Stigmatogobius sadanundio (Hamilton, 1822)

Body Coloration

This gray-blue fish has two dorsal fins.

First Dorsal Fin Features

The first dorsal fin has approximately six stiffly held rays, and it often bears a black blotch.

Second Dorsal Fin Structure

The second dorsal fin is equal in length to the long-based anal fin.

Dorsal Fin Markings

Both of the dorsal fins carry dark spots.

Maximum Size

This species can reach a maximum length of 9 centimetres (3.5 inches) in standard length (SL).