Thanks for the info...do you know how would you access the outflow of the river at Bunratty?
I did go out to Ballysteen pier on Saturday for about 2 hours but it was late-ish when I got there and the tide was still a ways off full in (I left around 10:30 and it was just starting to lap off the slipway, so I reckon another hour to full in)
Caught about 10 crabs

, mostly 2 every cast - one on the bait and one on the weight. I think I got a hit just before I left as I got what I assumed was just an over-enthusiastic crab bite, so I ignored it - but 2 minutes later when I reeled in to pack up, the hook was bare. None of the other crabs that night had taken the entire strip, they had just mangled it...so I don't know....being mostly a freshwater fisherman except for pollock/wrasse fishing from rocks, this estuary fishing is all new to me - never had to contend with crabs before. I have to lose the idea that if the rod tip moves, it's a fish.
It certainly does feel like it will produce fish so if the tides are right, going to do it again this weekend for sure. Certainly after the sun went down there were a lot of fish jumping just beyond the pier, sea trout I suppose.
And I did see some huge cruising mullet and a large sea trout at Pallaskenry pier a few days previously whilst walking the mutt.