Problem description:

Once, our teacher said that shad (maybe swordfish, I don't remember clearly) swam from the sea to the Yangtze River to lay eggs. After laying eggs, the body becomes very thin, shriveled and exhausted, and some fishermen fish up and sell them at this time. Because it is not as fat as before and its nutritional value is not as high as before, it is called "Yu Xiang".

If it is quoted from other places, please give a link, thank you!

I will get extra points for the correct answer. Thank you.

Analysis:

Giant salamander and thrush fish (actually giant salamander, called "thrush" in Jiangyin and Wuxi) are actually very similar, but the main difference between the two different fish is that the mouth of giant salamander is flat, the mouth of giant salamander is upturned, and the meat of giant salamander is far less fat than that of giant salamander. Therefore, some fishermen have the saying that "when you get there, it is a herring, and it is classified as a thrush."

The appearance of Shad, :image.baidu/i? . CT = * * * * * * * * * * * & amp； z = 0 & amptn = baiduimagedetail & ampF6 % E5 % D3 % E3 & amp； in = 13 & amp； cl = 2 & ampcm= 1。 sc = 0 & amplm=- 1。 pn = 12 & amp； rn= 1

What does the giant fish look like, :image.baidu/i? . CT = * * * * * * * * * & amp； z = 0 & amptn = baiduimagedetail & ampF7 % A6 % D3 % E3 & amp； in = 1 & amp； cl = 2 & ampcm= 1。 sc = 0 & amplm=- 1。 pn = 0 & amprn= 1