To take your own body temperature, you stick a thermometer under your tongue.
To take a dog’s temperature, you stick the thermometer up its bum.
So, how do you take the temperature of a fish?
The answer is…
🙂
You stick the thermometer in 😐
… the water 😛
That’s right, most fish a poikilotherms (cold blooded), and so their body temperature is the same as the surrounding water. So, their metabolic rate and activity levels are highly dependent on the temperature of its environment. Some can cope with seasonal changes, whereas most tropical fish (including the Siamese fighting fish) require you to maintain water at a tropical temperature of 25-28 degrees Celsius.
