FISHERY BULLETIN: VOL. 73, NO. 4 



Table 4.-Micronekton standing stock, mean number of or- 

 ganisms per 100 m'^ ocean surface. Standard deviation in 

 parentheses. 



Group 



0-1,200 m 



Day 

 0-400 m 



Night 

 0-400 m 



Total micronekton 898.07 (149.50) 166.27 (16.45) 477.94 (69.27) 



Total fishes 

 Total Crustacea 

 Cepholopoda 

 Other invertebrates 



508.00 (133.50) 



289.84 (54.25) 



8.44 (2.04) 



91.78 (25.22) 



29.71 (7.48) 153.41 (60.43) 



15.32 (4.92) 240.04 (13.91) 



3.60 (1.98) 5.95 (1.81) 



117.63 (19.26) 78.52 (22.71) 



No. organisms 



caught 

 No. tov\/s 



12,037 

 9 



1,576 

 6 



5,136 



7 



Table 5.-Micronekton standing stock, mean biomass, grams wet 

 weight per 100 m^ ocean surface. Standard deviation in 

 parentheses. 



Group 



0-1 ,200 m 



Day 

 0-400 m 



Night 

 0-400 m 



'Calculated assuming 7.7 m^ net mouth, full 10-foot IKMT mouth. 

 'Calculated assuming 0.785 m^ net mouth, cod end mouth area. 



abundant groups are comprised of small in- 

 dividuals (Figure 3a). Biomass estimates for 

 zooplankton in deep tows ranged from about 10 to 

 100% of the total micronekton, depending on which 

 mouth area was used for calculation (Table 5). 



% NUMBERS 

 5 15 25 35 



% BIOMASS 



15 



JMYCT. 

 CARID. 

 CEPH. 

 ANGUI. 

 CYCLO. 

 M FISH. 

 CNID. 

 TUNIC. 

 PENAE 

 STERN. 

 EUPH. 

 O STOM. 

 O. GON. 

 MYSID. 

 M INV. 

 M. CRUS. 



% NUMBERS 



% BIOMASS 



15 



J L_ 



25 



J L_ 



C N I PI 



35 



I . I . 



I M INV 

 TUNIC. 

 M. FISH. 

 ANGU I. 

 CEPH. 

 EUPH. 

 CYCLO. 

 O. GON. 

 STERN. 

 MYCT. 

 CARID. 

 PENAE. 



% NUMBERS 



% BIOMASS 



20 



30 



MYCT. I 



CARID. 

 O GON. 

 PENAE. 

 TUN IC. 

 CE PH. 

 O. STOM. 

 EUPH. 

 CNID. 

 M. FISH. 

 STERN. 

 MYSID. 

 ANGUI. 

 M. INV 

 CYCLO. 

 M. CRUS. 



Figure 3. -Mean faunal composition by group as percent of total 

 micronekton standing stock, number of organisms and wet- 

 weight biomass. a. Deep-tows, 0-1,200 m.b. Shallow-day tows, 

 0-400 m. c. Shallow-night tows, 0-400 m. ANGUI. = An- 

 guilliforme.s, CARID. = Caridea, CEPH. = Cephalopoda, CNID. 

 = Cnidaria, CYCLO. = Cyclothone, E\]Vli. = Euphausiacea, M. 

 CRUS. = Miscellaneous Crustacea, M. FISH. = Miscellaneous 

 fishes, M. INV. = Miscellaneous invertebrates, MYCT. = Myc- 

 tophidae, MYSID. = Mysidacea, 0. GON. = Other Gonostoma- 

 tidae, 0. STOM. = Other Stomiatoidei, PENAE. = Penaeidea, 

 STERN. = Sternoptychidae, TUNIC. = Tunicata. 



The small euphausiids (<1 cm) which were sorted 

 into the zooplankton group constituted 3.9 g wet 

 weight and 831 individuals/ 100 m^ ocean surface 



730 



