Jiang Dao's body is slightly narrow, its abdomen is covered with silver scales and fat, and its tail has a beautiful arc like a knife. Fish's eyes are smaller than Hu Dao's, with bright red gills and black tail, which have obvious characteristics of white scales, black tail and small eyes.
The blade of Lake Dao is slightly wider than that of River Dao, and the blade is straight without radian, usually it can only grow to 2 Liang at most. The eyes of the lake knife are bigger than those of the river knife. The gills are purple instead of red, and the tail is yellow.
Living habits of Yangtze river swordfish;
The bonito distributed in China's offshore waters, during the growth, development and fattening period, mostly lives in the muddy seabed and belongs to shallow sea bottom fish. The bonito is not integrated into a large group in the ocean, but mostly scattered in the bottom of the coastal and nearby waters, belonging to offshore benthic fish. Entering the vicinity of the Yangtze River estuary, large groups gradually merge, rising from the bottom to the middle and upper levels, mostly inhabiting muddy waters with less clear water.
Stop eating during reproductive migration. Widely distributed in the middle and lower reaches of the Yangtze River, from the Yangtze estuary to Dongting Lake, including rivers and lakes in Tongjiang. Some bonito can enter Qiantang River in early spring and trace back to Tonglu area, but the number is small, mainly distributed in the offshore. They not only overwinter in the bottom of the nearby sea area, but also enter the shallows and bays with less wind and waves on the island coast to feed.