Cold Water Fish

There is a fairly widespread belief that It is easier to raise cold water fish, the fish warm or tropical waters. Nevertheless, It is not entirely true. Many tropical fish They are easier to maintain and the overall appearance of the aquarium will be cleaner, (in practice) to keep an aquarium goldfish. This does not mean that a tank of cold water can not appeal. If we talk about budget, so if we think a cold water aquarium is cheaper to launch, as it is not necessary to add water heaters, and buy cold water fish is not very expensive.

Cold water fish

The first ÀWhat fish can be considered cold water? The cold water fish are those They need a temperature between 10 ° C and 24 ° C to live, the temperatures being used on 20. Many of them can live perfectly outside, It is common to see them in ponds: carpas koi, goldifishâ € |peces that we can also be found in cold water aquariums.

Types of cold water fish aquarium

Over the years, aquarists have selected a number of copies of cold water fish, perfectly fit to live in an aquarium. These fish have in common, what need temperatures not exceeding 20 ° to 24 ° C to live. Some are ideal for small aquariums, while others will need a large aquarium or a pond directly.

exotic coldwater fish, small aquarium

Here is a selection of cold water fish which can be added a small aquarium. Not everyone can share space, because some of them can be territorial, or have a different habitat needs.

Goldfish, Red fish (Carassius auratus)

  • Scientific name: Carassius auratus, Cyprinus auratus
  • Common name: Red fish, Goldfish, crucian carp gold, fish kite
  • Size of the aquarium: a hundred and fifty a 200 liters
  • Temperament: Quiet
  • Temperature: Between 16 ° and 20 ° C
  • pH: Between 7
  • Diet: Omnivoros
  • Length: Until 35 cms
  • File: Goldfish

El Goldfish is the typical red fish in fishbowls we've seen for years. Actually having it in a fishbowl is pretty cruel, the space is insufficient. Its origin is in Asia and is highly related to the tents, since both are ciprínidos. The most popular are red fish, Nevertheless, on the market there are hundreds of mutations of all kinds, from thousands of crosses, that they have generated different species considered commercially, although all Goldfish. The big advantage is that not grow as much as tents, the maximum aquarium are usually measured in a 35 centimeters, They are very sociable and can share space with other species. A very colorful alternative to traditional red fish is the telescope fish, a variety obtained from natural selection of copies:

fish Telescope

  • Scientific name: Carassius auratus
  • Common name: fish Telescope, fish Ojones, Demekin, Dragon Eye Goldifish
  • Size of the aquarium: 200 liters
  • Temperament: Quiet
  • Temperature: Between 18 ° and 22 ° C
  • pH: Between 6 Y 8
  • Diet: Omnivoros
  • Length: Until 20 cms
  • File: fish telescope

The Pez Telescope Goldfish is a mutation. Among the many that exist, one of the nicest and marketed, It is the fish Telescope, also called Demekin. What it makes it especially morphological variations are authentic, with eyes protruding from his head like a swollen balloons, so also is nicknamed Ojones. curiously, They have a terrible vision, and they are not good at competing for food. From there, They have generated a lot of other mutations, with colors ranging from the typical gold, to the black (one of the defendants), blue, chocolate, White, even with various colors. Its origin is speculated that may be in China, where He was known as Dragon Eye Goldfish or Dragonfish.


  • Scientific name: Carassius auratus
  • Common name: Pez shubunkin, fish comet, Goldfish arlequín
  • Size of the aquarium: one hundred fifty a 200 liters
  • Temperament: Quiet
  • Temperature: 16ºC a 20ºC
  • pH: 7
  • Diet: omnivores
  • Length: Between 15 Y 30 centimeters
  • File: Shubunkin

The Shubunkin is another variety of Goldfish, which it is particularly attractive for its color. The result of the selection and the numerous crosses made, this is a fish with a bluish background color, blotchy black and red, among which we can find other colors, as yellow. In the market there are some varieties for sale, but they not all are easy to find. They are very suitable for keeping fish in pond, as perfectly they endure very low temperatures, and all conditions of water quality. This does not mean we have to let up in their care, simply that at certain times they can withstand the parameters and quality of water is not optimal.

Rasbora Galaxy

  • Scientific name: Denmark margaritatus, Celestichthys above margaritatus
  • Common name: Rasbora Galaxy, Microrasbora Galaxy, Celestial Pearl Danio
  • Size of the aquarium: Minimum 30 liters
  • Temperament: Quiet
  • Temperature: Between 22 ° and 28 ° C
  • pH: Between 6 Y 7.5
  • Diet: Omnivoros
  • Length: Between 1 Y 1,5 centimeters
  • File: Rasbora Galaxy

The Galaxy Rasbora is a fish that is the temperature limit to be considered a cold water fish. If you are sharing space with other copies of cold water, we must consider that their basic needs are met. The great advantage of the Danio Margaritatus is its size, what fails to pass the 1.5 centimeters, so you can have a small shoal in the aquarium (it is advisable to have the least 10 copies), Pure achieving a much more effect when few different copies. As for its appeal it is undeniable. It is a fish prized for its blue metallic coloration, covered with white spots or yellow, giving rise to its name, as it seems covered with stars, as a galaxy.

Paradise fish

  • Scientific name: Macropodus opercularis
  • Common name: Paradise fish
  • Size of the aquarium: eighty litros
  • Temperament: Aggressive
  • Temperature: Between 10 ° and 22 ° C
  • pH: Between 6 Y 8
  • Diet: omnivorous
  • Length: 10 ctms.
  • File: paradise fish

The Paradise Fish is an excellent fish for aquariums cold sweet, as reaches to withstand temperatures near 0. Not to go home to go to such extremes, but it is an example for you to understand the resilience of this fish. Although sole name not much in the pools for cold water aquarium, it is the first ornamental fish imported into Europe. Perhaps not usually introduce much in aquariums, why It is not the best tenant for a community tank, since it is somewhat aggressive and territorial. At the same as the Marquees, Its origin is in Asia, in areas of Vietnan and China. It is an omnivorous fish and good appetite, will eat dry without food problems, we must supplement with insects and larvae.

Neon Fish Chinese

  • Scientific name: tanichthys albonubes
  • Common name: neon Chinese
  • Size of the aquarium: forty litros
  • Temperament: Quiet
  • Temperature: Between 18 and 22º
  • pH: Between 6 Y 8,5
  • Diet: omnivorous
  • Length: From 4 a 6 centimeters
  • File: neon Chinese

The Neon Fish Chinese, known as fish of the White Cloud Mountain, It is a fish in aquariums recurring cold water, because it is very easy to care for and also has a bold, bright colors: greenish brown body, crossed longitudinally by a yellow line, and topped with fins yellow coloration and red. They are rather small fish (oven between them 6 centimeters), compared with other cold water fish aquarium, as carp or goldfish. It is best for a small aquarium, you do not need much maintenance. It is a very sociable and gregarious copy, what like to live in small groups of eight to 10 copies, where he will share space without any problems, with other fish that can withstand temperatures between 18ºC and 22ºC. A special feature of this fish is that it likes to jump. While the aquarium should cover, to avoid any unwanted accident.

Large cold water fish, for aquariums large format

Some cold-water fish can not live in a traditional aquarium, They need an aquarium large format. They are cold water fish large, they will not thrive in an aquarium 200 liters, usually they will need a cold water tank much larger:

Pez Koi Carp

  • Scientific name: Cyprinus Carpio
  • Common name: Carp, Pez Koi, Koi Carp
  • Size of the aquarium: 200 liters
  • Temperament: Quiet
  • Temperature: Between 17º and 24ºC
  • pH: Between 6.8 y eight.5
  • Diet: Omnivoros
  • Length: Until 90 cms
  • File: Carp

The Koi Carp It is one of the most common fish in the world, and one of the regulars in ponds and cold water aquariums, since it is possible her calf outdoors. It is directly related to the common carp, because in reality this is a species whose origin is the intersection of different carps, until which today is known as Koi carp. Although the origin of Koi carp breeding is in China, It is Japan that we popularity around the world. The problem we have with tents aquarium, It is the large size that can reach. It is not easy in an aquarium are fully developed, but in theory they could reach up to two meters, even if it is logical that maximum stay on 75 centimeters. Because of its great voracity, it is not easy to live with other fish, since they can serve as food. Son omnivorous: They eat invertebrates, began, crustaceans, other fish, began, plantasâ € |comprenderás that are very easy to care, since they can offer prepared foods, supplementing your diet with all kinds of vegetables from home, like lettuce, € guisantesâ |.


  • Scientific name: Lepomis gibbosus
  • Common name: Percasol, miss Sun, sunfish, Pumpkin fish
  • Size of the aquarium: 200 liters
  • Temperament: peaceful. Territorial in breeding season
  • Temperature: 4º a 22º
  • pH: 7 a 7.5
  • Diet: Carnivorous
  • Length: 10 a 20 centimeters
  • File: Percasol

Although pond or an aquarium is difficult to get to spend the 20 centimeters, these wild fish can measure 40 centimeters. They are not suitable fish to share space with other smaller, as They are basically carnivores and any small specimen is part of your diet. If we're going to get into an aquarium, have a less 200 hereinafter liters. It should be well covered with vegetation, which it is the habitat where they are comfortable. As for the quality of water are surviving fish, They are able to live in conditions of very poor water calidadâ € |obviously it not is going to be the situation that we are going to provide, but it gives a thought resistance of this variety of cold water fish.


  • Scientific name: Lepisosteus eyewitness
  • Common name: Pejelagarto, Pejelagarto ocellated, Pejelagarto painted, Catan pinto, Catan painted, Pez alligator
  • Size of the aquarium: 600 a 1000 liters
  • Temperament: peaceful
  • Temperature: 12ºC a 20ºC
  • pH: 5 a 7,5
  • Diet: Carnivorous
  • Length: a hundred twenty five centímetros
  • File: Pejelagarto

the pejelagarto It is unique, with origins in prehistory of humanity, it certainly is a survivor. Has an elongated body in which almost no difference between the body, his head and his mouth. Precisely his mouth, filled with some threatening conical teeth, They provide you the nickname alligator fish. There is a fish that can live with small fish, because as with species such, They are part of your diet. Nevertheless, It is a fish sociableâ € |siempre not be part of your dinner.

Requirements to set up a tank of cold water

Set up a tank of cold water It does not differ too much from riding any other aquarium, but it should review what elements are essential for fish are in perfect condition:

  • Filter. Filters are an essential element in any aquarium. Thanks to the filters maintain water quality under control: uncontrolled increased nitrite / nitrate, It may be dangerous for fish life. Depending on the size of the aquarium, the quantity and variety of fish, the filter has to be able to debug minimal liters.
  • illumination. You should not neglect the aquarium lighting, which should be appropriate to the species living in the aquarium. Aquarium lights are not a mere ornament, They have much to do with life inside the tank, especially if you also add plantasâ € |imprescindibles fish in a fish aquarium cold water, not only because emulate their environment of origin, also they contribute to the filtering process.
  • Heater O fan aquarium. While we are dealing with cold-water fish, that most of the time will not need heating € |también it will depend on the ambient temperature of your house. Analyzes if you need a heater or cooler € |o maybe two. It is important that the water temperature is correct.
  • Aquarium Plants. Plants are another necessary element, I would say essential in the aquarium, although the need to include them or not depends on the variety of fish that will occupy the aquarium. Some fish eat the soft leaves, other unearth the plantasâ € |tienes plants that adapt to any circumstance, just pick.
  • Substratum. The substrate is necessary both to plants, to pecesâ € |aunque much more for the first. Fish can be perfect with an inert substrate, the basis of the records enviornment, but to grow plants is necessary that the substrate will supply nutrients and sustenance to the roots.
  • Aquarium fish. By last, choose the fish that will form part of the aquarium. You must be careful to have made previously the Cycled aquarium, for water conditions are correct.
  • Check that the species chosen are compatible. Check sharing parameters similar water, temperatures, the aquarium is adequate, They can live in a similar habitat, and many others. Please, no goals tropical fish with cold water fish, and also Do not fall into overpopulation. You do not need 10 different species of fish to the aquarium is well.

    How to care for cold water fish

    Cold water fish aquarium, They are easy to maintain in water at room temperature, bearing fluctuations in the temperature of the water where they live. It is the biggest difference between tropical fish, they need aquarium in which to reproduce the conditions of temperature of their hometowns. In general terms Cold water fish are very hardy. You certainly know more than a pond they live in tents throughout the year, supporting very low temperatures. It will not be in any case an aquarium inside the house, but we used to illustrate the strength of these fish. follow these tips, to build your aquarium cold water without problems:

    • Before introducing different species in a community aquarium, GB: Make sure it is suitable compatibility between them. If you have any doubt, consultation with the seller Store.
    • All you time monitor the health of the copies of the aquarium. A fish that shows distant and not involved with the rest, a fish that changes shade or a fish that is attacked by the rest, for no apparent reason, It is a sick fish. It is desirable to isolate, to discover that happens. Consult an expert to treat any disease.
    • Within the Goldfish I have shown how the Pez Telescope has trouble seeing, what causes trouble competing for food. This problem is not unique to this fish. If you know that a fish has specific needs, monitors that are served, to avoid creating a bigger problem.

    Food for cold water fish

    We have spoken so far of the needs of the aquarium, so that cold water fish are perfect. We also have determined which species are the most appropriate, depending on the size of the aquarium. One point that we should not forget is the feeding of fish, about the resides much of the success in the health of aquarium fish. A diet inadequate or incomplete, will cause ill. These are foods that can provide cold water fish:

    • dry food. Dry food for cold water fish are available in all formats: flakes, sticks, granules (best suited for automatic dispensers)â € | The variety is wide. Manufacturers have designed very complete food, that can be used as single feed, or as a supplement to other foods based live.
    • live food. artemia, worms, tubifex, daphniaâ € |lo easier to get is the Artemia, from which we can make a single farm house.
    • Frozen food. All previous bugs, but frozen for storage.
    • fresh food. Many fish need to supplement their diet with fresh food, among which we will include peas, all kinds of lettuce and leafy greens.

    It is important to have under management how much food we give them, as resulting excess food in more dirt from the aquarium, decomposition and increase nitrites. Al remaining we can descontrolar the parameters of the aquarium, so it is suitable only feed them the food they are able to eat in a few minutes.

    Source of cold water fish

    Cold water fish come from climates colder than hot water (obvious), in most cases they come from Europe, United States and North China. They are fish that survive well in waters with temperatures not exceeding 15 °, and in some copies as the tents can be enjoyed on the outdoor ponds, withstanding temperatures of 10º. Perhaps the best example of cold water aquariums is el Goldfish, the variety of fish aquarium cold water that takes breeding in China for more than 2.500 years. A fish that has been bred for so long, It has resulted in a selective breeding fish origin with different shapes, colors and fins.

    Considerations aquarium fish cold water

    A previous question that needs to be done, before choosing cold water fish for our aquarium, it is Size will have as adults. Fish that we can be found in pet shops, They are babies and seemingly small. Some varieties grow enough and is convenient to have an aquarium adapted to their size. It may happen that the aquarium does not fit the size of the fish chosen, in these cases the fish tend to have poor growth and health, while those who do not adapt well, die from stress. The goldfish eat and excrete enough with the same forcefulness. This detail about their diet and lifestyle habits, It requires choosing a suitable filtration system. Another aspect is to evaluate the lighting, which must be balanced to avoid the appearance of algae in an uncontrolled manner. In tropical fish aquariums with hot water, this aspect is solved to the variety that include some algae feed, but it's not easy when we talk about cold water fish. Plants that can or should be included in a coldwater aquarium, They have to be very resistant. Sometimes golden fish usually eat the leaves, so you have to choose species that are resistant and can grow in low light.

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