We all know that water is life. Without water can’t live no living creature. And the first life originated in water. Fish one of the many live organisms living in the aquatic environment. They live in the oceans and seas, rivers and lakes. You can see them in the pond and the stream, in the waters of caves and even in puddles. In nature, there are over 25,000 species of fish, and they are divided into two classes: Bony fish (more than 23 000 species); Cartilaginous fishes (9000 species).
To the class of cartilaginous fish include sharks, rays and chimeras. To the class of bony fish include salmon. okuneobraznyh. preobrazenie. clupeiformes. Cypriniformes, catfishes, wildcookie, flatfish, coloscopie.
Fish are cold blooded vertebrates. their streamlined body covered with scales. They breathe with gills, and with the help of fins and tail to swim. Water entering the body through the mouth, passes through the gills, and spilling over her holes. Oxygen enters the bloodstream of fish through the thin membrane of the gills. Do fish have paired fins (pectoral and abdominal), which are located on the sides and unpaired, located on the median vertical plane of the body (back, tail, and anal). Fins help fish to steer, brake, accelerate and keep the balance. Continue reading
The conditions of human life in the metropolis is very far from its natural habitat. Stress, nervosa, depression are an integral part of residents ‘ life. But what else to expect from things like traffic jams, crowding in the subway, outdoor advertising aggressively and journalists hyping crap up to the global crisis? Look from behind the curtained window of the apartment building onto the street. If you pushed the shutter, so here is another apartment building, “seashells”, the cars in the yard and rubbish bins.
The aquarium is primarily beautiful. Many believe that it is also unnecessary waste of resources, and a lot of hassle. But this is not always the case.
Use aquariums not only that they are pleasing to the eye. For example, in the office aquarium will accentuate the individuality of the owner, will show that taking care of living beings alien to him. Moreover, in the middle of a hard day contemplation peacefully floating fish helps you relax. Doctors say that looking at the inhabitants of the aquarium helps to normalize blood pressure. Continue reading
Almost all members of the family of catfish unpretentious, so they are recommended even for beginner aquarists. But still some features to care for them.
In a group of catfish includes more than 200 species of fish, but in the aquarium you can hold not all members of this family. This is due to the physiological characteristics of individual species.
Some catfish in adulthood reach an impressive size, so they begin to pose a danger to small inhabitants of the aquarium. In addition, there are breeds which differ quite aggressive in nature, so they too are not suitable for keeping with other fish.
Popular species of catfish
Of course, you can only breed catfish, but the majority of aquarists prefer to choose peaceful members of this large family that they get along with other Pets.
The most popular species suitable for aquarium rearing are: Continue reading