A few months ago, when we had ice in the marina, I posed the question about fish getting headaches.
I have another for you.
Do they knock themselves out?
On several occasions when we have been taking Maggie up for her final wee, we’ve heard some almighty splashes beneath us. Apart from the river rat we saw leaving a wake, we were convinced it was a large fish, probably carp, though we didn’t actually see any.
We know there are fish in the water here as several owners dangle their lines off the back of their boats, and we have witnessed several landings of decent sized catches, though to be honest, I doubt very much if we’d actually eat anything caught here.
The night before last, I was on wee duty, and heard a disturbance in the water that was definitely not a duck, but it was dark and too quick for me to see and by the time I’d got the torch out of my pocket, whatever it was had gone.
Yesterday morning, something was floating close to the bank, and it was a fish.
A rather large but very dead fish actually, though it didn’t appear to be mangled or chewed, and as I hadn’t seen either of the Marina herons lately, I wondered if perhaps it had leapt out of the water the night before, knocked itself out, and then drowned.
pensitivity101 
No idea if they can knock themselves out – but it would seem like it could be a possibility!
How sad. An interesting question though.
Makes you think doesn’t it, I mean for there not to be a mark on it.