ljuska

1. (of an egg, nut, onion) shell; husk; skin
   Ljuske od jaja baci u kantu za otpad. — Throw the eggshells in the trash can.
   Na stolu su ostale ljuske od semenki. — Sunflower seed husks were left on the table.
2. (of fish, reptiles) scale
   Prvo očisti ribu od ljuski, pa je operi. — First scale the fish, then wash it.

For fish scales krljušt is also common; for eggshell kora is also used.