Echogram illustrating the ascending and descending phases of the diel migrations (warmer colors) through the water column. The downward and upward migration activity occurs during dawn and dusk periods. The color scale represents the strength of the sound that is reflected by the organisms in the water column from the ship-based sonar. Cooler colors show less sound reflected and warmer colors show more sound reflected, indicating the presence and density of animals.
Echogram
Image courtesy of Kevin Boswell, Florida International University and the DEEPEND (Deep Pelagic Nekton Dynamics of the Gulf of Mexico) Consortium.. Download largest version (jpg, 112 KB).

Echogram illustrating the ascending and descending phases of the diel migrations (warmer colors) through the water column. The downward and upward migration activity occurs during dawn and dusk periods. The color scale represents the strength of the sound that is reflected by the organisms in the water column from the ship-based sonar. Cooler colors show less sound reflected and warmer colors show more sound reflected, indicating the presence and density of animals.

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