An investigation was conducted into the impacts of mechanical mussel spat harvesting on toheroa (Paphies ventricosa) and tuatua (Paphies subtriangulata) at Te Oneroa-a-Tōhē (Ninety Mile Beach). There was no detectable impact when these surf clams were either fully or partially buried. However, beach cast clams lying on top of the sediment on their sides were vulnerable to crushing by vehicles.
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