What Do Fish Scales Look Like

In bony fish, fish scales are broadly classified into the following types:

  • Cycloid scales – these scales are uniform and have a smooth texture. The outer edge of these scales are usually smooth.

  • Ctenoid scales – these scales are almost similar to cycloid scales. However, they have a unique feature called ctenii, which resemble small teeth on the outer edges of the scales.
  • Ganoid scales – ganoid scales are called so because they are covered with an enamel-like substance called ganoin. These scales are also similar to placoid scales.

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