These acoustic methods are now expected to be useful for the long-range remote sensing of schools of fish as well as for distant ocean bottom characterizations.
Scientist use acoustic devices in place of older devices. 
( z1 use :ARG0 ( z2 scientist ) :ARG1 ( z3 device :mod ( z4 acoustics ) :ARG1-of ( z5 instead-of :ARG2 ( z6 device :ARG1-of ( z7 have-degree :ARG2 ( z8 old ) :ARG3 ( z9 more ) ) ) ) ) )