Mackerel is a common and very important fish for the fishery. It is small, silver with a dark back and a barbed bone nail file along the sideline. Mackerel overwinter in the deep, going in large schools, spawn all summer. To the shore suitable only at the end of October, because they prefer cool water.
Mullet – the most unpretentious of our commercial fish. Spawns in the coastal zone to a depth of 75 meters, however, can proliferate in the open sea. Withstands water temperatures from 0.5 to 38°C, salinity to 80 g per liter, but lives in polyprenol water. Tolerate the lack of oxygen in the open sea swims, even in the deeper layers with “rotten water” and hydrogen sulfide bacteria. Mullet indifferent to polluted water and often winters in the ports under jetty. Its meat, unfortunately, begins to smell of fuel oil.
Fish-bed boppers – master to change the colour and even the patterns of his skin, repeating pattern and color of the soil. Floating over a familiar bottom, flounder disguises itself in just a few seconds. To select a color for the new background, take a lot more time, however, expanding and compressing the special pigment cells on their side, it can adapt even to the chessboard. Continue reading
On the question about the number of teeth of a white shark cannot be answered unequivocally because they are located in several rows. Their number is variable, and depends on the size of the animal, its age. Some time back the tooth is in the gum, taking a vertical position only when the free space because, unlike the teeth of mammals, they do not have long roots and they are able to move about freely in the gums. Upper teeth, by the way, arranged in one row and larger than the lower. But the lower teeth are more acute.
The modern great white shark teeth have a triangular shape and as sharp as blades. Such teeth easily cut through large pieces of meat with large fish or mammals, or to bite prey in half. The porbeagle teeth tone, acute and recurved for grasping and retaining a nimble and slippery prey. In benthic species, feeding on molluscs and crabs, the teeth are thick and blunt – these tools comfortable to chew solid calcareous shell and the shell. The teeth are in the mouth and in the throat of many series – one thousand and even more. Working teeth are in the front row. They easily fall off, and his successor shall be nominated from the depths of the jaws of the all-new series is a real “factory tooth”. Continue reading
This article is about the tank for keeping aquatic organisms.
Aquarium (lat. aquarium ) — artificially formed aquatic habitats in a transparent tank designed for the maintenance of organisms-hydrobionts (animals and plants).
It typically refers to a home aquarium (room) aquarium for keeping fish aquarium in home; for technical reasons, the maximum volume of such a tank is usually less than one cubic meter. Public aquariums . intended for demonstration to the audience of aquatic flora and fauna existing in the structure of zoos or as separate spectacular educational institutions can exceed 3000 m3 in volume. The world’s largest capacity for the housing of inhabitants of sea is in the amusement Park Chime-Long Ocean Kingdom in China’s Zhuhai. According to the Guinness Book of records. it is the volume of 22.7 million liters (22,7 thousand m3). This aquarium also has the largest square panels of Plexiglas (39,6 x 8.3 m) and that has no analogues in the world, underwater hall with a diameter of 12 m  .
To maintain the biological balance in the aquarium used a variety of tools: aerators, mechanical and biological filters. thermostats. thermometers and much more. Description simulation of the ecosystem in a closed artificial vodoeme various aspects of breeding fish deals aquarium . Continue reading