The Collaborative International Dictionary of English v.0.48:

Ablet \Ab"let\, Ablen \Ab"len\[F. ablet, ablette, a dim. fr. LL.
   abula, for albula, dim. of albus white. Cf. Abele.] (Zool.)
   A small fresh-water fish (Leuciscus alburnus); the bleak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bleak \Bleak\, n. [From Bleak, a., cf. Blay.] (Zool.)
   A small European river fish (Leuciscus alburnus), of the
   family Cyprinid[ae]; the blay. [Written also blick.]
   [1913 Webster]

   Note: The silvery pigment lining the scales of the bleak is
         used in the manufacture of artificial pearls. --Baird.
         [1913 Webster]