Brodziak and Hendrickson: Environmental effects on survey catcties of Lollgo pealei and ///ex illecebrosus 



17 



respectively. For prerecruits, mean catches 

 were significantly different only between 

 temperature zones I and II (Fig. 5C), 

 whereas mean catches of recruits were sig- 

 nificantly different only between zones II 

 and III. The mean ratio of prerecruit to 

 recruit catches was greatest in tempera- 

 ture zones II and III (Fig. 5D), however 

 there was no significant difference be- 

 tween the three zones. Overall, catches of 

 /. illecebrosus prerecruits and recruits 

 were relatively similar over the range of 

 observed bottom temperatures (5-25°C). 



Mean catches of L. pealei prerecruits 

 and recruits differed with surface tem- 

 perature (Fig. 6A) where temperature 

 zones I, II, and III were 7.1 to 14.8°C 

 (n=615), 14.8 to 20.9°C (n=l,178), and 20.9 

 to 28.3°C (n=460), respectively Mean 

 catches of prerecruits and recruits peaked 

 in temperature zone II, whereas the low- 

 est mean catch of prerecruits and recruits 

 occurred in temperature zone I. Mean 

 catches of both prerecruits and recruits 

 were significantly different across all sur- 

 face temperature zones (Fig. 6A). The 

 mean ratio of prerecruit to recruit catches 

 peaked in temperature zone II and the 

 mean ratios were significantly different 

 across all surface temperature zones (Fig. 

 6B). Overall, catches ofL. pealei prerecruits 

 and recruits peaked at intermediate sur- 

 face temperatures (15-21°C). 



Mean catches of/, illecebrosus prerecruits 

 and recruits (Fig. 6C) also varied with sur- 

 face temperature, where temperature 

 zones I, II, and III were 7.8 to 14.4°C 

 (/! = 123), 14.4 to 20.6°C («=242), and 20.6 

 to 26.5°C (n = 131), respectively. For /. 

 illecebrosus prerecruits, mean catch 

 peaked in temperature zone II but exhib- 

 ited no trend across zones. In contrast, 

 mean catch of recruits peaked in tempera- 

 ture zone III and exhibited an increasing 

 trend with surface temperature. There 

 were no significant differences in mean 

 catch of prerecruits, by surface tempera- 

 ture zone (Fig. 6C), but mean catches of 

 recruits were significantly different be- 

 tween temperature zones I and III. The 

 mean ratio of prerecruit to recruit catch 

 peaked in temperature zone I (Fig. 6D) and 

 declined with increasing surface tempera- 

 ture. These mean ratios were significantly 

 different between zones I and III. Over- 



2.5 



2.0 



0.0 



Pre-recruits 

 Recruits 



DAWN or DUSK DAY 



NIGHT 



1,5 ■^ 



1.0 



0.5 - 



DAWN or DUSK DAY 



NIGHT 



DAWN or DUSK DAY 



Time of day 



NIGHT 



Figure 4 



(Al Mean catch of L, pealei, (B) mean ratio of prerecruit to recruit 

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

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



