Hydroacoustic detection of food waste - a method to estimate maximum food intake of fish populations in sea cages

摘要

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. Fora certain amount of food, the echo energy decreased when pellet size increased. Therelationships allowed hydroacoustic detection of small amounts of food waste. Maximumfood intake of a salmon population was determined as the amount of food delivered by thefeeder before food waste was detected.