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The Common Goldfish is an elongated, flat-bodied variety of goldfish. The head is wide but short and its body tapers smoothly from its back and belly to the base of its caudal fin (tail fin). The caudal fin is forked. Its fins generally stand fully erect and the edge of the dorsal fin is slightly concave.The average goldfish lifespan is 10 – 15 years, though living 20 years or more is not uncommon in well-maintained goldfish aquariums and ponds.The environment the Common Goldfish is kept in is a determining factor on whether your pet will grow to its full potential size or remain somewhat smaller. In an average 15 gallon tank, if well cared for and not crowded, they can grow up to about 4 inches (10 cm). In a larger, uncrowded tank, they can grow generally reach about 7 or 8 inches (17.78 - 20.32 cm). If kept in a spacious pond, they can reach over 12 inches (30+ cm) with some hobbyists reporting their goldfish reaching up to a whopping 18" (45+ cm)!There are various solid colors and combinations of white, yellow, orange, red, brown, and black. The most distinguished specimen is a bright orange metallic color.The Common Goldfish is very similar to, and sometimes confused with, the . The Comet is a further development of the Common Goldfish. Both these fish have an almost identical body shape but the fins on the Comet are much longer, especially the caudal (tail) fin, which is more deeply forked. Also, the Comet is generally a reddish-orange while the Common Goldfish is more orangish. The adult size of the Comet Goldfish is smaller, too. On both these fish, the caudal (tail) fin is held fully erect.Also, in the standard orange color the Comet is generally a more reddish orange while the Common Goldfish is more orangish. The adult size of the Comet Goldfish is smaller too. On both these fish the caudal (tail) fin is held fully erect.Another goldfish that is almost identical to the Common Goldfish is the 'London' type of . Both these fish have virtually the same body and fin shapes, but the London type Shubunkin Goldfish has a totally different body color. While a good specimen of the Common Goldfish will have a bright orange metallic color, this London type Shubunkin goldfish can be speckled or have a variegated color pattern.

Freshwater fish are another of the most common types of pets The pictures of fish in the ..

Lastly, it is very difficult to find compatible fish to keep with oscars. They will eat any fish that they can get into their surprisingly large mouths, so you must keep them with similarly-sized fish. However, oscars can be very territorial and prefer to be left alone. They will beat up on other fish they view as competition, but they also can get picked on by the bigger and more aggressive members of the cichlid family. This means that you need a huge tank to house oscars with any other fish. Most beginners like to have more than one fish in their tank, but it is very difficult to do that with oscars.

What's the Most Popular Pet? - Live Science

The most common pathway by which exotic fish and wildlife species find their way into Florida's habitats is through escape or release by pet owners Fish can be amazing pets and will brighten up any room with their beautiful colors, but it can be quite stressful when they die and you can’t figure out why. Fish are infamously known to be short-lived pets, but they can live for longer than a few months if properly taken care of. If you’ve never had pet fish before or have never had luck keeping them alive, it’s important to know the most common reasons fish will die for the most success at keeping your new fish healthy and happy.

Best Types of Fish to Have as Pets - RantPets

Fish with disease can show a variety of signs. If you notice your pet fish having any unusual disease signs, contact your veterinarian for further advice. These are some of the most common signs of disease seen in pet fish:

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