Nicknames: Silurus meridionalis and Silurus meridionalis deletion atlas.

Origin and distribution: mainly distributed in a large area of water south of the Yangtze River.

Description: Silurus meridionalis belongs to warm-water bottom fish and is a valuable economic fish. The demand for dissolved oxygen in water of Silurus meridionalis is slightly higher than that of four kinds of big fish. When the dissolved oxygen in water is above 5mg/L, the growth rate is the fastest and the feed conversion rate is the highest. When the dissolved oxygen is lower than 2mg/L, the phenomenon of floating head appears. The adaptive pH range is 6 ~ 9. The southern catfish, which lurks during the day and goes out at night, is docile, does not drill mud and is easy to catch. Silurus meridionalis is a fierce carnivorous fish. Under natural conditions, it mainly preys on all kinds of wild fish, loach, earthworm, snail meat, domestic fry, aquatic insects and other aquatic animals and animal carcasses. Can swallow an individual with a body length of 1/3 ~ 2/3. Under the condition of pond, artificial compound feed can be eaten well after domestication and feeding. When hungry, there is a serious cannibalism in the group. In natural waters, the weight of 1 year-old giant salamander is 0.4 ~ 0.5 kg; 2 years old 1.2 ~ 1.5 kg: 3 years old, 2.3 ~ 2.9 kg. Under the condition of artificial feeding, its growth rate is much faster than that in natural waters because of sufficient feed.