150 



Fishery Bulletin 94|l), 1996 



tiger prawns in Kuwait waters because this species 

 is short lived and has only one main recruitment (van 

 Zalinge, 1984) so that different cohorts can be recog- 

 nized clearly and the central location of the length 

 distribution for each cohort can be defined easily. This 



method may be used for other short lived species with 

 discontinuous recruitment. 



The sensitivity of the growth estimates to the sub- 

 jective selections of the spread width of the central 

 location was investigated with the length-frequency 



