1. Scaleless fish include sea eel, sea eel, loach, eel, catfish and whitebait. Scaleless fish does not mean fish without scales at all, but fish with natural scales or small scales. There are scaleless fish in both ocean and fresh water.

2. Most scaleless fish living in the sea live in the deep sea with a depth of more than 500 meters, mainly in the order Anguilla. A fish without scales is not a fish without scales. Marine fish such as pomfret, hairtail, mackerel and tuna are also scaleless fish.

3. In fact, scaleless fish and scaly fish are just different fish species, and there is not much difference in nutritional value.