I have been growing multiple Vibrio species in the lab continuously with no problem. Today after checking plates that are 2 weeks old, I noticed these strange track marks all over the plate. It also exists on the inside of the top to the plate. I grow them on LB plates with more NaCl than usual due to Vibrios salt requirement. I noticed that my unused plates seem to be contaminated with what looks like white specs in the actual agar itself. I have never seen this before, and was wondering if anyone else has? Any idea what it could be contaminated with?

If you notice in the picture there is a small little critter on the inside of the plate.