FISHERY BULLETIN: VOL 76. NO. 3 



200- 



400 



E 



r 



a. 



LU 



Q600 



800 



1000 



9? 



12 



"^I — ' — ^ — WMVrry y^r-- ^ 



' * Mt^ nm* TTTT* ITTT ^T TT* T 



13 



•lo 00900 ^oo^oj 

 ' ' '  " I' '•  4 _, 



looo 



14 IS 16 17 18 



MANTLE LENGTH. mf 



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J L-v-l- 



20 21 24 



Figure 3.— Vertical distribution of 

 Pterygioteuthis microlampas. From R. E. 

 Young (1977). Symbols as in Figure 1. 



Photosensitive Vesicles 



The organs have been described by R.E. Young 

 (1977). They are essentially the same as in 

 Pyroteuthis addolux. 



Pterygioteuthis giardi Fischer 1895 



Vertical Distribution (Figure 4) 



During the day 30 specimens captured from 

 both trawls indicate a depth range from about 390 

 to 525 m; over 907^ of the captures were made 

 between 390 and 450 m. One IKMT tow captured 

 eight badly damaged specimens at 630 m, well 

 below their zone of maximum abundance. The 

 previous tow had captured six specimens at 390 m 

 that were in excellent condition; specimens from 

 the deeper tow probably are contaminants. The 

 depth distribution of this species may be biased by 

 the relatively low sampling effort between 350 

 and 400 m. 



At night, 39 captures with the Tucker trawl 

 indicate a depth range of 15 to 180 m; over Ih'^c of 

 the specimens came from 15 to 50 m. IKMT data 

 lumped into 50-m increments (Table 1) show the 

 maximum abundance at depths of to 100 m. 



Photosensitive Vesicles 



The organs are essentially the same as in 

 Pyroteuthis addolux. 



Ahralia trigotiura Berry 1913 



Vertical Distribution (Figure 5) 



Fifty specimens were captured by both trawls. 

 Excluding presumed contaminants, the day cap- 

 tures were made between 390 and 650 m with 

 nearly 809f between 450 and 560 m. At night cap- 

 tures were made between 30 and 200 m with over 

 759^ between 50 and 100 m. 



800 - 



Figure 4. — Vertical distribution of Pterygioteuthis giardi . Sym- 

 bols as in Figure 1. 



588 



200 



1000 



T-' — r 



T r- 



'O o o o 



_l I  . I 



22 26 30 34 



MANTLE LENGTH, mm 



42 



Figure 5. — Vertical distribution oiAbralia trigonura. Symbols 

 as in Figure 1. 



