Inland waters are dewatered in Estonia, but especially in the south — this Emajõgi river, lake Võrtsjärv and Tamula, not to mention the home ponds. Fish inhabiting them was in danger.
Last year at this time Estonia ponds were covered with ice, and land — snow. This autumn special. More on this past weekend in the gardens of roses buds swelled in Southern Estonia was seen blooming strawberries and fresh buds on the bush.
However, before the advent of cold weather concern is that the water level in the lake Võrtsjärv dropped well below average, all Emajõgi shallower, shorelines of some lakes in the hills Haanja left for five yards, bridges to jump into the water in the ponds farmhouse sticking out of the water meter.
Rev residents joke that the old man from Lake Tamula did in the bottom of the lake hole: the water level has fallen below the minimum mark on the tide gauge at the bridge Roozisaare, so even it has become difficult to measure. This one and a half meters below the water level during the spring flood.
"I do not remember the last time the water fell so low," — said the expert on Aquatic Bioresources of the Environmental Aimar Raqqa, but then I remembered that winter 2001-2002, there was a similar situation.
Fish in danger
According to a senior research fellow of the Agrarian University, hydro Külli Kangur, even just looking at Võrtsjärv enough to make sure that the water level is well below average. This is largely due to the fact that the fall was a little rain, and especially in southern Estonia.
"Every year is different, but usually by the time water is full of water", — said Kangur, noting that, for example, flowing into streams Emajõgi usually by this time full of water, but now they are completely dry.
According to another member of the Agrarian University Leah Tuvikene that deals hydrobiological monitoring Võrtsjärv lake, the water level in it half a meter below the average. The last time this was noted in 2006. "If you get up early ice, but it will lay down a thick layer of snow, the lack of light the algae will not produce oxygen, that's when the fish have very bad", — she said.
Usually the water level from the end of September and in October, starts to rise, but this year the opposite trend. His role in this was played by shallowing of the lake last winter when the ground is no time promerznut, so once the spring melt water soak into the soil.
Hydrobiologist Aimar Racca suggests that this year's water levels will not have to wait. "From the point of view of Hydrobiology, it is very bad — he said. — Lake Peipsi Zamora will not get any, but in Võrtsjärv fish may be in danger. "
Racca recalled how in the spring of 2002 began to breathe shallowed Vytsyarve acne because the ice did not go long. "It is very likely that this pattern persists today. Because of such low water levels on the eve of the winter fishery resources of the lake can be significantly reduced, "- he said, adding that the pond this year for sure promerznut to the bottom.
Hole will not help
Salvation may be, if the weather will match national signs "Late Autumn — early spring." If the ice will rise in January, the fish is still hope, but if at the end of November, there will be a difficult situation. Drilling a hole will not save, because the oxygen will be sucked into the water just outside the holes themselves, but they quickly freeze in cold weather.
According to Racca, they tried to pump water from one well to another, but it did not give any great effect.
"In a stressful situation fish cherish power and not just somewhere to sail, because the movement takes ten times more oxygen than at rest, — he explained. — That's why they are in place, and not rushing in search of oxygen. "