We all hear about the mammals and birds that are no longer present in each of our localities.
Why do we not hear of fish, or crustaceans that are no longer in our localities?
What species of fish no longer is found in your area, that you know was there before?
I will kick it off with sole in the Brighton to Clontarf area, haven't seen one in decades now but were once common. Not Flounder, they are still present.
Let's see what sort of list can be compiled.