The content of fish – a favorite pastime of people of all ages and all sectors of society. It allows you to have Pets, even those who for various reasons – because of the lack of space, poor health, etc. – is unable to keep a dog or cat. Because in almost any home you can find a place for a small aquarium. On the other hand, for some, this activity can turn into a hobby that will certainly lead to changes in the life of an aquarist, manifested, for example, in buying a large show aquarium for the living room or multiple small aquariums for the fry, in the construction of a special “fish house” or the device of a large pond in the garden, or even all this together – depending on how far it will lead enthusiast his passion.
Aquarium fish are radically different from other common domestic animals in that they live in water and therefore can’t share our immediate environment. This means that you cannot take them on your hands and stroke it, or throw them a stick so they brought us back, or take them with you in a car trip. Continue reading
Jellyfish immobilize or even kill their prey (small planktonic animals, fish larvae) with the help of special stinging cells: in them is hidden a capsule of poison and United with it, sharp and jagged spear, rolled into a tight spring. The spring unbends, and poisoned spear pierces the victim’s body when she touches the sensitive hairs on the surface of the stinging cells – a kind of trigger, or the trigger of this weapon. In the victim’s body of a hollow sharp tip of the spear breaks off, and from it, as from the tube, poured a paralyzing poison. A stinging cell is a disposable weapon, once fired, it bursts and dies.
Planktonic crustaceans sufficient one blow poisonous Darts jellyfish or sea anemones to stop flutter. Now imagine how sensitive hairs touch you, many times pull the trigger when touching jellyfish in the water! Continue reading
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The fishery of sturgeon in the Black sea, the procedure for feeding and rearing of juvenile fish in the Ukrainian part of the Danube. The problem of the loss of major spawning areas due to dam construction, the ways out of the situation. The bioengineering reproduction of sturgeon.
Fishing is one of the oldest human occupations. Basic information about fish. Sturgeon breeding. Fisheries reclamation. A reduction in the numbers of sturgeon. Sturgeon adaptation to modern conditions of existence. Continue reading