I was just out feeding the Barramundi and even though the water is only at about 18 degrees they seemed pretty hungry.. While tossing in the feed they were in a bit of a frenzy shooting up from the bottom of the tank, grabbing the pellets. Then suddenly the floating glass thermometer disappeared, nothing to unusual about that, I expected it to float back up again at any second, except that it didn't...
Then I noticed a barra swimming around deep in the tank without an inch of the thermometer poking out the end of it's mouth..
It must have had about two thirds of the thermometer stuck down it's gullet...
I watched it swim around like this for about 5 minutes and I began to wonder what the hell I was going to do to try and help it before it finally managed to spit it out..
From now on I think the thermometer will be going into the drain tank...
Who said barra won't feed and will die at less than 20? Codswhallop! 
Must say, I have often thought thermometers must look pretty tasty to a fish 