This is an unusual video about the invasion of Asian silver carp caught on Wabash river (Wabash River) in the Midwest, mark Kirby (Mark Kirby) and his partner Brendan Kearns (Kearns Brendan). According to specialists, the most famous lake in the USA and Canada are on the verge of this ecological disaster. Silver carp, imported once from Kazakhstan (behind the ocean it is called Asian carp), has spread to the waterways of the New world with an incredible scale.
It all started with the fact that in 70-e years of the last century of American fishermen, not thinking about the consequences, brought a few specimens of silver carp and silver carp, which were caught in lake Balkhash to “imported” fish destroyed the excess of algae in the Illinois river. As a result of voracious migrant not only coped with the task set before him, but began to seize new territory, harassing the local fish. Now before American experts had a new goal — to prevent the spread of Asian (silver) carp in the Great lakes.
Interestingly, the number of carp in our area, as a rule, regulates the pike, not allowing him to multiply excessively. But in the rivers Illinois and Mississippi Continue reading
Lakes, formed from river oxbow lakes, are relatively small. Large arose in other ways. Some in valleys, blocked by avalanche or moraines, rock ridges left by retreating and now-vanished glaciers or dams erected by man. Lake Baikal in Siberia and lake in East Africa filled the huge cracks in the earth’s crust, caused by powerful shifts. American Great lakes lie in the basin, formed during the ice age when the ice wore a large part of the continent. Glaciers not only plowed a deep bowl in the valleys, along which, but this entire region sank under the weight of ice, gavluvsga a lot of the continent in plastic basalt layers under it. Then the ice melted relatively quickly, but the concavity is not yet corrected.
Around the perimeter of the great lakes in shallow bays among marsh grasses the animals and their lifestyles are not much different from what we observed in a small freshwater reservoirs. Over them worn different dragonflies, among the plants reproduce gnats and mosquitoes; hiding in the mud snails and bivalves; fish and piranhas hunt, carp and Cichlidae pluck the plants. But where the lake bottom out to a great depth, the conditions have dramatically changed.
Baikal is the deepest lake in the world. In some places the bottom is a mile from the surface. Of course, compared to the ocean it’s not much of depth, but in ocean Continue reading
Lake Rosenshine – the legacy of the last ice age in Europe. They are very young by the standards of nature and of eternity – only 10-12 thousand years.
The largest lake in the region and third largest in the whole of Belarus – lake Newerth (2657 hectares, width – 4.6 km, length – up to 18 km, depth of – up to 8 meters). Newerth – besides, one of the most beautiful in the country. It is here, in the village Muragi, in the late 18th century, was born Jan Barshcheuski, one of the founders of the new Belarusian literature, who collected all the legends, tales of native land in the book “Slahtz Zavalina, ABO Belarus at fantastyczny avadana”.
Other major lake – usveche, Volobo, the New, Rossano, Drusy, Megeve, Mino, Shevino, White. The deepest lake – Boulder (up to 12 m). The power of the lakes is mostly atmospheric. The highest water level in late early April. Ice cover lasts from late November to late February, ice thickness is on average 50-70 cm
Rivers here – sea. The river network density is 0.5 km/km2. and it belongs to the Baltic basin.
The largest river in the district – Driss -occurs throughout the area and is a right tributary Continue reading