GARTNER ET AL.: LANTERNFISHES 



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some of those for night, though overall densities 

 were higher for night. No evidence was found for 

 members of the population remaining at depth at 

 night. 



Diaphus dumerilii: N = 1,279, 

 12-53 mm SL, Juvenile-Mature Adult 



This species had the shallowest daytime depth of 

 capture (300 m) and was the weakest migrator of 

 all seven abundant species (Fig. 4a); maximum depth 

 during the day was 600 m, with no discernible abun- 

 dance peak within the daytime range. Nighttime 

 captures were as shallow as 50 m, with peak abun- 

 dance between 75 and 125 m (maxima 39 and 47 

 specimens/lO"* m^, respectively). There was some 

 evidence of nonmigration of juvenile members of the 

 population remaining at depth at night (Table 5). 



Myctophum affine: N = 893, 



12-58 mm SL, Juvenile-Mature Adult 



Our only discrete record of capture for this species 

 during the day was from 500 m. The nighttime ver- 

 tical profile for M. affine was distinctly different 

 from that of the other abundant species. A strong- 

 ly bimodal pattern was evident, with a 75-155 m 

 component of the population with a small peak at 

 105 m, and the majority of the population at night 

 (97% of our catch) between the surface and 5 m. 

 Most of these shallow individuals were at the sur- 

 face (95% of 0-5 m captures), and on calm nights, 

 it was possible to dip net this species. A maximum 

 of 102 specimens/ 10"* m^ was recorded at the sur- 

 face at night (Fig. 4b), and our data indicated that 

 the entire population vertically migrated. 



Analysis of M. affine size with depth for night- 

 captured individuals showed that in the to 5 m 

 depth strata, juveniles of 18.5 mm mean SL entered 

 the very surface waters, while specimens approx- 

 imately twice their size (x = 37.2 mm SL) occurred 

 just below them at 5 m depth (Table 5). 



Benthosema suborbitale: N = 687, 

 10-30 mm SL, Juvenile-Mature Adult 



The daytime depth range was well defined be- 

 tween 400 and 600 m. Nighttime distribution was 

 bimodal, with a migratory group between 50 and 105 

 m and a group of nonmigratory juveniles (Table 5) 

 remaining at daytime depths. The diel vertical pro- 

 file showed that this species was not particularly 

 concentrated at any depth (Fig. 4c) and, in contrast 

 to all other abundant and common species, B. sub- 



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