FISHERY BULLETIN: VOL. 78, NO. 3 



small to medium copepods and euphausiids, the 

 latter of which were taken frequently. 



Notolychnus valdiviae (Table 6) 



Notolychnus valdiviae occurs throughout the 

 depth range covered by the three deepest samples 

 as evidenced by the high numbers of specimens 

 available from each depth. With such large 

 catches, it is unlikely that data from the deeper 

 samples were seriously affected by catches in 

 transit to and from towing depth. 



Microzooplankton made up over half the diet at 

 90 and 110 m and about one-fourth at 170 m (Table 

 2). These were almost all Oncaea. If the ASV's are 

 roughly corrected for undersampling, they are 

 still relatively high at 90 and 110 m. 



Most of the remaining prey were medium to 

 large copepods; P. xiphias, P. abdominalis , C. lon- 

 gimana, and aetideids were important at one or 

 more depths. Euphausiids were rarely taken. 

 ASV's for items from 90 and 110 m were mostly 

 rather low (Table 2). At 170 m ASV's for a large 

 fraction of items and prey types were high (> 0.80 

 m^) mainly due to high values for P. xiphias, C. 

 longimana, and 2-3 mm aetideids. This plus the 

 lower proportion of microzooplankton in the diet 

 at 170 m indicates increased preference for larger 

 prey 



Ceratoscopelus warmingi (Table 7) 



Ceratoscopelus warmingi took a wide variety of 

 sizes and taxa of prey. Small fractions of the diets 

 of the large fish were microzooplankton — mostly 

 Oncaea spp., but including several species of small 

 calanoids, ostracods, and gastropod veligers. On- 

 caea and small ostracods made up over a third of 

 the diet of the small fish from 90 m (Table 2). If the 

 ASV's for Oncaea are decreased by a factor of 4 to 

 roughly correct for undersampling, preference 

 equivalent to that for larger prey is indicated. 

 ASV's for other microzooplankton were very low. 

 All sizes of calanoids and small to medium os- 

 tracods were taken, but ASV's were usually low. 



Many prey items were large and most of these 

 had high ASV's, resulting in large fractions of the 

 prey from large fish at 70 and 110 m having high 

 ASV's (Table 2). Euphausiids, decapods and their 

 larvae, large amphipods, and ostracods were 

 taken frequently, but fish, siphonophores, 

 heteropods, and polychaetes (all >5 mm) were also 



Table 7. — Stomach contents of Ceratoscopelus warmingi. For- 

 mat as in Table 4. 



Other prey: 



70 m — 1 Undinula darwini (0.69). 1 Heterorhabdus papilliger (0.10), 

 — 1 Augaptilidae (0.52), 1 megalopa (3.20), 2 stomatopod larvae 

 — (x), 1 Ctenophore (»). 

 90 m — 46-62 mm — 1 Calanus tenuicornis (0.01), 2 Clausocalanus spp. 

 (0.03), 1 Pseudocalanidae (0.55), 1 Ischnocalanus sp. {^), 

 1 Aetideidae C <2.0 mm (0.02), 1 Euchaeta media (0.09), 

 1 Scolecithrix bradyi (0.04), 2 Candacia longimana (0.14), 

 5 Candacia spp. CV, CVI (0.09), 1 Caridean larva (0.23), 

 1 Penaeidean larva (0.33), 2 Anomuran larvae (x), 1 Chaetognath 

 (0), 6 Heteropods (1.14), 2 Gastropods (0.16). 

 110 m — 2 Nematoscelis spp. (2.20) , 1 Nematobrachion sexspinosus (23.8). 



present. Items listed as "fish" (Table 7) were all 

 epipelagic larvae or juveniles, but C. warmingi 

 also frequently eats Cyclothone, which it en- 

 counters only during the day. Results of studies of 

 feeding chronology (Clarke 1978) indicate that 

 Ceratoscopelus warmingi takes such large items 

 both day and night. While it is possible that the 

 other large items mentioned above could have 

 been taken at depths other than those sampled 

 and thus that the high ASV's are artifacts, these 

 items do cooccur with C warmingi at the depths 

 sampled and those recorded were relatively fresh 

 and intact in stomachs offish collected in the latter 

 half of the night. {Cyclothone were, however, 

 eliminated for calculations in Table 2.) Even al- 

 lowing for the probability that ASV's of some of the 

 largest prey types were overestimated due to 

 avoidance of the plankton nets (see Methods sec- 



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