Fish

PetMD Editorial

How Fish ReproduceReproduction in fishes varies widely from species to species. In every case, the fish must use an amount of metabolic energy required to reproduce (i.e., to actually spawn and look after...

PetMD Editorial

Digestive DisordersMost digestive disorders in fishes are caused by parasite infections. However, not all parasites cause problems for fishes -- some live in a symbiotic relationship with the fishes. Symptoms...

PetMD Editorial

Environmental Gill Disorders in FishGills are special organs which allow fishes to breathe underwater. However, if a fish's environment is not well maintained, it can develop gill disorders. Of these, the three main disorders are gas bubble disease, carbon dioxide toxicity, and hydrogen sulfide toxicity. 1. Gas bubble disease usually occurs in cold water systems. When the water...

PetMD Editorial

Jessie M Sanders, DVM, CertAqV When keeping aquarium fish, a lot of time and research goes into what is normal versus what is abnormal. It can be challenging to distinguish. Among these challenges are...