Old Tail Disease?

[comocrayfish5]

i know he isnt a fish but i have decided to put this post here
 
 
i was looking in Kabobs tank and i noticed that he has these weird spots on is tail, moldy bread comes to mind. i dont know what they are or if crayfish get them when they older, he is probably about 4 years old. i tried to pick him up to get a better pic, but now that he has molted he is not has gentile and will get aggressive when i touch him and will open his claws and swim away. and i gave up because i dont want to mess with a 1/2 foot cray with claws as big as my pinkie finger

 
any idea of what it is?? there is some on his legs too i think.
 
the ugly gray/brown dots:

 
 
 

 

 

[thereverendturtle]

I've seen spots like that on crays and other decapods. Sometimes they are just variations when they molt. Usually on the next molt they will either go away or increase. Either way, unless they are raised or fuzzy, I wouldn't worry.

 

[comocrayfish5]

ok thanks!!