How many teeth does a shark?
The shark is one of the most amazing animals, but the shark is one of the most dangerous predators of the water world. Sharks have a very interesting feature related…

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The truth about modern fish. Explain why cheap fish better.
Pros: tasty, inexpensive, very useful Someone in my family loves fish. I have therefore tried many kinds of fish and ways of cooking. And in this case, the issue price…

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View aquarium fish: goldfish
At present, there are dozens of varieties of goldfish. The most similar to silver carp goldfish common. Different from carp, mainly for its yellow-gold color. One of the varieties of…

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The species of fish.

Since the fish bred in aquariums generations, there was a clear tendency to choose the most colorful animals for breeding. So many of the most popular tropical aquarium fish kept today, have more vivid coloration than their wild forms. Modern methods helped to selekcioniruut varieties from original wild forms taken from natural habitat, to new forms, genetically-modified breed, and available for every aquarist.

The science of genetics, explores the possibility that species characteristics pass from one generation to the next. The characteristics of all living organisms, including fish, are contained in genes, which are rod-shaped structures called chromosomes, present in the nucleus of every living cell in the body. Mutations, or sudden changes in genetic structure can occur, and sometimes result in a change in the appearance of fish, such as coloration, body shape and fins. When there is a mutation in certain cells eggs or milk, the change is transmitted to the next generation. Most mutations are only carried out minor changes that can be improved by selective breeding over many generations. In some cases, there may be a mutation that creates a radical change. Yellow Gold angelfish (Pterophyllum sp. var.), resulted from mutations that caused poteryannogo of pigment that normally masks the yellow tint. Mutations can also be harmful, it stands out, in very many groups of fish, where you might get a few deformed individuals.

Genetic modification of fish.

Selection and crossbreeding.

Photo: After the successful varieties, such as this Black Variegated Delta Guppy ( Poecilia reticulata ), it was found that the best parents are selected for each pairing of the future, to ensure that the strain is maintained and improved.

Hybrids.

Under normal circumstances, individuals of separate species, breed with individuals of the same species. Sometimes it is possible, to provoke individuals from two different species to mate, creating offspring with new characteristics. This method to create new types of aquarium fish controversial because these fish have never existed in the wild. Crossbreeding is widely used to create various forms of popular viviparous, including the famous Black Mollies, gourami hybrids the most colorful and exciting with the Parrot cichlid.

Aquarium fish
When it comes to buying a pet, people often forget about aquarium fish. And for good reason, because it's a very aesthetic animals can teach responsibility because they require a…

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Fish of the Black sea
Katran - black (Squalus acanthias ponticus) Reaches a body length of 2 m (usually 1.5 m). Found only in the Black sea waters to depths of 60 m. Attention. All…

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