COASSTer Rick found this biofouled item during his survey of Moore Creek South (Oregon) in September. If you know what it is, share your thoughts in the comments or by e-mailing firstname.lastname@example.org.
Here’s Rick’s description: “A cylinder with a rounded bottom and a detachable top. Length is 16cm; lid is 4cm tall; diameter is 7cm. Material is thick (4mm) translucent plastic. A set of 3 vertical holes on the four sides with a hole in the top and bottom. Has two attachment points on one side.”