 2- The deeper beds will have less sunlight exposure therefore a lower hatch rate.
It wouldn't be so bad if the tilapia would bite like a bass, but they don't. I believe they feed on the microscopic organisms and very small creatures. They just are not a good sports fish!
If we want a good largemouth population in Florida, the state needs to fund some research in how we can control the craterfish population. Here's some of my ideas to control them, 1-Perhaps investigate genetically infiltrating the fish with infertile hybrids, 2- An all year bowfishing season on them, 3- Unlimited netting of them by sports fishermen or commercial.
Whatever the method, if something doesn't happen real soon, we can kiss our bass goodbye! You can get a direct link to this blog at http://www.floridabasslakes.com/
Also check out http://www.floridabassfishing.us
KudoSurf Me!