Do fish get thirsty?

In this short article, we will answer the question “Do fish get thirsty?” and will show you what the fishes eat.

Do fish get thirsty?

When it comes to feeling thirsty, freshwater and saltwater fish behave somewhat differently. 

To begin with, it’s critical to realise that they perform osmoregulation, a homeostatic mechanism essential to their life that makes sure the body only stores the right quantity of water and salts.

Fish from freshwater

Fish from freshwater bodies of water do not experience thirst. This is due to the fact that they inhabit water with salt concentrations that are lower than those found in animal cells. 

The animal typically does not need to sip water because fresh water tends to permeate its entire surface.

Oceanic fish

Fish in salt water do experience thirst. Marines (bones) must drink water since the environment they are in contains more salt than their own bodies. They also carry out osmoregulation to prevent dehydration.

Through the activity of the cells found in the gills, they sip the water and then flush out the extra salt. These species produce concentrated urine, unlike freshwater fish, which emphasises the significance of the kidneys in this regulatory mechanism. 

The organism will get dehydrated and experience internal system deregulation, which can eventually result in death if it is unable to exchange salts with the environment during osmoregulation. 

Sharks, rays, and other saltwater cartilaginous fish do not experience thirst, though, as urea in their blood causes a higher concentration of chemical substances in their blood than in the oceans. 

As a result, even though they live in a saltwater environment, they tend to gain some water by osmosis and do not become dehydrated when they don’t drink enough water.

Domestic fish

Drinking water functions similarly to when fish are released in their natural habitat when considering those who keep fish at home. 

To ensure the welfare of these animals in a man-made environment, it is crucial to provide all the required conditions, particularly good water quality.

What do fish eat?

Fish can be omnivores, herbivores, and carnivores, and have different types of diets, just like other animals. And the separate fish feed is required for each of them. We separate a list of requirements for each kind of species:

  • Fish that are carnivores: These fish mostly consume smaller fish, insects, crabs, amphibians, and other animals. Examples of species include Oscar, Acara, and Betta. 
  • Omnivorous fish devour a variety of foods, including plants and small animals, to obtain their nutritional needs. Carp, guppy, and tants are a few examples of species. 
  • Planktophagous fish eat plankton. Examples of these species are silver carp and tilapia. 
  • Detritivorous fish eat various organic waste products including animal excrement. They may eat benthic species like bug larvae and are also known as benthophagous. Zebra, shrimp, and loricariidae are a few examples of species.

Live or dead food

Your aquarium fish can be fed in one of two ways: with feed or with live food. Even the most well-known species, such as betta, tetra, kinguio, and cichlids in general, have rations tailored expressly for their respective species’ food types.

It’s also crucial to pay attention to the amount of food placed if kibble is the model chosen to feed the pet because too much food can hurt the animal and, in some cases, cause it to die. 

Additionally, it is important to keep in mind that various species have distinct feeding preferences and require different feeds. Examine the popular models now available.

  • Granulated or flake feed is a kind of light food that floats on the water’s surface, making it ideal for animals that consume it.
  • Compacted feed sinks to the bottom of the tank because it is heavier. It is perfect for fish that like to eat deeper, like catfish.
  • Fish that typically eat in the middle of the aquarium benefit greatly from pellet feed, which is stuck in the aquarium glass.

The option of feeding the fish live food is also available. Pets shouldn’t eat this kind of food every day, but it can be given to them occasionally—especially if they are carnivorous fish. The optimal solution for this is to offer larvae and tiny crustaceans.


In this short article, we answered the question “Do fish get thirsty?” and have shown you what the fishes eat.


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