Native fish decreased

    Researchers led by head of the Laboratory of Hydrobiology and Fish Analysis of the Institute of Biology of the Mongolian Academy of Sciences, Dr. Ch.Ayushsuren carried out a useful resource examine in Buir, Ugii and Dood Tsagaan lakes beneath the theme “Main merchandise of Mongolian lakes”. The researchers estimated that the catchable fish inventory of Buir Lake is 360 tons, and it’s estimated that 55 tons to 70 tons might be extracted per yr. In 1954, in line with a survey carried out within the Buir Lake, 77 % have been pike, eight % have been roach, 5 % carp, three % white pike, and two % have been taimen. Nevertheless, it has decreased to 57 % of carp, 17.5 % of pike, and eight.5 % of the silver division.

The organic assets of Dood Tsagaan Lake are estimated at 56.2 tons, and the catch is eight to 11 tons. Within the Nineteen Seventies, 70 % of the lake’s inventory was made up of white fish alone, however lately, it has elevated to 52 % attributable to grayling. It was discovered that the physique dimension of pike, roach, and thalamus fish decreased considerably, whereas the dimensions of the carp fish didn’t change a lot.

Furthermore, the reserves of Ugii Lake have been estimated at 80.6 tons. It was concluded that it’s applicable to not exceed 15 to twenty % of the full inventory when fishing. Because of hydro chemical analysis, it turned clear that these lakes have been uncovered to massive quantities of natural air pollution, and the species of native fish have been lowered, and the expansion and survival fee of a few of them elevated dramatically. The researchers concluded that the lower in fish shares is especially brought on by air pollution brought on by unlawful fishing, waste, animal impacts, water use, and fertilizers utilized in agriculture.