Coral Recruitment

[PRJCOLLI at aol.com]

Dear All 

Hi. Im in a bit of a quandry re coral recruitment. Can anyone out there 
please help? 
I need to know how fisheries people acertain cohorts from measurements of 
i.e., length etc... Are cohorts defined by plotting frequencies of all i.e., 
lengths, and then performing a polynomial function to separate ie., 3 
age/size groups?  

Or is it completely different!!!!? 

Many thanks 

Peter Collinson 
University of Hong Kong