Well, this should be the nematodes, there are too many kinds of nematodes, and they all look similar, it is difficult to distinguish, there are many pictures of nematodes on the Internet. It's best not to eat them if they're really there, just in case. In fact, in most cases it's fine, because humans and mud snails are so distantly related that it's hard for a parasite to adapt to both. The yellowtail I originally bought had parasites in it, nematodes, and it was fine, but make sure you cook it well enough

Look at the picture, what kind of worms are these?

This is a red nematode, often seen in the gutter when I was a child, the length of the general 1 ~ 15cm, and still goldfish and other small fish better food, is due to the deterioration of water quality and rich in phosphorus and nitrogen elements. These worms themselves are not harmful and non-toxic, and belong to anaerobic organisms, it is recommended that you put the water repeatedly rinsed once, and add the appropriate salt as well as disinfectant water can solve the problem.

Red nematode pictures

Water earthworms: also known as red nematodes, red silk worm, red nematodes, belonging to the aquatic oligochaetes in the annelids, the body color is bright red or greenish gray. They live in the river basin of the bank or the bottom of the river in the sludge, dense with the sludge surface, one end fixed in the sludge, one end of the sludge out in the water quivering, once encountered alarm, immediately retracted back to the sludge. The nutritional value of water earthworms is very high, and should be rinsed repeatedly in clean water before feeding, which is a very favorite bait for goldfish and koi, and also the main bait for eel fry and young soft-shelled turtles. The Huangpu River in Shanghai has a large number of earthworms in the sludge on the bank after the river ebbs, and they are caught in large quantities in the spring and fall seasons every year. They can be eaten.