What primary feature distinguishes the skin of the Wels catfish from many other scaled freshwater fish?
Answer
The complete absence of scales; its skin is smooth and covered in thick mucus.
The Wels catfish possesses a unique epidermal structure that sets it apart from many other types of freshwater fish, which typically have scales. The skin of *Silurus glanis* is entirely scaleless, which contributes to its smooth appearance. This smooth exterior is further protected by a thick layer of mucus coating the body. This mucus layer serves a critical protective function, insulating the fish against environmental stressors and potential pathogens in its environment.
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