The structure of the pharynx is also closely linked to feeding habits of fish. As indicated, the number and structure of Gill rakers may be very different — from a few small hard bumps predatory fish to a complex network of frequent rakers in silver carp — Hypophthalmichthys molitrix (Val.), litumelo planktonic algae. The mullets — Mugili – dae — muscular throat adapted for crushing lisovogo clump, consisting of detritus and vegetation. Some fish developed teeth on the pharyngeal bones. Some they are on top – and ninepatch bones, as, for example, wrasses — Labridae, or only ninepatch, as, for example, cyprinids — Cyprinidae.
Haeckel (1843) divides nizhnelomovskie teeth of cyprinid by the nature of the structure related to their function into four types:
1) hollowed — excavati, a type of Longhorn beetle,
2) chewing — mastic torii, a type of carp, Continue reading
A cruise in the Mediterranean sea is very popular with tourists. This is an opportunity to visit several countries in one vacation. Here are some interesting facts about the Mediterranean sea:
The very name of this inland sea comes from the Latin Mare Mediterranea — sea in the midst of the Earth. This term was coined by the ancient Greek writer Julius Solin.
Modern computer technology has helped scientists to calculate that the filling of the Mediterranean sea occurred due to the catastrophic floods that occurred 5.3 million years ago. It is noteworthy that it was filled for two years. The article describing this research, published in the journal Nature, New Scientist gave a brief retelling.
Tectonic activity of this region caused the formation of a wall in place of Gibraltar. She was blocking the ocean from the sea that turned into a lake. Previously thought that the isthmus had a very powerful waterfall, which was considerably higher than Niagara, he filled the sea for about 10 years. Continue reading
Clean water is essential for the biological balance in the garden pond. Water quality has a direct impact on the growth and reproduction of plants, the growth of microorganisms and fish health. The water should contain all the necessary elements that are important for the proper flow of biological and chemical processes. If all the indicators are normal, and livelihoods at the micro-level optimal, then Your garden pond is established biological balance. For many, garden ponds, where, as a rule, the ratio of fish to water volume is very large, beautiful and successful solution is to install the filter. In the garden pond is one fish about four times less water compared to the reservoir in wildlife. The natural balance is disturbed quickly also because of the waste products of the inhabitants of the lake. This is especially true for koi. On the one hand, the water in the pond through the filter is maintained in a clean condition, and, on the other hand, the filter will take care of proper water circulation, which in turn will provide additional supply of the required amount of oxygen. Pressure filter provides both mechanical and biological treatment. Continue reading