BOEHLERT ET AL.: VERTICAL DISTRIBUTION OF ICHTHYOPLANKTON 



Table 5.— Mean abundances (number per 1,000 m^) for offshore larval species from spring (day only) 



samples. 



Depth (m) 



Species 



0-5 5-10 10-20 20-30 30-40 40-50 >50 



Mean 



Offshore 

 Engraulidae 



Engraulis mordax 

 Bathylagidae 



Bathylagus ochotensis 



Bathylagus pacificus 

 Myctophidae 



Protomyctophum crockeri 



Protomyctophum thompsoni 



Stenobrachius leucopsarus 

 Bythitldae 



Brosmophycis marginata 

 Scorpaenidae 



Sebastes spp. 

 Bothidae 



Citharichthys sordidus 

 Pleuronectidae 



Glyptocephalus zachirus 



Lyopsetta exilis 

 Coastal-Offshore 

 Pleuronectidae 



Hippoglossoides elassodon 



— — 0.56 — 0.78 7.28 0.87 1.36 



— — — — — — 0.22 0.03 



— — — — — 0.75 — 0.11 



— — — — — 1.74 1.19 0.42 

 0.49 6.79 2.76 0.47 — — — 1.50 



— 2.73 1.06 1.49 — — — 0.75 



— — 1.06 — — — 



— — — — 11.27 14.9 



1.49 — — 



8.56 



0.15 

 4.96 



0.21 



Table 6.— Mean abundances (number per 1,000 m^) for offshore larval species from summer day 



samples. 



Depth (m) 



Species 



0-5 5-10 10-20 20-30 30-40 40-50 >50 Mean 



Offshore 

 Engraulidae 



Engraulis mordax 

 Bathylagidae 



Bathylagus ochotensis 



Bathylagus pacificus 

 Myctophidae 



Protomyctophum crockeri 



Protomyctophum thompsoni 



Stenobrachius leucopsarus 

 Bythitidae 



Brosmophycis marginata 

 Scorpaenidae 



Sebastes spp. 

 Bothidae 



Citharichthys sordidus 

 Pleuronectidae 



Glyptocephalus zachirus 



Lyopsetta exilis 

 Coastal-Offshore 

 Pleuronectidae 



Hippoglossoides elassodon 



0.98 2.13 — — — — — 0.44 



1.49 0.73 _____ 0.32 



— 0.65 3.03 1.08 1.10 — — 0.84 



— 0.73 _____ 0.10 



— 2.11 19.55 4.52 _ _ _ 3.74 



— — 10.03 11.53 4.38 2.13 — 4.01 



1.10 — 



0.16 



Only Sebastes and Lyopsetta exilis larvae were abun- 

 dant in all three sampling periods. Sebastes larvae 

 were most abundant in nighttime samples, when 

 they were mainly collected in shallow water (0-20 m). 

 In both spring and summer daytime samples they 

 were also in relatively shallow waters (5-40 m), 

 although they were not abundant at the shallowest 

 stratum (0-5 m). During day, L. exilis larvae were 



distributed in deeper water, particularly in spring, 

 when all larvae were collected below 30 m (Fig. 3). 

 At night, most L. exilis were shallower, between 5 

 and 30 m. 



Two species, Bathylagus ochotensis and Steno- 

 brachius leucopsarus, were collected only in spring 

 samples. These two species were predominantly col- 

 lected at different depths with B. ochotensis found 



617 



