Abstract
This paper describes result of an interdisciplinary experiment, BAS II, which included coincident measurements of broadband (0.3–5 kHz) transmission loss (TL), depths and length distributions of fish, geoacoustic parameters, and continuous temperature profiles. The objective: demonstrate the accuracy of bioacoustic parameters of fish inverted from TL data. TL measurements were conducted between a fixed source and a fixed 16 element, receiving array that spanned most of the water column. Trawls revealed that the dominant species were sardines and anchovies. The TL data at night exhibited absorption lines at resonance frequencies associated with 15 and 8 cm long sardines, and 11, 9.5, and 5.5 cm long anchovies at 12 m, in good agreement with coincident trawl and echo sounder measurements. TL data during the day exhibited an absorption line associated with sardine schools. Concurrent inversion of bio and geoacoustic parameters of nighttime data was based on the Genetic Algorithm. The layer of fish was charac...
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