Thread: Black trout

Took my son fishing at Lake Opuha today and saw a very dark coloured fish sitting almost stationary about a metre from the waters edge. Had no interest in looking at a spinner and wasn't worried that we were standing right next to it.
I finally tossed a rock in front of it and it slowly moved away.
We continued around the lake edge and on the way back we found the same fish in the same place, hardly moving and not worried about us once again.
My son wanted to net it but I wouldn't let him as there's no way I was going to loose my ute over a manky fish.
Any thoughts on way it was so lethargic? Possibly blind?
Why so dark?