How Fish Maintain Homeostasis in Different Water Temperatures

How Fish Maintain Homeostasis in Different Water Temperatures
••• stuffed fish image by Aaron Kohr from

Fish are cold-blooded creatures, and most of them cannot control their internal temperature, like humans. In order to stay at a healthy temperature, or obtain temperature homeostasis, the fish seek warmer or colder water. Some fish also have additional mechanisms to keep a healthy temperature.

Heat Creation

Fish, like all animals, create heat from metabolic activity. Metabolic activity includes breaking down food and movement.

Heat Loss

Fish lose metabolic heat through their gills. This happens because the heated blood that runs though vessels in the gills comes into close contact with the colder water outside, and the heat is lost to the water.


Most fish are poikilothermic, which means their body temperature changes with ambient temperature. In this case, it refers to the temperature of the water around them. Poikilothermic fish control this by moving from colder water to warmer water. An example of this is when a fish moves to the bottom of a pond when the top of the pond is frozen over.

Exceptions to Pure Poikilothermy

Certain fish, such as sharks and tuna, can control their body temperature using a paired blood vessel system, where warm blood going to the gills swaps heat to colder blood coming back from the gills, thereby keeping a higher blood temperature than pure poikilothermic fish.

Related Articles

How Does Weather Affect Fish Behavior?
How an Incubator Works
What Are Two Examples of Responses Organisms Display...
Difference Between a Regulator & a Conformer
How Does Weather Affect Fish Behavior?
What Is the Different Between Freshwater Vs Saltwater...
Does Kinetic Energy Increase in a Drink When Ice Melts?
Fish Behavior Science Fair Ideas
5 Characteristics That All Fish Have in Common
How an Incubator Works
What Is the Goal of Homeostasis?
Types of Mixing Valves for an Oil Furnace Boiler
How Does an Octopus Breathe?
The Effect of Temperature on Cell Membranes
What Are the Six Human Life Processes?
Organ Systems Involved in Homeostasis
Is Carbonation Affected by the Temperature?
What Are the Advantages & Disadvantages of Being Endothermic?
How to Separate Ink From Water
How to Calibrate a Dial Thermometer

Dont Go!

We Have More Great Sciencing Articles!