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Something elso to add to my comment about noise and vibration. The same person also believed that a large, slow turning, cavitation free, prop was a good fish attractor. He could account for several large billfish (world record) that he had caught in such a propwash.
So there is something to be said about some boats raising fish better than others. Raising being seperate from not scaring away, and I find it difficult to believe that any diesel engine attracts fish. I think it has more to do with water flow and smooth regular rythmic vibration.
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