16 



Fishen/ Bulletin 97(1), 1999 



2.5 



2,0 



1.5 



1.0 



1,00 



0.75 



0.50 - 



f ° 25 - 



ra 



O 



— 0.00 



ui 

 o 



-' -0.25 

 -0.50 

 -0.75 



-1.00 



1.5 



1.0 - 



0.5 - 



Pre-recruits 

 Recruits 



Jl 



<56m 56- 110m 111 -185m >185m 



B 



L. pealei 



I. illecebrosus 



I 



¥"» 



1 



I 



T 



T 



<56m 56-110m 111-185m >185m 



Pre-recruits 

 Recruits 



X 



JL 



mi 



X 



h 



U 



m_ 



<56m 56- 110m 111 - 185m 



Depth 



> 185 m 



Figure 3 



(A) Mean catch of L. pealei. iBi mean ratio of prerecruit to recruit 

 catches, and (C) mean catch of/, illecebrosus by depth for positive 

 catches of L. pealei and /. illecebrosus prerecruits and recruits. 



For /. illecebrosus, the mean catch of 

 prerecruits was highest during the day, 

 whereas the mean catch of recruits peaked 

 during dawn and dusk (Fig. 4C), where 

 sample sizes for time zones I, II, and III 

 were 86, 211, and 313 tows, respectively. 

 Mean catches of prerecruits and recruits 

 were lowest at night. For prerecruits, mean 

 catches were not significantly different 

 between time zones I and II (Fig. 4C). In 

 contrast, mean catches of recruits were not 

 significantly different between time zones 

 II and III. Although the mean ratio of 

 prerecruit to recruit catches peaked dur- 

 ing the day ( Fig. 4B ), mean ratios were sig- 

 nificantly different between time zones II 

 and III. Similar to catches of L. pealei, 

 catches of both size categories of /. 

 illecebrosus were lowest at night. 



Mean catches of L. pealei prerecruits and 

 recruits differed by bottom temperature 

 zone (Fig. 5A) where temperature zones I, 

 II, and III were 5.5 to 10.9°C (n=604), 10.9 

 to 16.1°C (n = l,340), and 16.1 to 28.0°C 

 (n=272), respectively. Mean catch of 

 prerecruits increased with bottom tem- 

 perature and peaked in the warmest zone, 

 whereas mean catch of recruits was great- 

 est in zones II and III. In contrast, the 

 mean catches of both size categories were 

 lowest in temperature zone I. Mean 

 catches of prerecruits were significantly 

 different between all bottom temperature 

 zones (Fig. 5A), whereas mean catches of 

 recruits were not significantly different 

 between zones II and III. The mean ratio 

 of prerecruit to recruit catch peaked in 

 zone III (Fig. 5B), and the mean ratios were 

 not significantly different between zones I 

 and II. Overall, catches of L. pealei 

 prerecruits increased with increasing bot- 

 tom temperature, whereas catches of re- 

 cruits peaked at intermediate levels (11- 

 16^Cl. 



Catches of/, illecebrosus prerecruits and 

 recruits also varied (Fig. SO with bottom 

 temperature, where zones I, II, and III 

 were 5.1 to 10.2°C (n = 122), 10.2 to 12.9°C 

 (rt=242), and 12.9 to 25.5^C (n = 121), re- 

 spectively. For /. illecebrosus prerecruits, 

 mean catches were greatest in tempera- 

 ture zones I and II, and the mean catch of 

 recruits peaked in zone II. Mean catches 

 of/, illecebrosus prerecruits and recruits 

 were lowest in temperature zones I and III, 



