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Mergus is the genus of the typical mergansers fish-eating ducks in the subfamily Anatinae. 

1/ Scaly-sided merganser or Chinese merganser (Vịt mỏ nhọn, Mergus squamatus)
2/ Red-breasted merganser (Vịt cát ngực đỏ, Mergus serrator) 

anas, anatis: Latin duck.
The genus name Mergus is a Latin word to refer to an unspecified waterbird.
Mergus is a Latin word meaning "diver" or "waterfowl," derived from the verb mergere, which means "to dip" or "plunge". It was used by ancient authors to refer to an unspecified diving seabird.

Red-breasted merganser (Vịt cát ngực đỏ, Mergus serrator) 

The Red-breasted Merganser (Vịt mỏ nhọn ngực đỏ, Mergus serrator) is a diving duck, one of the sawbills. Its breeding habitat is freshwater lakes and rivers across northern North America, Greenland, Europe, and the Palearctic.

anas, anatis: Latin duck.
The genus name Mergus is a Latin word to refer to an unspecified waterbird.
Mergus is a Latin word meaning "diver" or "waterfowl," derived from the verb mergere, which means "to dip" or "plunge". It was used by ancient authors to refer to an unspecified diving seabird.

The term serrator is derived from the Latin word "serra," meaning "saw," and the related verb "serrare," meaning "to saw". In Latin, serrator can refer to a person who saws, or more commonly, it appears in the adjective form serratus, which means "sawed," "notched like a saw," or "toothed like a saw". 

Scaly-sided merganser or Chinese merganser 
(Vịt mỏ nhọn, Mergus squamatus)

The scaly-sided merganser or Chinese merganser (Mergus squamatus) is an endangered typical merganser (genus Mergus).
The bird lives in Manchuria and extreme Southeast Siberia, breeding in the north and wintering in the south.

anas, anatis: Latin duck.
The genus name Mergus is a Latin word to refer to an unspecified waterbird.
Mergus is a Latin word meaning "diver" or "waterfowl," derived from the verb mergere, which means "to dip" or "plunge". It was used by ancient authors to refer to an unspecified diving seabird.
Squamatus is a Latin word meaning "scaly" or "covered with scales". The term originates from the Latin word squama, which means "scale".