Ye and Mohammed; Analysis of variation in catchability of Penaeus semisulcatus in waters off Kuwait 



707 



14 



12 



.2 08 



0.6 



0.4 



0.2 





 5-Sep 



.2 0,8 



0.6 



0.4 



0.2 



5-Sep 



1 994-95 season 



5 -Oct 



4-Nov 



4-Dec 



3-Jan 



3-Feb 



1995-96 season 



5-Oct 



4-Nov 



4-Dec 

 Time 



3-Jan 



3-Feb 



Figure 3 



The fit of the model to the relative stock abundance indices (♦ observed data, - fit) for the 1994-95 and 1995-96 

 seasons. 



the season progressed (Fig. 4). From season opening 

 to closing, catchability decreased from 10.40 x 10~'V 

 boat-day to 4.63 x lO-^/boat-day in 1994-95, and 

 17.05 X 10-*/ boat-day to 7.77 x IQ-^/boat-day in 1995- 



96, respectively (Fig. 4). Comparison between these 

 two seasons shows that shrimp catchability at the 

 beginning of the 1994-95 season was only about 60% 

 of the catchability at the start of the 1995-96 sea- 



