270 
PACIFIC SCIENCE, Vol. XV, April 1961 
the pectoral fins are kept in slow motion and 
there are vertical undulations of the median 
fins. The color is darker than during the day, 
and large dark blotches are conspicuous between 
the vertical black bars on the body. A period of 
25 min. after darkness ensued was found to be 
necessary for the fish to reach a state when they 
could be lightly touched without fleeing. When 
lights were kept on in an aquarium for 24 hr., 
manini remained active, however they ceased to 
feed toward the end of this period and swam 
restlessly. A light was turned on after 10 ma- 
nini, 27 to 40 mm. in standard length, were 
allowed to sleep for 3 hr. From 13 to 28 min. 
were required for the fish to awaken, the small- 
est taking the longest time. 
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