鯰 - fresh-water catfish, (kokuji)

electric catfish (any species of family Malapteruridae, esp. species Malapterurus electricus)

Lake Biwa catfish (Silurus biwaensis)

Wels catfish (Silurus glanis)

woodblock print depicting a giant catfish (popular in Edo after the 1855 earthquake)

(person) slippery as an eel

electric catfish (any species of family Malapteruridae, esp. species Malapterurus electricus)

upside-down catfish (Synodontis nigriventris)

catfish (esp. the Amur catfish, Silurus asotus)