ok guys the black spots on bluegill or other panfish are called black grubs they come from underwater snails & attached themselves under the fins of the fish but it isnt harmful if you eat them so dont worry if you eat them it wont hurt ya cuz i have ate some & i didnt feel sick or anything cuz when you cook them it keels the worm anyways witch is protein & the worm that you see in the flesh of the fish is a yellow grub & they also can be seen on the outside of the body also due to hot weather.