While only about 10 percent of the Black Sea is suitable for life 200 species of fish It also contains water, but in the depths the situation is a little different.

Only a few living species survive What is the secret of the depth?

Let’s look at the chemical structure of the Black Sea.

The surface waters of the Black Sea, like other seas, rich in oxygen and in these layers various marine animals can survive. However, from a depth of 150-200 meters things change.

after depth hydrogen sulfide (H₂S) The density of the gas increases. Hydrogen sulfide is a colorless but highly toxic gas with a rotten egg odor and displaces oxygen. In this situation in the absence of oxygen and thus makes it impossible for aerobic (those that live on oxygen) creatures to live here.

So how is hydrogen sulfide so concentrated in the Black Sea?

The main reason for this is the unique geographical and hydrological structure of the Black Sea. The Black Sea is fed by the large rivers around it (Danube, Dniester and Dnieper). These rivers are also rich in organic matter. They carry rich water and in the depths of the Black Sea, hydrogen sulfide is released when these organic substances are broken down by bacteria.

The hydrogen sulfide layer on the bottom of the Black Sea is a protective layer for marine animals. a deadly environment because most living things cannot survive in oxygen-free conditions.

just something special anaerobic (living in an oxygen-free environment) Bacteria can survive in harsh conditions. These bacteria also use hydrogen sulfide as an energy source and survive.

This unique structure of the Black Sea has serious consequences for the marine ecosystem.

This toxic environment at depth has a major impact on fishing and other seafood industries. Fishermen, who can only fish at certain depths, cannot exceed these limits. this also limits economic activities and makes it difficult to maintain the ecological balance.

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