Aquarium lowers water levels after feeding turtles brussel sprouts

[T]he turtles, like humans, are prone to heavy bouts of flatulence after eating the vegetables.

Last year a turtle at a Sealife Centre triggered overflow alarms in the middle of the night after the splashes from gassy bubbles hit overflow sensors.

Now the Yarmouth turtle tank -12 feet in depth and width holding 250,000 litres of water along with George the 3ft long green turtle – has been partially emptied for the festive season.

I wonder how this affects their buoyancy and swimming speed.