1. Different species: The scientific name of sea catfish is Chinese catfish, and their species are different from those of river catfish. Although they are all called catfish, they are two different species. Silurus meridionalis belongs to the genus Silurus of Siluridae, while river catfish belongs to the species of Siluriformes, Siluriformes, Siluriformes and Catfish, which are quite different from each other in species.

2. Different living ranges: Silurus meridionalis and river catfish live in different living ranges. As the name implies, Silurus meridionalis mainly lives in the ocean and is distributed in the Yellow Sea, Bohai Sea and East China Sea. River catfish live in river water. They are a kind of fish with wide distribution, and they are found in most fresh water.

3. Different habits: Silurus meridionalis is a warm water fish, which likes to live under the water. They have the habit of migration and will move to other warm sea areas when the temperature changes. River catfish have strong adaptability and a wide acceptable temperature range. Under normal circumstances, they can grow in water temperature between 9-30 ℃.

Catfish like to live in the bottom, they are afraid of light, and fierce character. During the day, they mainly inhabit crevices, deep pits and the bottom of tree roots, and like to forage in the early morning and evening. The biggest characteristic of catfish is that they are scaleless, they are smooth as a whole, and their bodies secrete more mucus, which can reduce the pressure when they move in water.