Yellow-eyed mullet shoal by size. Smaller fish like this one just 60mm in length can be found in huge shoals over the summer around river mouths and along the coast.
Yellow-eyed Mullet – Aldrichetta forsteri – found in harbours, estuaries, tidal rivers

Yellow-eyed Mullet – How to Catch them for Bait Yellow-eyed mullet are often incorrectly called.