Cathorops agassizii is a species of sea catfish in the family Ariidae. It was described by Carl H. and Rosa Smith Eigenmann in 1888, originally under the genus Tachisurus.Eigenmann, C. H. and R. S. Eigenmann 1888 (18 July) [ref. 1249] Preliminary notes on South American Nematognathi. I. Proceedings of the California Academy of Sciences (Series 2) v. 1 (pt 2): 119-172. It is a tropical freshwater fish which is known from Guyana and Brazil. It reaches a maximum length of .
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