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Fishery Bulletin 95( 1 ), 1997 
(<12°C) is shallower (20 vs. 50 m on the east coast) 
from spring to autumn, and the temperatures above 
20 m are generally 13-19°C during this period 
(Atkins, 1970; Boyd et ah, 1985; Largier et al., 1992; 
Greenwood and Taunton-Clark 2 ). Because inshore 
temperatures are lower than those on the east coast, 
silver kob are caught by linefishermen from the surf 
zone to depths of 20 m. As along the east coast, the 
bottom mixed layer deepens to about 100 m in win- 
ter (Atkins, 1970; Boyd et ah, 1985; Largier et al., 
1992), and silver kob are expected to move offshore 
(as indicated by catch trends [Fig. 5]). Because the 
depth contours broaden east of Cape Hangklip, it is 
possible that there is also an easterly component to 
the offshore dispersal of silver kob. A seaward and 
eastward winter migration has also been postulated 
