Almost 3,000 tagged blue swimmer crabs have been released into popular crabbing waters in recent months by our researchers.
Their aim is to develop a better tag and to study the growth and movements of crabs in the Swan and Canning Rivers, Leschenault Estuary and Geographe Bay.
Some crabs carry only tags glued to their upper shells, others have both glue-on and the new smaller yellow T-bar flesh tags, and the rest have only T-bar tags. Researchers hope that as the crabs moult and lose the glue-on tags, the T-bar tags will stay in place.
Fishers who catch a tagged crab should phone the number on the tag and report the date, location and depth of capture, crabbing gear used, the tag number, size and sex of the crab, whether any eggs were visible and if the crab was kept or released.
There is also a small reward for people who report data from their tagged crabs.
If you would like to help researchers even more, you can volunteer to record catch data in a logbook as part of our True Blue Swimmer Supporter project.