Are there any fish in Qinghai Lake?

Different from more than 400 species of fish living in the Yangtze River basin, the composition of fish in the Qinghai Lake basin is relatively simple. Except for carp, crucian carp and other fish, there are only 9 kinds of local indigenous fish, most of which are yellow croaker, which is the common name of Qinghai naked carp. This fish was actually a Yellow River carp10.3 million years ago, but with the independence of Qinghai Lake, it gradually degenerated into scales and evolved into a new species.

In the 1960s, people near Qinghai Lake spent the most difficult time relying on yellow croaker, with an annual catch of 50 million Jin, which also brought extinction to yellow croaker. The number of yellow croaker in the lake decreased sharply, and it was on the verge of extinction several times. In the 1970s, the total amount was less than 1000 tons.

In order to protect yellow croaker, Qinghai Lake was closed for the first time in 1982, and 1994 was listed as a second-class protected animal. Up to now, Qinghai Lake has been closed for six times, and the sixth time it was closed for fishing from 202 1 1.

Living habits of yellow croaker

1. Behavior: Yellow croaker usually moves in the shallow waters of lakes for food, overwinters in the deep waters in winter, and the freezing period is 4 ~ 5 months.

2. Feeding habits: Yellow croaker is a broad-spectrum omnivorous fish, which mainly feeds on algae and zooplankton. Adult fish often devour decaying plant debris, aquatic insects and fish.

In the process of its growth and development, its feeding habits can be divided into three different stages: the first stage mainly feeds on small zooplankton, the second stage mainly feeds on large zooplankton, and the third stage (that is, the dormant period) almost all biological foods in the water appear in the digestive tract of fish, which is suitable for the environment of lacking feed in Qinghai Lake. During migration and spawning, its food intake is greatly reduced, and even it stops eating for a short time.

Reference to the above content: Baidu Encyclopedia-Qinghai Lake