500 



Fishery Bulletin 90(3). 1992 



able biomass oiH. laevigatus than does Niihau. In ag- 

 gregate, we estimate the exploitable stock at all islands 

 to be Bitot = 271.4 MT (p[217.3<Bii„t<325.5] =0.95, 

 SE 27.6MT, CV 10.18%). 



Analysis of length-frequency data 



Although the Kaulakahi Channel study site was sampled 

 on seven different occasions over a 29-month period 



(May 1986-October 1988), during which over 6800 

 female and 1 1 ,800 male shrimp were sexed and mea- 

 sured, there was little evidence of progression in size 

 modes (Fig. 7). The CL frequency distributions of male 

 shrimp were particularly stagjiant, and those of fe- 

 males showed no coherent pattern that could be attrib- 

 uted to the influx of year-classes into the exploitable 

 population. 

 Due to the apparent stationary behavior of these 



