Recent experiments have demonstrated the potential of the BioacousticAbsorption Spectroscopy (BAS) method for measuringnumber densities vs. fish length and species when combined with concurrent trawling data, and studying vertical migrations and schooling behavior of fish at mesoscale dimensions.. Measurements of transmission loss between moving or stationary broadband source(s) and vertical array(s) of hydrophones separated by several (up to ~10) km permits inference of absorption coefficients versus frequency and depth, and association of absorption lines with the resonance frequencies of fish swim bladders. BAS is environmentally friendly, as it can be implemented with source levels avoidance. The most significant results of BAS experiments will be reviewed, and possible approaches for use of the BAS method for routine scientific study and fisheries surveys of marine ecosystems will be considered.
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