Which months are you told not to eat shellfish in?

Between myths and truths ... you can hear lots of stories about this ... 

1. Do not eat them in months that have Y in their names ... January, February,July 
2. Eat them in months which have R in their names  ... January (Aha conflict with the above answer), February (Aha, same conflit again) 

I say ... eat them (or do not eat them) irrespective of the month you are in !!