Is the Caspian Sea rich in fish resources? why

More than ten thousand years ago, the Caspian Sea was connected with the Black Sea and the Mediterranean Sea. After the crustal movement, the Caucasus mountains rose, separating the Caspian Sea from the ocean, thus forming today's inland lake. The Caspian Sea is a saltwater lake with an average salinity of 1 1- 13 per thousand.

Caspian Sea is the largest inland lake in the world, covering an area of about 376,000 square kilometers. It is about 1200 km long from north to south, 320 km wide from east to west and 7000 km coastline. Its altitude is -27.9 meters. The average depth of the Caspian Sea is 5-8m in the north,170-788m in the middle and1050m in the south. The average depth of the entire Caspian Sea is1.84m, and the water storage capacity of the lake is 7.6 trillion cubic meters. The annual evaporation of sea surface reaches 1000 mm. The Caspian Sea has 50 islands with a total area of about 350 square kilometers. The Volga, ural river, Kula and telek rivers flow into the Caspian Sea.

The Caspian Sea provides excellent water transport conditions for coastal countries. There are many ports along the coast, some of which are connected with railways, and trains can go directly to ferries. The main ports are Baku (Azerbaijan), astrakhan (Russia), Aktau (Kazakhstan), Fuehrer (Turkmenistan) and Li Enze (Iran), among which Baku is the largest port.

The Caspian Sea is rich in fish resources, rich in sturgeon, accounting for about 80% of the total sturgeon in the world, as well as European bream, carp and barracuda. Due to the development of coastal industries, the pollution of Caspian Sea is becoming more and more serious, and the fish resources are decreasing year by year. Caspian basin is rich in oil and natural gas resources, with reserves of 30 billion tons and 23 trillion cubic meters respectively.

Russia, Kazakhstan, Azerbaijan, Iran and Turkmenistan are negotiating on the legal status and delimitation of the Caspian Sea, the development and transportation of oil and gas resources and the protection of the ecological environment. The five-nation negotiating working group was established in 1997 and held many consultations and meetings at the level of vice foreign ministers and foreign ministers. On April 23rd, 2002 and October 6th, 2007, 65438+65438+ were held in Ashgabat and Tehran respectively. In 2009, 1 12, Russia, Kazakhstan, Turkey and Albania held an informal summit in Aktau. This year, 65438. The heads of state of the five countries held their third summit in Baku and signed an agreement on security cooperation in the Caspian Sea, stipulating that it is the privilege and obligation of all parties to ensure the security of the Caspian Sea, and should continue to deepen cooperation in combating terrorism, illegal immigration, drug trafficking, arms trafficking, organized crime and money laundering.

After many consultations, the parties have reached an agreement on the legal status of 70% of the Caspian Sea. Russia, Kazakhstan, Albania and Turkey agree to divide the Caspian Sea floor according to the principle of coastal midline, but Turkey has reservations about the three blocks being developed in Albania, namely Kalldahl, Hazare and Osman, which should be classified into soil. Iran insists on dividing the seabed equally and gets at least 20% of the area. All parties agreed that the legal status and security of the Caspian Sea should be settled by the five coastal countries through consultation, and the trend of militarization in the Caspian Sea region should be prevented.