How fish care for their young
Fish reproduce by laying eggs, from which soon there are young fish. The number of eggs, put in various kinds of fish, are very different: from several units up to 300 million!
The eggs also differ in shape: they are usually spherical, but cylindrical, and even in the form of droplets and cigars.
Most of the fish does not care about offspring, and even parents often eat their own eggs and fry! However, many types of fish (usually males) still care about their kids.
For example, the fish-needle and seahorse males born females are carrying eggs, Prilepin it on your belly, or in special pockets and the folds of the skin. And the male stickleback is a very caring dad. He first builds the nest by sticking pieces of grass. When the females will lay their eggs there, keenly watchful father protects him, and even “air”, pumping clean water by movements of the fins. When the eggs appear young fish, Papa stickleback for several days ensures that they are placed in the nest, and returns to stick in there kids, capturing their mouth.
In General, however, fish often build nests. The trout and salmon lay eggs in the excavated pit and covered it with sand. Some bullheads and catfish do NESDIS stones and bits of plants.
The way of life of the fish is generally closely associated with their usual “place of residence”. For example, a catfish living in muddy river backwaters and ponds, trout — only in clean running water, the gudgeon is on the sandy bottom. However, there are fish for spawning are going on a long journey. For example, the salmon spawns closer to the sources of the rivers. No fast current, no network, no dams, and even waterfalls of significant size can’t stop their progress. Overcoming obstacles, salmon can jump out of the water at 2-3 m in height! Got to the target, the female prepares the nest becomes almost vertically and drills the bottom of the tail, and the resulting hole already lays eggs. Appeared after 4 months of the youth sailing down the river and out to sea for “feeding”. Adult fish return again up the same river to spawn. Salmon easily recognize where in the river he was born, because each river has its own unique taste.
Even more tireless travellers are river eels. Lay eggs they go in the distant Sargasso sea, while crossing the Atlantic ocean. Their fry back to Europe by the warm Gulf stream, growing up on the road. Grown eels off the coast of the Motherland are sent up the rivers. Having become quite Mature after only 12 years, they once again go on a journey to spawn.
Fish with amazing shape, well, flounder. The body of this shark is flattened sides in the form of cakes, and it usually lies buried in the sand or mud so that can only see their eyes. Noticing the prey, flounder in one motion shake off the sand and seizes unwary victim. After that fish again falls to the bottom, vzbalmoshnaya water, and immediately covered with a smooth layer of deposited sand or silt. Flounder has the amazing ability to change color to match the environment. Even if you put a chess Board, it in 3-4 minutes will be plaid! Great arranged flounders and eyes: not only can they move independently from one another, but also can fold and retract as needed. Surprisingly, at an early age the eyes of this fish are sitting correctly, one on each side of the head. Then, as they grow, one eye moves to the other side, whereby the side facing to the bottom, left without eyes.
Different from other fish because of its shape and the fish-needle. This tiny fish lives in shallow depths where the bottom is overgrown with many plants, and can reach a length of 60 cm.
And seahorse do not like fish, it is more like a marine animal. Sea horse also inhabits the sea bottom covered with plants, attaching their rings zabitym tail to algae.
Among marine fish all over Europe recognize the poisonous sea dragon, or Scorpion, which can reach 36 cm in length. The body of this fish is compressed laterally, and the eyes are set high and look up, because he lives in a sea dragon at the bottom and often burrows into the soil so that only the head is visible. If you accidentally step on it bare foot or to grab a hand, the sea dragon looks at the “offender” sharp poisonous barb. Its poison is very strong, so in most severe cases can lead to death.
In the Black and Azov seas is also common small Scorpion, or marine fish. This fish loves a rocky bottom, and is reminiscent of a stone growing on it algae. Injections of poisonous spines in its fins, very painful.
The sting ray or sea cat are also poisonous, some specimens can reach a length of 2.5 m. Its diamond-shaped body ends in a long thin tail on the end which has sharp serrated poisonous spine. If you step on has buried in the sand of the ramp, he inflicts a deep wound with their weapons. His shot resembles a shot with a blunt knife, the wound heals very long, and in some cases can even lead to death from cardiac arrest.