they stand for how old they are
When you think of a ladybug, you probably have a picture in your mind of a little beetle that is bright red with several black spots on it. That is how most people picture ladybugs and these are the...
There is a museum there, and some of the buildings have been preserved.
Small people have small spots, large people have large spots.
If it has white spots (tubilcles) on it's gill covers (cheeks) and along the front of it's Pectotral fins then it means it's a male fish :-)