Today our article will be about a very ancient creatures of the animal world that lived before dinosaurs and sharks. So there you go.
• At the moment the science there are about 350 species of sharks, but scientists believe that there are unexplored species.
• The size of sharks vary greatly. The smallest known shark is the dwarf shark glowing. It has a size
no more human hands. The greatest number of sharks include a large whale it often exceeds 10 meters in length. There are reports of specimens 18 and 20 meters. Despite their enormous size, they feed only on plankton and small crustaceans.
• The shark is a fish, moreover it has no bones in his body. The entire skeleton of sharks consists of cartilage.
• In order to breathe, a shark must constantly swim. Continue reading
I was introduced to reader’s letter “Change” V. Karataeva from Voronezh. He writes to the editor: “. In the fall I was vacationing on the black sea coast. Ya big fan of fishing, made friends there with an old fisherman. Once he told me, among other things, that in the Black sea were the whales. But he no details about it does not know. After returning home, I mentioned this fact to my friends in the shop, and I was scoffed at. I ask the editors to help me figure out if there was an old fisherman.”
I remembered that I had read something similar in one of the old magazines.
Indeed, reviewing the magazine “Nature and hunting”, who edited a well-known ichthyologist L. P. Sabaneyev, I found in the may book for 1880 the note, “the Capture of a whale in the Black sea”.
Here are some quotes from it: “In “Novorossiysk Telegraph” reported from Batum the following details of the capture of a whale in the Black sea. Continue reading
There are a huge number of varieties of aquarium fish, each of which has individual qualities and appearance.
Aquarium fish are completely different shapes, sizes and colors.
Choosing fish for your aquarium, you need a balanced and reasonable approach to this procedure. The first thing to consider the compatibility of the fish and size of aquarium. Is that some sort of fish grow larger than their neighbors and just eat them.
Different types of aquarium fish prefer to dwell in different water layers, some prefer is always at the bottom, some in the middle layers, and at the surface. So, if you want your aquarium to be balanced and everywhere were its inhabitants, it is necessary when selecting the fish to take into account this fact.
Types of aquarium fish
There are two main types of aquarium fish is viviparous and ikromechuschie. Viviparous fish giving birth in the form of small shaped fish. Continue reading