The Collaborative International Dictionary of English v.0.48:

Lates \La"tes\, n. [NL., fr. Gr. ? a fish of the Nile.] (Zool.)
   A genus of large percoid fishes, of which one species (Lates
   Niloticus) inhabits the Nile, and another (Lates
   calcarifer) is found in the Ganges and other Indian rivers.
   They are valued as food fishes.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Lates
    n 1: a genus of large percoid fishes of fresh and brackish water
         [syn: Lates, genus Lates]