2026-05-14 ワシントン大学（UW）
＜関連情報＞
- https://www.washington.edu/news/2026/05/14/a-new-method-could-help-washington-shellfish-farmers-control-a-pesky-shrimp/
- https://bioone.org/journals/journal-of-shellfish-research/volume-45/issue-1/035.045.0116/Immobilization-of-Burrowing-Shrimp-Neotrypaea-californiensis-by-Vibrocompaction-as-a/10.2983/035.045.0116.full
貝類養殖場における害虫防除戦略としての振動圧縮による穴掘りエビ（Neotrypaea californiensis ）の不動化 Immobilization of Burrowing Shrimp (Neotrypaea californiensis) by Vibrocompaction as a Pest Control Strategy for Shellfish Farms
Alan C. Trimble, Jennifer L. Ruesink
Journal of Shellfish Research Published:12 May 2026
DOI:https://doi.org/10.2983/035.045.0116
Abstract
Bioturbation by burrowing shrimp [Neotrypaea californiensis (Dana, 1854)] has restricted oyster farming on intertidal flats of Washington State. A novel mechanical control method was developed that immobilized shrimp in situ, collapsing burrows and causing shrimp to asphyxiate while trapped over several days. Vibrocompaction was achieved by inserting commercial high-cycle cement vibrators to 1 m depth and applying surface pressure. When a vibrator was deployed by an investigator standing on the sediment, efficacy improved with closer insertions of the vibrator until reaching 84% efficacy at a density of 12.5 insertions m–2 (0.3 m spacing). When a vibrator was deployed from a floating platform at 0.3 m spacing, shrimp densities were not reduced unless an investigator also stood on the sediment near each insertion. A custom floating platform with an open center area was designed to deploy six gang-mounted vibrators, lowered repeatedly to achieve 0.3 m spacing, while applying 34 kPa near each insertion to match the pressure of a person standing. At four sites spanning 0.4%–20% mud content, this vibrocompaction treatment reduced shrimp densities by 72%–98% relative to adjacent reference plots, which compares favorably with historical chemical controls. Similarly spaced insertions to 0.5 m depth at one site were less effective (87% versus 98%). This experimental method was necessarily time-consuming due to manual operation but has potential to be optimized and automated to control burrowing shrimp on shellfish farms.
