The inhabitant of sea depths told the researchers about the secrets of immortality
The tiny freshwater polyp Hydra long been of great interest to scientists. In many respects it is connected with the fact that this animal is actually immortal and shows no…

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Aquarium fish catfish
This species belongs to the family of Armored catfish, Callichthyidae or Kalligrafie This family is included in the squad SOMO-shaped (Siluriformes). Members of the family — small fish that live…

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Mediterranean sea on the brink of ecological disaster
No one doubts that the Mediterranean sea is one of the most beautiful seas of our planet! Anyone who has ever been lucky enough to see the fabulous beauty 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.

The inspection found the cause of mass death of fish in the Nikolaev reservoirs
From 11 to 19 June this year, the State ecological inspection in the Nikolaev area repeatedly documented fish kills in the rivers the southern bug, Ingul and the Bugsky estuary.…

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A FAMILY OF PERCH
Schooling predatory fish. Body oblong, laterally compressed, dark green on the back, mother-of-pearl with visible brown-black vertical stripes on the sides (usually 8-10 pieces), light ventral. This famous painting of…

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