cobalt blue crawfish vs blue knight lobster

[Megalofyia]

How do you tell the difference between a cobalt blue crawfish and blue knight lobster with out waiting to see if it gets to be more than 6 inches?

 

[Megalofyia]

bump

 

[William]

DNA analysis?

altho that'd be expensive.

 

[Megalofyia]

hmm is there a cheaper way. I was pictures of both on a website and they looked identical to me.. except one reaches a foot in length and the other only 5 inches..

 

[rabbit]

Dunno if youve checked it out here. They've some info on various types.
http://www.shrimpcrabsandcrayfish.co.uk

 

[rabbit]

mind you, dont know if its the info you need. Havent actually read through it all. lol

(although they do have articles for various "blue" crayfish/lobsters)

 

[madasafish]

Urg. It gets even more complicated, too. There are lots of blue lobster/crayfish species out there. Procambarus clarkii (from NA) is the one I'm getting this coming Monday, and that grows to 5 inches. But I don't know much more about differentiation...