Ponds and reservoirs
Water is an essential element of the garden, decorated in any style. That's the water surface of the pond, a bubbling stream of a brook or the noise of a…

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Aquarium fish
Fish is one of the ancient groups of vertebrates living on Earth over 300 million years. They now inhabit most waters of the globe, despite the different conditions of existence…

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nature

The structure of the pharynx, the feeding of fish.

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

Interesting facts about the Mediterranean sea

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