The full moon period each month from May-Oct (+/-) is primarily the time that crabs shed. I am sure they shed all month but during the full moon cycle is when I have noticed when shedding is most predominant.
When my time permits, the full moon period is when I target the grass beds in shallow water during low tide. Soft crabbing is a lot of fun. Wading through the seaweed beds with a softcrab net and scooping them up is only something you can appreciate opnce having experienced it.
One year while on strike from the phone company back in the 80's I caught dozens of softies in Crab Alley Creek wading with a net over a 2 day period.
I mean like 5 doz, easy.
I dont know if this answers your question, but it is MHO based on my fond memories. Of which, I hope to gain more.