Prevention, early detection, and rapid response are the most cost-effective approaches to preventing the spread of invasive tunicates and associated invasive species.

This illustrated guide is intended to enhance the early detection and rapid response of invasive tunicates by providing basic identification of nine of the most invasive tunicates posing a threat to the marine infrastructure, ecology, and economy of the Pacific Northwest coast. Sections on identification, similar species (those that may look similar, including natives), and ecology describe each of the nine invasive tunicates, and current distribution maps indicate areas where they’ve been found.

Developed by Lorne Curran. Introduction by Samuel Chan. Layout by Jennifer Lam, with review by Amy Benson of the US Geological Survey and editorial assistance from Rick Cooper, Oregon Sea Grant. Contacts: Lorne Curran at, or Samuel Chan at  

Lorne Curran and Samuel Chan
Short Description: 
A field guide to invasive colonial tunicates in the Pacific Northwest
Product Number: 
Entry Date: 
Friday, August 9, 2013
32 pages
Size and Format: 
Printable booklet; accessible .pdf
Full-color illustrations
Year of Publication: 
How to Order: 

Available only online: accessible .pdf (26 MB) | printable booklet .pdf (5 MB)