Salmon Scale Project
https://www.fisheriesireland.ie/research/national-salmon-scale-project
This is a very good site for all anglers so that we can help with the collection of scientific data for the research on the life and growth rates on wild salmon.
This can be done even if you are a catch and release angler. All instructions are on the page.
(The Treasurer has some sampling envelopes for early anglers.)