cucumber fish

noun4

1. •
   Any Australian grayling (Prototroctes maraena).
2. •
   Any fish of the Australian genus Paraulopus, especially Paraulopus nigripinnis.
3. •
   Any New Zealand smelt (Retropinna retropinna).
4. •
   Any bivalve pearlfish (Onuxodon margaritiferae).