Freshwater Fish

The difference between Freshwater Fish and Saltwater (marine) Fish is subtle. That difference is controlled by a process called Osmoregulation. Fish are literally small parcels of fluids within a large fluid environment. In both saltwater fish and freshwater fish there is a difference in the salt concentration of the environment and their body fluids. However because of Osmoregulation, the salt in either fish's body remains constant and at about the same level. Some most viewed examples of Freshwater Fish are listed here. Or to read more about the differences click here.

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Freshwater Species: African Cichlids | American Cichlids | Angel fish | Barbs | Bettas | Catfish | Corydoras | Danios | Discus | Gold fish | Gouramis | Hatchets | Killifish | Livebearers | Loaches | Minnows | Fish Tropical | Plecos | Rainbowfish | Rasboras | Sharks | Tetras |

Aquarium Fresh Water Fish

 

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AQUARIUM FISH MOST VIEWED

Gold fish

Gold fish belong to a large family of fish known as the family Cyprinidae. This family includes other types of fish such as koi, barbs, danios, rasboras and american minnows. Many aquarium cyprinids are warm water species, but Gold fish and koi are essentially coldwater fishes. All of the varieties of Gold fish we see today are a result of mutation. It is generally agreed that it was the Chinese who first began successfully breeding this fish.

Oscar fish

Oscar fish belong to a large family of fish known as the family Cichlidae. The 1,000 or more members of the cichlid family are native to Central and South America, Africa, Asia and parts of the USA. Most will acclimatize well to domestic tap water, although some species, such as the Discus, need carefully controlled water.

Freshwater Angelfish

In the world of the aquarium fish hobby, it is safe to assume that most aquarists have kept the common Angel fish (Pterophyllum scalare) in one form or another. Since the introduction of Angel fish to the American public in the early 1900s, numerous color forms have been made available to the wholesaler, retailer and aquarium consumer due to the hard work and painstaking care of breeders around the world. Combining the many available color and pattern strains with the traits of standard, veiltail or long veiltail finnage has added to the many lovely variations of the common Angel fish.

A favorite of aquarium beginners Betta fish belong to a large family of fish known as the family Belontidae. Fishes within this group of families often inhabit oxygen-depleted waters of Africa and Asia. They posses an auxiliary breathing organ that enables them to use atmospheric air gulped at the surface. This "Labyrinth organ" is a folded mass of bone and capillary rich tissue, situated internally near the gills. Its function is to store air and extract oxygen.

Freshwater African Cichlids

While there are some river species available, including the kribensis, most African cichlids come from three large lakes in eastern Africa: Lake Malawi, Lake Tanganyika, and Lake Victoria. Some say that the colors of  African cichlids rival those of saltwater fish. Adult males of many species display the most iridescent blue you will ever see. Yellow, orange and crimson are also common. Coming in a vast array of colors, shapes and sizes, some up to 3' long,  African cichlids are freshwater aquarium fish, but they are not for community tanks; they are fiercely territorial and highly predatory.

Arowana

Indigenous to the flood plains of the Amazon River Basin in South America It can survive short times out of the water breathing air by utilizing its swim bladder.

For a great source of information we use and recommend DATAFISH: aquarium fish database at website http://www.solodvds.com/. Solodvds maintains this Internet site as a service to the Internet community. It provides the very best pictures and profiles of popular aquarium fish from all over the world. DATAFISH: is an incredible store of easy to read profiles. It includes information for both fresh and saltwater aquarium hobbyists, and you don't have to be a marine biologist fluent in Latin to read it. Click on

Back to the difference between Saltwater and Freshwater Fish. The salt in either fish's body remains constant and at about the same level. So for a fish body to work efficiently, it must maintain its internal salt water balance at a constant level, despite the salt concentration in their environment's water. To keep their salt levels constant, membranes that permit osmosis primarily in the fish's gills, evolved and adapted to the salt concentration in the environment. These membranes regulate the amount of salt that seeps through the membrane into the fish's body fluid to maintain it's constant salt level.

Another difference between freshwater fish and saltwater fish is their breathing apparatus. Like us, fish require oxygen for life. How they remove the oxygen from the water and transfer it to their cells is called respiration. Freshwater contains only 5% of the oxygen present in air, while saltwater contains 20% less oxygen than freshwater. That subtle difference required adapting to how efficiently fish pump water over their gills.

Some of the books from our affiliate Amazon.com also explain it in greater detail.

Like us, the survivors adapted. It was another reason to evolve differently over the eons.

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