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The influence of water level on fish bite

Throughout the year, the water level in rivers, lakes and reservoirs is constantly changing. In the spring, during floods, the water rises sharply, flooding the coastline, and in the summer, during drought, a sharp drop in level is observed. Such changes significantly affect the fish bite.

Fishermen have long noticed that the fish bite is good when the water level in the river is stable and there are no sudden changes. The fish instinctively senses such changes and reduces its activity to a minimum level. In this article we will look at how changes in water levels in reservoirs affect fish biting and what an angler needs to do in such situations.

Decrease in water level due to heat

IN summer time rivers and lakes often become shallow due to dry weather and lack of rain for a long time. It often happens that in the spring the water overflows its banks, flooding the trees and bushes on the shore, and in the middle of summer the water level has dropped so much that the reeds stand in the middle of the dry ground, although previously the water reached half the height of the stems.

The smaller the river and the slower the flow, the more its water level changes. However, the fish has adapted to such changes and knows the places where it is most comfortable. In summer it fills holes, and in spring it is often located in the coastal zone. However, if there is abnormal heat and the water temperature rises significantly, then in such conditions the fish have a very hard time. The oxygen balance deteriorates and she has to look for more suitable places to live. She will peck well only at night and early in the morning. This is often observed in July in reservoirs, lakes and rivers with a small current.

On large and medium-sized rivers, even a slight decrease in water level in the summer greatly affects the fish bite. It is enough for the water level to drop a few centimeters, and the fish leaves the places where a good bite was previously observed. Moreover, the contrast is so significant that even experienced fishermen are surprised by it. It would seem like 5 days ago white fish It was regularly caught on the feeder and float rigs, but now it seems to have frozen and the tips are standing and not even moving.

Based on this behavior, we can conclude that the fish reduces its activity not so much because of the decrease in level, but because of the changed pressure exerted by the water. As you know, fish sense changes in pressure very well, not only atmospheric, but also water.

Anglers who are trying to catch fish in the heat, when the water drops, can be recommended to find holes, steep edges with depths of more than 5 meters, and fish there. It also makes sense to fish near trees, in the shade, and on riffles, in places with a current.

Rising water level

In spring, during floods, the increase in water level is most noticeable. The increase in water in autumn and summer during periods of prolonged rain is also clearly visible. A lot of water is added at the beginning of spring, when glaciers melt and water that formed after the snow melts flows from the banks.

Nature has decreed that the rise in water level coincides with the spawning period of many fish. This is quite logical, since as water rises, the number of places in which fish can lay eggs increases.

Fishermen can be advised to fish in shallow water areas that have already warmed up quite well and where there is a rich food supply. At this time, the floaters have complete freedom. You can fish with a fly rod or a Bolognese rod and count on good catches. You just need to wait until the water level stops rapidly increasing and more or less stabilizes.

Usually the bite during the spawning period is very good. Any angler can count on catching, if not a record number of fish, but a very significant one. The fish bite will worsen spring time maybe due to changes in atmospheric pressure.

In summer, when the water rises, there is usually an increase in fish biting. In such cases, the oxygen level in reservoirs increases, and the fish bite better. It is quite appropriate to draw an analogy with people here. When it's hot outside, few people want to go outside. But when it passes good rain, it’s much easier to breathe and it’s so nice to go outside.

Same with fish. Small specimens visit coastal areas and begin to actively feed. Average and big fish likes to stay on the edges and stands at the exits from pits. Therefore, bottom fishers and feeders must take this moment into account and throw their equipment into these places. Pike often visits the coastal zone during such periods. She is very knowledgeable about large quantities fry in these places. She has enough oxygen, and she is in no hurry to leave such areas. As for roach and bream, during the period of rising water these fish often occupy places with depths of 3-4 meters. Roach can stay in the water column. Bream likes to feed in the bottom layer. When the water level stabilizes, schools of bream move to flat and clean areas, the so-called tables with a depth of 4-5 meters.

Changes in water levels on regulated rivers and reservoirs

Those fishermen who spend a lot of time on regulated reservoirs know very well how the fish bite can change during the period when water is given and when you have to wait for this moment. When the floodgates at the hydroelectric power station are opened, the water level rises sharply. At this time, the fish bite immediately intensifies. On the one hand, this is good. But on the other hand, not very much. When water is not given, the fish bite very weakly. This has long been tested by practice by all fishermen. It doesn't matter what time of year it is. If the locks don’t open, then you have to be bored on the shore. It seems that the fish have already adapted to this regime, and you have to try very hard to get it to bite when there is no current.

There are also more negative aspects when there is a planned release of water from reservoirs. Here the word “planned” is very dubious. This is a person planning something for himself. But if you lose more than the norm, then this action is guaranteed to kill significant amount fish. An ordinary freeze will occur.

In general, a significant decrease in water level, artificially created, always affects the behavior of fish. This is a kind of signal that something needs to change. familiar places habitats to more suitable ones. At the end of February, many reservoirs often release water. If this situation repeats itself over many years, then the fish’s reaction is not so painful. She already has no problems finding secluded places for herself: holes, edges, etc.

How do fish behave after water is released in regulated reservoirs? At first, its bite practically disappears. It concentrates in local areas and does not want to peck either the fishing rod or the bottom tackle. The same applies to spinning baits.

After adding water, the fish bite is restored to its previous level. It is well caught in the summer in the coastal zone with a fishing rod, and with donks and feeders at promising points.

Differences in the behavior of fish before and after the discharge are most noticeable in medium-sized and small-sized reservoirs. Typically, in small rivers, lakes and reservoirs, after water is released, there is a significant deterioration in the bite. On large bodies of water the situation is different. Although the bite is deteriorating, it is not so significant. The fish have learned to quickly adapt to planned discharges and large kills usually do not occur.

If there is a hydroelectric power station on a river or reservoir, then the water level changes cyclically, on certain days and hours. That is, the locks open and the water begins to flow within a certain number of hours. It becomes noticeable to the naked eye how much the level increases. Typically the process occurs in such a way that a short time work out greatest number energy.

A typical picture when on weekends large rivers- There is practically no current in the Volga and Dnieper, but on weekdays the floodgates open and the water rises. In this regard, many people plan fishing on weekdays.

The behavior of fish in such waters is as follows. When water is discharged, the flocks concentrate along the channel edges. Donors and feeders also throw their gear there, and boatmen anchor and successfully catch fish. When the water rises, the fish move closer to the shore. Living conditions and oxygen balance are quite favorable for it and there is no need for constant stay on pits and edges.

As mentioned above, at the end of winter, water is released from regulated reservoirs. This is done in order to minimize the impact of floods during the melting of snow and ice on the rivers. Also, during the release of water, the river bed is cleaned. After the water is released, the fish bite increases sharply. Fishermen know this well. By the last ice at the junction of winter and spring, many people take their souls off, compensating for shortfalls in previous winter fishing trips.

In what places to fish when the water level in the reservoir changes?

If there is a sharp decrease in water level, then the emphasis should be on areas with flow with a favorable oxygen balance, on holes and channel edges. The most promising will be fishing from a boat on the river bed.

On regulated rivers it is better to fish at the moment when water is available. The bite is much better at this time. When water is not given, you must again try to find an area with a current and good depth.

When the water level rises gradually, the fish will bite well where there is food supply. For example, in a coastal zone, just behind a wall of vegetation. Shallow water areas also become fishy at this time. Floaters note a significant improvement in the bite. This is especially noticeable at night. The fishing rods sometimes catch heavy bream, rather large crucian carp and roach.

If the water level rises sharply, the bite worsens for several hours, but soon stabilizes. The most promising area in this case will be the border between fast and slow flow, located near the coast.

When the water level changes, it is important to find fish sites. They are unchangeable. If you manage to find them, the catch of spruce is not guaranteed, but very likely. The success of fishing is greatly influenced by the strength of the current and the degree of turbidity of the water.

You should always remember that fish look not only for deep places in the reservoir, but also for those in which the oxygen level is favorable for it. Therefore, when the water level drops, especially sharply, always look for riffles and areas with currents. Place a heavier weight or feeder and catch fish after pre-feeding. Full review biting activity different fish depending on the time of year, look at the page - you will get acquainted with the main types, as well as the tactics for using them.

Study everything to become a real fisherman and learn how to make the right choice.

Approximately 71% of the surface of our planet is covered with water, so assessing sea level changes is one of the most important tasks that allow scientists to predict further changes in the climate on Earth and the living conditions of people living in different regions planets. Before today scientists believed that they knew exactly the dynamics of sea level change. That's a sea level rise of 1.6 cm per decade since 1900. In any case, this is exactly the data provided by the National Oceanic and Atmospheric Administration (NOAA). The main cause of sea level rise is global warming.

The results of a new study, published in October in Geophysical Research Letters, suggest that scientists underestimated this value. In some regions, sea level rise is occurring faster than the generally accepted rate, by about 5-28%. Global sea level, according to the study's authors, has risen by no less than 14 centimeters over the past hundred years, and in some regions by as much as 17 centimeters.

The reason for this underestimation was revealed by scientists from the Laboratory jet propulsion NASA and the University of Hawaii at Manoa. By comparing parameters from the current climate model with sea level measurements from previous years, the team of climate scientists found that readings from coastal tide gauges may not be as representative as thought and such data cannot be used as a benchmark. Sensors located in many locations in the Northern Hemisphere are the primary source of data for measuring global sea level over the past several decades.

“This is not a situation where the data is wrong or the tools are not working properly. For a number of reasons, sea levels are not changing at the same rate across the planet,” says Philip Thompson, who led the study. “As it turns out, our data is collected in places where sea levels are rising least rapidly due to global warming.”

Typically, water level measuring stations are stationary. In addition to the water level, such stations can also determine weather region, including pressure and wind speed, factors that often influence sea level measurements.

The only problem in this whole situation is the places where such stations are located. According to the study, most of the stations are in the Northern Hemisphere, where the ice cover is melting faster than in Southern Hemisphere.

As it turned out, sea level changes more strongly not where the main factor of change in the water level of the World Ocean operates. In fact, this level increases most actively in places remote from this factor. According to one source, melting ice in the Northern Hemisphere of the Earth has the greatest impact on rising water levels in the “southern part of the world.” Pacific Ocean and the equator."

The project team also believes they have discovered a reason why the effects of melting ice may differ from region to region. For example, changes in China may differ significantly from changes in the United States or Africa. The rate of sea level rise differs in different regions due to additional factors. It could be the winds ocean currents, gravity, tides.

Consequences of melting ice in Greenland. Regions with record sea level rise are shown in brown.

“This is very important because it is likely that the influence of certain winds or currents may be causing the rate of sea level rise to be underestimated,” Thompson says. The scientist says that all this is not an accident; specialists need to change the rate of sea level rise upward. Climatologists make a variety of forecasts, but most experts agree on one thing - global warming really exists, and it is the reason for the rapid melting of ice in both hemispheres of the Earth. Professor Peter Wadhams from Cambridge, for example, that this or next year the Arctic may be completely free of ice, which has not happened in the last 100 thousand years.

This year we are seeing new climate records. For example, every month of this year is the warmest on record. NASA representatives claim that ice now covers 40% less area in summer than thirty years ago. If the Antarctic Ice Sheet continues to melt, future sea levels will rise by 3.6 meters, which will wipe out many coastal cities.

Imagine yourself on a beautiful beach anywhere in the world. This might be your favorite place. The waves splash on the shore, the sun sparkles over the water, and you feel the refreshing breeze...

Now imagine that this beach has disappeared forever. Sea levels have risen and the coastline has moved hundreds of meters inland. It's certainly jarring to imagine such dramatic changes in familiar places, but climate change experts say they have overwhelming evidence that sea levels are rising, and at a rapid rate. But how much can it really rise? And what will the price be for coastal residents?

How are sea level changes measured?

Scientists first realized that sea levels were changing in the early 20th century. In 1941, Beno Guttenberg, a geophysicist, analyzed tide gauge data. These are special instruments located along coastlines that change sea level. He noticed something strange. Since these measurements began, sea levels have risen. Although the data from these instruments is now considered highly unreliable, in 1993 NASA and the French Space Agency sent satellite radar altimeters into space. Consequently, we now have a much more accurate picture of sea level throughout to the globe. These instruments confirmed that sea levels are rising.

Reasons for changes

Now we know that warm climate is driving force changes. For example, simple physics tells us that water begins to increase in volume as it heats up. Expansion from warm ocean waters has made the largest contribution to global sea level rise over the past century.

This thermal expansion of water will continue, but there is another, more known issue, which could lead to very dramatic sea level changes in the future: melting glaciers and ice sheets could release great amount water. What should you expect after this?

To answer this question, it is necessary to study changes in sea level in the past.

Sea level changes during the Pliocene

Geologists can find past coastlines using sedimentary rocks. They show what the sea level was. Some scientists are studying the shells of ancient organisms buried in ocean sediments and salt marshes. Of particular interest to us is the Pliocene - about 3 million years ago. Temperatures in the Pliocene, according to scientists, were 2-3 degrees higher than in the pre-industrial period, which means that it is 1-2 degrees warmer than now.

Temperatures in the Pliocene are similar to the 2 degrees warming limit set by the government in Paris last year. It does this period very useful for imagining future sea level rise.

The frightening thing is that estimates of sea level in the mid-Pliocene are in the range of 10-40 meters above the present. In other words, we can say that such warming will guarantee a significant rise in sea levels.

Should you worry about temps?

Let's get back to the present. We recently learned that it's not just the magnitude of sea level change that we need to worry about. A study published in March 2016 found that sea level rise in the 20th century was faster than in any other of the previous 27 centuries.

What makes this study unique is that the scientists used rigorous statistical methods as well as sea level records over more high resolution, developed over the last decade. This allowed them to create the first database of global sea levels over the past 3,000 years. This record shows us that there is a 95% chance that sea levels were rising as fast 2,800 years ago as they have been in the 20th century. Moreover, in the last two decades, global sea level rise has occurred more than twice as fast as in the 20th century. The study highlights the extreme sensitivity of sea levels to even small temperature fluctuations.

In fact, this extraordinary rise in sea level is occurring in parallel with an equal increase in temperatures. Physics tells us that global changes temperatures and sea level change should go hand in hand. This is what has been happening for the last two thousand years.

Knowing that we are currently experiencing unprecedented sea level rise is very helpful. But this doesn't tell us what level the oceans will be in the future, which is vital important information if we want to plan coastal zones according to this.

What to expect already in this century?

The authors of another study found that we can expect sea levels to rise between 50 and 130 cm by the end of this century unless we sharply reduce greenhouse gas emissions. These data are in line with predictions made by the UN Intergovernmental Panel on Climate Change that sea levels will rise between 50 and 100 cm by 2100.

Exists whole line these predictions because the calculations use assumed emission scenarios. In addition, there is still uncertainty about when and how the ice will melt. Computer models for the large ice sheets of Greenland and Antarctica have improved significantly, but uncertainty remains, especially regarding icebergs.

So what sea level can we realistically achieve?

Theoretically, if all the ice on the planet melted, sea levels would rise by about 55 meters. But this is unlikely to happen in soon. IN last time This happened on Earth 40 million years ago, when atmospheric carbon dioxide levels were higher than 1000 parts per million. Currently this level is 400 ppm.

But even if the maximum sea level rise this century is unlikely to be more than 2 meters from the global average, it will be enough to inundate many low-lying coastal areas, increasing the risk of flooding and displacing millions of people from their homes.

There are some other things to keep in mind when planning your sea defense. Regional changes in its level may deviate from the global average, so some places will be significantly worse than others. According to scientists, coastal cities in the basin Atlantic Ocean will suffer more from rising sea levels than those in the Pacific.

Can sea level rise be slowed down?

This is possible, but only if the government and people start taking action. To slow sea level rise, we must stop rising temperatures. This means that humanity must abandon carbon-emitting energy technologies. Many scientists agree that this plan is the only viable option. Although there are other ideas. One of them involves pumping water from the ocean to Antarctica to freeze it there again. However, scientists have discovered that such pumped water will turn into solid ice, but this will increase the weight of the Antarctic ice sheet, which will increase the flow of ice into the ocean. Storing water as ice for millennia would require more than one-tenth of the global energy balance. So maybe this isn't the best solution.

What to do next?

So all we have to do is reduce greenhouse gas emissions if we want to stop sea level rise. In addition, significant investment in local coast guard. Without this kind of investment we will see the gradual disappearance coastal areas. This will lead to huge losses considering that 44% of the world's population lives within 150 km of the coast.

The unpopular truth is that human activity has caused climate change and sea level rise. This has led to changes in coastlines. The consequences of these activities will be felt for generations.

Approximately 71% of the surface of our planet is covered with water, so assessing changes in sea level is one of the most important tasks that allow scientists to predict further changes in the climate on Earth and the living conditions of people living in different regions of the planet.

Until now, scientists believed that they knew exactly the dynamics of sea level change. That's a sea level rise of 1.6 cm per decade since 1900. In any case, this is exactly the data provided by the National Oceanic and Atmospheric Administration (NOAA). The main cause of sea level rise is global warming.

The results of a new study, published in October in Geophysical Research Letters, suggest that scientists underestimated this value. In some regions, sea level rise is occurring faster than the generally accepted rate, by about 5-28%. Global sea level, according to the study's authors, has risen by no less than 14 centimeters over the past hundred years, and in some regions by as much as 17 centimeters.

The reason for this underestimation was revealed by scientists from NASA's Jet Propulsion Laboratory and the University of Hawaii at Manoa. By comparing parameters from the current climate model with sea level measurements from previous years, the team of climate scientists found that readings from coastal tide gauges may not be as representative as thought and such data cannot be used as a benchmark. Sensors located in many locations in the Northern Hemisphere are the primary source of data for measuring global sea level over the past several decades.

“This is not a situation where the data is wrong or the tools are not working properly. For a number of reasons, sea levels are not changing at the same rate across the planet,” says Philip Thompson, who led the study. “As it turns out, our data is collected in places where sea levels are rising least rapidly due to global warming.”

Typically, water level measuring stations are stationary. In addition to water levels, such stations can also determine a region's weather conditions, including pressure and wind speed, factors that often influence sea level measurements.

The only problem in this whole situation is the places where such stations are located. According to the study, most of the stations are in the Northern Hemisphere, where ice cover is melting faster than in the Southern Hemisphere.

As it turned out, sea level changes more strongly not where the main factor of change in the water level of the World Ocean operates. In fact, this level increases most actively in places remote from this factor. According to one source, melting ice in Earth's Northern Hemisphere has the greatest impact on rising water levels in the "South Pacific and equator."

The project team also believes they have discovered a reason why the effects of melting ice may differ from region to region. For example, changes in China may differ significantly from changes in the United States or Africa. The rate of sea level rise varies in different regions due to additional factors. These could be winds, ocean currents, gravity, tides.

“This is very important because it is likely that the influence of certain winds or currents may be causing the rate of sea level rise to be underestimated,” Thompson says. The scientist says that all this is not an accident; specialists need to change the rate of sea level rise upward. Climatologists make a variety of forecasts, but most experts agree on one thing - global warming really exists, and it is the reason for the rapid melting of ice in both hemispheres of the Earth. Professor Peter Wadhams from Cambridge, for example, argues that this year or next the Arctic could be completely free of ice, which has not happened in the last 100 thousand years.

This year we are seeing new climate records. For example, every month of this year is the warmest on record. NASA representatives claim that ice now covers 40% less area in summer than thirty years ago. If the Antarctic Ice Sheet continues to melt, future sea levels will rise by 3.6 meters, which will wipe out many coastal cities.