Hydroacoustic detection of food waste - a method to estimate maximum food intake of fish populations in sea cages
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A linear relationship between echo energy and amount of salmon dry food was established. Measurements were carried out both for food batches (5-400 gram) and single pellets. For a certain amount of food, the echo energy decreased when pellet size increased. The relationships allowed hydroacoustic detection of small amounts of food waste. Maximum food intake of a salmon population was determined as the amount of food delivered by the feeder before food waste was detected.