Coilia brachygnathus belongs to the order Coilia, family Coiliaceae, and genus Coilia. Commonly known as: hairy fish, anchovies. English name: Shortjaw tapertail anchovy.
The body shape is similar to that of a dolphin, with the main difference being that the maxilla is shorter and extends backward no more than the trailing edge of the gill cover; the number of longitudinal scales on the sides of the body is smaller. Most of them live in the middle reaches of the Yangtze River, and occasionally appear in the Yangtze Estuary area. It grows, develops and reproduces in rivers and lakes, and prefers to live in lakes. It usually swims in the middle and upper layers of water, but in winter it overwinters in the deep water layer. Generally, male fish are 12 centimeters long and weigh more than 6.5 grams. Male fish are sexually mature when they are 15.3 centimeters and weigh more than 13.7 grams. They can lay eggs in still water or slow flow. The reproductive season is from April to May. Individuals of different sizes have different feeding habits. Larger individuals with a body length of more than 25 cm mainly feed on fish and shrimp; individuals with a body length of less than 15 cm mainly feed on copepods, cladocerans and insect larvae; young fish mainly feed on zooplankton. Brachygnathus is highly produced in the affiliated lakes of the middle and lower reaches of the Yangtze River.
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