included decapods like Acanthephyra . Again, the red ones were 

 seen only below 700 m. 



Chaetognaths 



No diel pattern of distribution was seen for chaetognaths. 

 Although usually scattered, they were occasionally seen in groups 

 and appeared to be attracted to the lights. A few bright red 

 ones were noted below 800 m. 



Molluscs 



A few atlantid heteropods and Pterotrachea were reported 

 from shallow depths. Pteropods seen included one Gleba at 108 m, 

 and several gymnosomes at 856 m. Squid were common on most 

 dives, occurring below about 500 m during the day and much 

 shallower at night. Often we saw only puffs of ink as evidence 

 of their presence, but squid also swam directly at the lights and 

 hull of the sub. At least one large specimen was observed for 

 several minutes while eating a fish. 



Tunicates 



Tunicates did not seem particularly abundant. Larvacean 

 houses were scattered through the water column, and salp chains 

 occurred sporadically. The migratory Salpa aspera was seen near 

 the bottom; most other salps, including Salpa cylindrica and 

 Pegea sp., were in the top 300 meters. W. Hamner observed a 

 large red Pyrosoma during a dive in the Pisces VI after the Sea- 

 Link dives were over. 



Behavioral Observations 



Attraction of crustaceans to artificial light 



We intended to use the lights on the midwater platform to 

 attract animals over periods of several hours. During the one 

 dive when we observed the platform lights, few crustaceans were 

 seen, perhaps because it was moored too shallow. Later dives 

 were away from the platform because of weather. We noted 

 aggregation of hyperiid amphipods, copepods, euphausiids, squid 

 and sometimes chaetognaths around the sub's lights on almost 

 every dive. On dive 1421, I recorded the time course of 

 aggregation by crustaceans (mainly amphipods) when the sub's 

 lights were switched on after a period of darkness. The number 

 of animals seen (Fig. 2) is plotted against time elapsed since 

 turning on the lights. The form of this plot is similar to those 

 given by Ste. Marie and Hargrave (1987) for amphipods and other 

 deep-sea scavengers attracted to bait packages on the sea floor. 

 When we are able to measure swimming speeds of the amphipods, it 

 will be possible to estimate the distances from which they were 

 attracted to the light from the time course of their arrival. 



300 



