Matsui: Description of young platytroctids from northeastern Pacific Ocean 



219 



Fisheries Investigation) station data from the area 

 show seasonal changes in temperature below 300 m 

 averaging less than 0.5°C (Lynn et al. 1982). Oxygen 

 values of less than 1 mL/L occurred at these depths 

 (Fig. 8). Gill filaments are highly developed (for platy- 

 troctids) in both species and are well adapted for this 

 environment (Matsui and Rosenblatt 1987). 



Acknowledgments 



This study was supported by the Marine Life Research 

 Program, the Scripps Institution of Oceanography's 

 component of the California Cooperative Oceanic 

 Fisheries Investigation. 



I thank Dr. Richard Rosenblatt for loan of specimens 

 from the SIO Fish Collection, and his staff for cura- 

 torial assistance. I am grateful for advice received from 

 Dr. Geoffrey Moser, and for his comments on an earlier 

 draft; and to Barbara Sumida MacCall for useful com- 

 ments on illustrations of the larvae and juveniles. Other 

 figures were prepared by the Marine Life Research Il- 

 lustration department. I wish to thank Ron McCon- 

 naughey for his able assistance during the MLRG 

 cruises, and other participants too numerous to be 

 named here. 



Citations 



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