All acoustic surveys undertaken to estimate fish stocks must be supplemented with catch data to determine fish species and fish size distribution.
The combination of acoustic and trawl sampling is an established methodology for marine surveys. The comparison of trawl sampling with acoustic recordings is dependent on information about trawl position, opening, depth, bottom contact, catch and water temperature. Simrad provide a range of small and robust sensors measuring the conditions of the trawl or other fishing gear used for biological sampling.
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