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Pet Care Center: Fish

The PetMD Pet Care Center provides you with useful information about grooming, nutrition, training and wellness for your pet.


What is Osmoregulation?

Osmoregulation is the process of maintaining an internal balance of salt and water in a fish’s body. A fish is, after all, a collection of fluids floating in a fluid environment, with...
Category: Care

How a Fish's Immune System Works

All fish have an immune system to fight diseases, although the system is by no means as advanced as the ones found in mammals. The system breaks down into two main parts: protection...
Category: Care