East Siberian Sea runoff into the East Siberian Sea is relatively small at about 250 km/year that makes only 10% of the total runoff in all the Arctic seas of Russia. The largest contribution is from the Kolyma River at 132 km, followed by the Indigirka River at 59 km. Most runoff (90%) occurs in summer; it is concentrated near the coast, owing to the weak river currents, and therefore does not significantly affect the sea hydrology. The water exchange between the neighboring seas is as follows. The annual outflow to the Laptev Sea, Chukchi Sea and Arctic Ocean is 3,240, 6,600 and
East Siberian Sea only local importance. Fishery mostly targets salmon, halibut and crab. Data exist on fish production, which in 2005 was distributed, in thousand tonnes as follows: sardine (1.6), Arctic cisco (1.8), Bering cisco (2.2), broad whitefish (2.7), Muksun (2.8) and others (3.6). The principal port is Pevek (in the Chaunskaya Bay) After the breakup of the Soviet Union, commercial navigation in the Arctic went into decline. Nowadays more or less regular shipping occurs only between Pevek and Vladivostok. Ports in the northern Siberian coast located between Dudinka and Pevek see next to no shipping at all. Since 1944, most electricity for