Nam Ty commune in Hoang Su Phi district, northern mountainous Ha Giang province, has been experimenting with cold water fish farming and the model has brought about high economic value.
The weather in northern localities is forecast to become chillier in November, with four to six cold spells expected to sweep over the region in the month, according to the National Centre for Hydro-Meteorological Forecasting.
Temperatures in Ho Chi Minh City have fallen to 10 degrees Celsius minimums and 22 maximums in recent days, making young and old rug up to guard against the chill.