I was reading a bit on this and this statement was disturbing:
"Game fish Prey - While gobies are preyed upon by several sport fish species (e.g., smallmouth and rock bass, walleyes, yellow perch, and brown trout), there may be a perception that gobies are beneficial for fishing. However, because their diet consists predominately of zebra mussels, there may be a direct transfer of contaminants from gobies to sport fish, which could ultimately harm humans who consume their catch."