Som is a major accesata fish that live in fresh water. Belongs to the family of catfish. This species is widely distributed in Europe. The habitat covers the majority of European countries except Spain, the UK, Italy, Norway. In the North the fish can be found in the southern water area in Sweden and Finland. In the South area of distribution reaches the coastal waters of the Black and Aegean seas. In Russia fish is spread up to the Urals. It is also found in Asia. The Aral sea basin. Members of the species and swim in the salty waters of the Black, Caspian and Baltic seas. The highest concentration observed at the mouths of large rivers and reservoirs. In the upper reaches of rivers is rare.
Body soma long. In front of it is rounded, and the rear part is compressed laterally. The head is broad and flat, eyes small and shifted to the frontal area. In the mouth has many small teeth. In the upper jaw are long whiskers one on each side. In the lower jaw there are 2 short whisker on each side. A long anal fin which reaches almost to the caudal fin. The dorsal fin is small, sharp and shifted towards the head. The pectoral fins are broad. Their fish creates a vortex in the water to disorient the victim. The skin is slippery and smooth. Scales out of it.
Body colour not monochrome. Back cantenna, almost black. The flanks are greenish-brown and diluted by lighter spots. The belly is light gray. It is more correct to call it off-white. In waters with flowing water the fish is lighter colored, and in stagnant waters it is much darker. Continue reading
In Zoological shop sells aquariums, varying in shape and size: rectangular, cylindrical, spherical. For keeping and breeding fish is considered to be a convenient rectangular all-glass aquarium. Many people make themselves decorative aquariums-pictures, aquariums-screens, etc.
To do this, take corner of sheet iron, glass, putty. Metal corner make a rectangular frame, insert the bottom and sides of glass. Then cover the cracks with special putty. Check the aquarium for leaks. Putty you can prepare yourself.
To do this, take two parts of dry sifted chalk, one part of red lead, mixed with hemp linseed oil to the consistency of thick putty, or 1 kg of drying oil oksol, heated to 60°C, adding 0.2 kg of bee wax, 2 kg red lead or gustotertoj paints. All components mix thoroughly and gradually add the chalk or tooth powder until the desired consistency. Set the aquarium on a well-lit area. If there is no such place, for artificial lighting, use fluorescent lamps or incandescent lamps. Lighting the aquarium should be from 8 to 21h. It is not recommended to set the aquarium on the windowsill, where frequently changing light conditions and temperature.
For aquarium maintenance preoperational:
— feeder fish;
— nets of various dimensions;
— a hose with a nozzle to remove the precipitate;
compressor; Continue reading
Over the past Millennium has developed this unique shape of the Black sea. This is the most fresh sea, with the lowest content of salt in sea water, the gentle sea-to-person around the globe!
The black sea is the most Northern subtropics in the world . the amazing beauty of the southern nature. It walks under the shade of palm and eucalyptus trees. It’s the heady aroma of blooming magnolias and meadow grasses. The Mediterranean sea brought the most modern inhabitants of the Black sea . The few remaining survivors of the disaster relict freshwater species, including the famous Azov-black sea sturgeon . took refuge in the river deltas of the black sea region .
The flora of the Black sea
The flora of the Black sea includes 270 species of multicellular green, brown, red benthic algae (Cystoseira, Phyllophora, zoster, kladofora, Ulva, enteromorpha, etc.).
In the composition of phytoplankton in the Black sea — not less than six hundred species. Among them, dinoflagellates — loricate flagellates (prorocentrum micans, ceratium furca, small scripsiella Scrippsiella trochoidea, etc.), dinoflagellates (dinophysis, protoperidinium, alexandrium), various diatoms, etc.
The fauna of the Blacksea
The fauna of the Black sea is markedly poorer than the Mediterranean sea . In the Black sea is home to 2.5 million species of animals (including 500 single-celled species, 160 species of vertebrates — fish, mammals, 500 species of crustaceans, 200 species of mollusks, and the rest — invertebrates of different species), for comparison, in the Mediterranean — about 9 thousand species. Continue reading