Applications scientifiques

Multifrequency echo sounder operation: Mackerel

The echogram below shows schools of mackerel. These are observed using frequencies 18, 38, 70, 120, 200 kHz on a Simrad EK60 scientific echo sounder.

Echogram examples:

Simrad EK60: Five frequencies on mackerel

The schools of mackerel can be seen in the left part of the echogram. It is clear that the echo from the schools becomes stronger with increase in frequency. This response is unique to mackerel and can be used to discriminate mackerel from other fish species.

 
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