Hundreds of thousands of years ago, long before the appearance on Earth of man, the oceans already swam fish. At that time they were the most highly developed creatures.
Since then, they began to develop a variety of ways so that now only some species only vaguely resemble the first primitive ocean fishes.
As a rule, fish has an elongated and tapering shape. People have copied it in the construction of ships and submarines, as it is the best adapted to movement in water.
Most fish use their tail as a motor. With the help of fins and they control their movements. Except for one species of fish, all the others breathe by means of gills. Fish swallows mouth water that passes through the gills and out through the hole. Water also contains oxygen, and it through the gills into the blood of fish, as the air through the lungs in the blood of man. Continue reading
Interested in your opinion – how to choose safe salmon, all adored the fish.
A few tips:
1. Do not buy fish with meat a bright pink color. Diet artificial fish defective, there is no shrimp and plankton, so the meat is pale.
2. Note the streaks in the Phil. If they are white, not bright pink, the dye was not used. If a fish’s little fins and red meat, so she was pumped full of dyes and growth stimulants.
Most often in fish stores buy pangasius and tilapia, because they are delicious and not very expensive. This fish brought to us from China and Vietnam – where its bred on small farms. So grown and salmon, Dorado, sea bass, sole, carp, pangasius, tilapia. Experts say that foreign products are not really fish. It can be compared to chicken-broiler. Artificial salmon are bred in special cages where the fish lives almost without movement, growth stimulants, give food with dyes, which give the meat a “dirty” color, and are pumped with antibiotics. Continue reading
Watching fish in an aquarium, you’d think they never rest or sleep. In the understanding of man, they are in constant motion. However, like all animals, fish periods of active behavior alternate with phases of slowing of physical functions – this is the dream fish.
Dream fish is different from our understanding of sleep. Structural features and habitat not allow the fish to fall into a state in which they would be completely disconnected from reality. In such a state is immersed most mammals during sleep. The fish also during sleep, the brain activity remains unchanged, – they are not able to fall into a state of deep sleep.
This feature and may cause the issue: how do aquarium fish sleep?
Studying the behavior of aquarium fish, you will notice that at certain times the fish are almost motionless, transfixed in the water. This is the sleeping fish. During sleep, the fish usually drift without active movement. But the slightest influence of external factors leads fish into an active state. Continue reading