Directory of commercial fish

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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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…

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Why should eat sea fish
Has long been reported that the dishes from sea fish should be on our table at least twice a week. Substances contained in fish, are needed to strengthen the skeletal…

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Amazon com the Arkhangelsk province

Fishermen in the Arkhangelsk region took out a strange catch in the area of ferry crossing Bereznik and aspen: they pulled from the water an unusual fish with the head of a turtle and fossilized scales.

According to the newspaper “Dinovite”, the fish has a head like a Brontosaurus, and also a large barbed needles and petrified of the scales. Its mouth looks like a suction Cup, similar to the mouth of sturgeon. The fishermen studied the various pictures on the Internet, but found no mention of such unusual instances. However, similar features are observed in fish such as sea hare and monkfish.

Later, the fish was identified, it became clear that this brocade pterygoplichthys, or armored catfish. He eats algae, and it plant aquarists. The habitat of this catfish – the water of the Amazon and Orinoco.

Recently anglers and ichthyologists meet more and more exotic species in the rivers of the middle zone of our country. In 2012, about catching the same armored catfish reported in the press Penza: Continue reading

Striped Marlin.

Tetrapturus audax (Latin), Striped Marlin (eng), Red marlin (Japan)

Distributed in tropical and warm temperate waters of Indian and Pacific oceans.
Striped Marlin is pelagic fish and performs seasonal migrations, moving toward the equator in the cold season and back in the warm season.

A distinctive feature of the striped Marlin is the high dorsal fin equal to the height of the fish’s body. The pectoral fins are easy to fold up and pressed close. The body is strongly flattened laterally.

Back striped Marlin silvery-blue, sides silvery with a blue tint, and white belly. On the sides of the horizontal blue stripes, which persist after the death of the fish that distinguishes a striped Marlin from his fellow species. Continue reading

How to make a pond for fish farming

There are many ways to create a pond to breed fish at home – as difficult, requiring a lot of physical and material costs, and simple and cheap.

Before you can create a pond for breeding fish, you should become familiar with the basic requirements to create an artificial pond.

Manual

1 the Pond should not be in the shade of trees or buildings, so it can be illuminated by the sun at least part of the day. It is best to create it among the flower beds and close to home. And if the choice of the shape of the reservoir can fully rely on imagination, the depth of the reservoir depends on its purpose. For example, hoping to leave the fish in the pond for the winter, need to build special wintering pits or wells. Continue reading

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. In this regard, we selected 22 samples of water and held control for the major pollutants.

As reported in a press-state ecoinspection service in the Nikolaev area, in the surface layer recorded water dissolved oxygen for the entire period from 0.9 to 10.5 mg/DM 3. The ratio — during the summer, the oxygen content in all water bodies should be not less than 6,0 mg/dm3 .

The oxygen is released into the water column as a result of processes of photosynthesis, which better takes place in the daytime. At night there is a reverse process. Therefore, the minimum content of oxygen is observed at dawn, which was recorded on June 19, in 6 hours (the water temperature was 25 0 C). The concentration of dissolved oxygen ranged from 4.0 mg/DM 3 the water surface to 0.2 mg/dm3 in the bottom horizon. This fact is due to the hydrometeorological conditions prevailing in the present time, what is the likely cause of the phenomena zamorny. Continue reading

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 signs of aging.

From a biological point of view, an unusual phenomenon is explained by the fact that Hydra reproduce by budding and possess impressive abilities to regenerate all areas of the body due to the presence of a large number of stem cells. With age, the number of “miraculous” cells is not reduced, and they continue to renew the tissues of the body.

German researchers from the University named after Christian Albrecht (Christian-Albrechts-Universität zu Kiel) decided to find out what are the genetic basis of immortality of Hydra, and was surprised to find that the secret lies in the gene FoxO.

It is well known to geneticists, as there is in all animals and humans. Biologists have also proven that it is associated with aging. However, its role still remained unclear. Continue reading

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