PADILLA BAY — When low tide exposes the dark mud and green eelgrass of Padilla Bay, the shells of a critter that doesn't belong here are a more common sight than those of clams and crabs that do.

It's the Japanese mudsnail, or Batillaria, which ranges in size and color but generally has a narrow, spiral shell about the size of a pen cap. 


Padilla Bay snails

The non-native Japanese mudsnail has been in Padilla Bay since about the 1930s, when they were brought to the area inadvertently with Pacific oysters imported and grown here.

Padilla Bay snails

Roger Fuller (kneeling), Natural Resources Stewardship and Restoration coordinator at the Padilla Bay National Estuarine Research Reserve, gives directions to volunteers Thursday during a survey of non-native Japanese mudsnails at Padilla Bay near Bay View.

New Zealand mudsnail presence

The yellow dots mark where the tiny but highly invasive New Zealand mudsnails have been found in Skagit County.

— Reporter Kimberly Cauvel: 360-416-2199, kcauvel@skagitpublishing.com, Twitter: @Kimberly_SVH, Facebook.com/bykimberlycauvel

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