Acoustical Behavior of Myripristis berndti — Salmon 
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Fig. 3. Oscillographs of grunt sounds and muscle potentials from hand-held Myripristis berndti. A. 
Two sounds from a normal fish; B, two sounds from the same fish after one sound-producing muscle has 
been removed. Note decrease in intensity. C, Two sounds from another normal fish; D, two sounds from the 
same fish after superficial muscles and bones over one sound-producing muscle have been removed; E, muscle 
potentials corresponding to four hand-held sounds recorded from two other fish. 
the field. The schools varied in size from 8 
to more than 100 fish, depending upon the 
space in the area in which they were located. 
Fish were found in one of three different habi- 
tats at depths to 9 m: under ledges which ex- 
tended 1-6 m deep and 3-20 m long, raised 
0.2-1. 5 m off the bottom; in caves with open- 
ings 1-3 m in diameter and variable inside 
dimensions; and in recesses within mounds of 
glomerate coral located within 1-3 m from the 
bottom. The same types of habitats were occu- 
pied by several populations found offshore at 
Black Point and the Ilikai Harbor. 
During 26 days of daytime field observations 
(between 0800 and 1730 hours) scattered over 
a 3 -month period the presence of schools in 
