18 



Fishery Bulletin 97(1), 1999 



2.5 





0.0 



1.5 



1.0 



0.5 



0.0 



Pre-recruits 

 Recruits 



5.5- 10.9 



10.9- 16.1 



:10.9 



10.9-16.1 



>16.1 



Pre-recruits 

 Recruits 



T 



ji. 



1 



LiL 



JL, 



5.1-10.2 10.2-12.9 12.9-25.5 



Bottom temperature (C) 



Figure 5 



(A) Mean catch of Z.. pealei. IB) mean ratio of L. pealei prerecruit to 

 recruit catches, iC) mean catch of/, illecehrosus. and (D) mean ratio of 

 /. illecebrosus prerecruit to recruit catches by bottom temperature for 

 positive catches of prerecruits and recruits. 



all, catches of /. illecebrosus prerecruits 

 were similar across the range of observed 

 surface temperatures (8-26°C), whereas 

 catches of recruits increased with surface 

 temperature. 



Diel correction factors 



Diel effects from the GLM analyses were 

 significant for L. pealei prerecruits and 

 recruits and for /. illecebrosus prerecruits 

 (Table 3). For L. pealei prerecruits, the 

 time period effect was highly significant 

 (F^.=280.79, P<0.001), and the year 

 (F^,=6.05, P<0.001) and stratum effects 

 (Fg=\&.23, P<0.001) were also significant. 

 Estimates of the diel effects coefficients for 

 L. pealei prerecruits were T[ = 0.0873 with 

 95% CI of [0.0713, 0.1068 ] and T„ = 0.4654 

 with 95%CI of [0.3958, 0.5472 ]. For com- 

 parison, daytime catch rates of L. pealei 

 prerecruits were roughly were about 11.5 

 times higher than time zone I values and 

 2.1 times higher than time zone II values. 

 Similarly, for L. pealei recruits, the time 

 period effect was highly significant 

 (^5=100. 06, P<0.001), and the year 

 (F,,=9.84, P<0.001 ) and stratum (^5^:12.45, 

 P<0.001 ) effects were also significant. Esti- 

 mates of the diel effects coefficients for L. 

 pealei recruits were T, - 0.3420 with 95% 

 CI of [0.2939, 0.3979 ] and Tj, = 0.8325 

 with 95%CI of [0.7372,0.9402 J.Time zone 

 III catch rates of L. pealei recruits were 

 roughly 2.9 times higher than time zone I 

 values and about 1.2 times higher than zone 

 II values. For/, illecebrosus prerecruits, the 

 time period effect was significant (F^.=20.23, 

 P<0.001 ). The stratum effect was also sig- 

 nificant (Fg^l.98, P<0.001) but the year 

 effect was not (^^=1.48, P=0.057). Diel ef- 

 fects coefficients were estimated to be T, 

 = 0.4251 with 95% CI of [0.3158, 0.5724 ] 

 and T,i = 0.6281 with 95%CI of [0.5093, 

 0.7746 ]. By comparison, time zone III 

 catch rates of /. illecebrosus prerecruits 

 were about 2.4 times higher than zone I 

 values and roughly 1.6 times higher than 

 time zone II values. For /. illecebrosus re- 

 cruits, the time period effect was not sig- 

 nificant (Fg:^2.25, P=0.106), although the 

 year (F^.=5.41, P<0.001) and stratum 

 (P^.=3.05, P<0.001) effects were significant. 

 For both species, diel effects were more pro- 

 nounced for prerecruits than for recruits. 



