Abstract

A lidar system was used in a seawater tank to measure the average diffuse reflectivity of live sardines. Diffuse reflectivity was measured to be 10% for a copolarized laser return and 3% for a cross-polarized return. We used these calibration measurements to infer the density of sardines in areas of the Southern California Bight from vertical profiles obtained with the lidar mounted on a ship. Within schools densities up to ∼0.01 kg m-3 were observed. During hourly survey periods total habitat densities up to ∼2 × 10-3 kg m-2 were observed.

© 1997 Optical Society of America

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